Notes
Slide Show
Outline
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WORK-RELATED
MUSCULO-SKELETAL DISORDERS
(WRMSD):
 
Overview & Epidemiology
Clinical & Compensation aspects
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Overview
  • OVERVIEW & EPIDEMIOLOGY
  • History
  • Legal Definitions
  • Models of causation
  • Risk factors
  • CLINICAL & COMPENSATION ASPECTS
  • Classification
  • Specific clinical conditions
  • Compensation
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OVERVIEW & EPIDEMIOLOGY

  • History
  • Legal Definitions
  • Models of causation
  • Risk factors


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The most important skill you need…
  • COMMON SENSE
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Case study:
Clinical signs
  • Crepitus (crackling sound in subcutaneous tissue)
  • Muscle spasm
  • Muscle weakness
  • Reduction of range movement
  • Swelling
  • Tender trigger points in muscles
  • Tenderness
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Case study:
Progression of disease I
  • STAGE 1


  • Pain, aching & tiredness of limb during work
  • Improve overnight
  • Most often reversible with rest alone
  • Sometimes guided exercise and treatment is required
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Case study:
Progression of disease II
  • STAGE 2


  • Recurrent pain, aching and tiredness earlier in day
  • Persist at night and may disturb sleep
  • Physical signs (e.g. swelling) may be visible
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Case study:
State progression of disease III
  • STAGE 3


  • Persistent pain, aching, weakness and fatigue even if not been working for some time
  • Sleep is often disturbed
  • This can be irreversible if it is not treated appropriately
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So what….
  • De Quervain’s syndrome and Carpal Tunnel Syndromes were diagnosed during the past 2 years
  • She received steroid injections into the relevant tendon sheaths
  • Twice surgery
  • Only little improvement
  • And now it is “all in the mind”…


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Stupid…
  • R40,000 later (pain & suffering & loss of income excluded)
  • Nobody ever asked her “WHAT ARE YOU DOING AT WORK?” …
  • !!!@#$%^&*()!@#$%^&&?!!!
  • Typical doctor / specialist …???!!!
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WHO Definition of work-related musculoskeletal disorders 1:
  • Results from a number of factors
    • where the work environment and the performance of the work contribute significantly, but in varying magnitude, to the causation of the disease.
  • Some of the disorders have well defined signs and symptoms
    • E.g. rotator cuff tendinitis, carpal tunnel syndrome and acute prolapsed inter-vertebral disc.
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WHO Definition of work-related musculoskeletal disorders 2:
  • Many others are less well defined:
    • E.g. myalgic conditions involving pain, discomfort, numbness and tingling sensations throughout the neck shoulders, upper limbs and lower back.
    • These types of disorder, that are sometimes called non-specific WMSDs, often cannot be diagnosed with respect to a clinical pathology but they may still result in physical impairment and disability.

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WHO Definition of work-related musculoskeletal disorders 3:
  • WMSDs therefore, cover a wide range of inflammatory and degenerative diseases of the locomotor system. They include:
    • Inflammations / degenerations of tendons (tendinosis, tendinitis and tenosynovitis), especially in the forearm-wrist, elbow and shoulder, evident in occupations involving prolonged periods of repetitive and static work;
    • myalgias, i.e. pain and functional impairments of muscles, occurring predominantly in the shoulder-neck region, that occur in occupations with large static-work demands;
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WHO Definition of work-related musculoskeletal disorders 4:
    • compression of nerves – entrapment syndromes – occurring especially in the wrist and forearm;
    • degenerative disorders occurring in the spine, usually in the neck or lower back, especially in those performing manual handling or heavy physical work. However, they may also occur in the hip or knee joints.
  • These disorders are chronic, and symptoms usually occur only after exposure to work-related risk factors for a period of time.


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Draft amendment of Schedule 3 of COID Act (130 0f 1993) – 7 Nov 2003
  • 2.3. Occupational musculo-skeletal disorders


    • 2.3.1 Musculo-skeletal diseases caused by specific work activities or work environment where particular risk factors are present. Examples of such activities or environment include:


      • (a) rapid or repetitive motion
      • (b) forceful exertion
      • (c) excessive mechanical force concentration
      • (d) awkward or non-neutral postures
      • (e) vibration
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Definition: Work-related Upper Limb Disorder (WRULDs) (CI 180)
  • WRULDs is a collective term for a group of occupational diseases that consist of musculo-skeletal disorders caused by exposure in the workplace affecting tissues (muscles, tendons, nerves, blood vessels, joints and bursas) of the hand, wrist, arm and shoulder.
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Historical Perspective
Alternative Names
  • Repetitive Strain Injury (RSI) – Australia
  • Cumulative Trauma Disorder (CTD) – USA
  • Occupational Cervicobrachial Disorder – Japan & Sweden
  • Work-related upper limb disorder (WRULD) – E.U.
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Historical Perspective I
  • Not a new problem
  • 1713: Ramazzini – serious disease caused violent and irregular motions and unnatural postures of the body".
  • Scrivener's Palsy – incessant driving of pewn over paper causes intense fatigue of hand & arm because of continuous strain of the muscles & tendons
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Historical Perspective II
  • 1830s: Sir Charles Bell
    • writer’s cramp in male clerks in British Civil Service
    • steel nibs vs goose-quill pens
  • Late 19th Century:
    • musicians, telegraphists, cowherds, hammersmiths, seamstresses, bricklayers, etc.
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Historical Perspective III
  • Telegraphist’s cramp
  • Hop picker’s gout
  • Fisherwoman’s finger
  • Upholsterer’s hand
  • Gamekeeper’s thumb
  • Cotton-twister’s hand
  • Tennis elbow
  • Pizza-cutter’s wrist
  • Nintendonitis (Nintendo® play station – ‘computer game wrist’ in children)
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Historical Perspective IV
OCD Epidemic (Japan) 1960 - 1980
  • Keypunch operators 16-28%
  • Typists 13%
  • Cash register operators 11-16%
  • Packing machine operators 12%
  • Assembly line workers 16%
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Historical Perspective V
1964 Ministry of Labour Guidelines (Japan)
  • Work maximum of 5 hours/day
  • Take 10 minutes rest / hour
  • Do less than 40,000 keystrokes / day
  • Job Rotation
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Historical Perspective VI
Mid 1980’s – Australian RSI Epidemic
  • Data processors g all screen-based operators
    • 1978/9 = 762 cases
    • 1981/2 = 2263 cases (h 297%)
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Historical Perspective VII
Telecom Australia 1981 - 1985
  • 90,000 employees
    • 3976 cases of RSI
  • Cost
    • $15,5 million
    • $1,8 million medical cost
    • (excluding common law claims)
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Historical Perspective VIII
RSI Definition
  • Collective term - range of conditions characterised by discomfort or persistent pain in muscles, tendons and other soft tissues, with or without physical manifestations
  • Usually caused or aggravated by work, thought to be associated with repetitive movements, sustained or constrained postures and/or forceful movements
  • Psychosocial factors, including stress in the working environment, may be important in the development of RSI
  • National Occupational Health & Safety Commission (1986)
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Historical Perspective IX
Who developed RSI?
  • Young (±40 years)
  • Women with children at home
  • Stomach-related stress conditions
  • Smokers
  • Progressive glasses and/or bifocals
  • Did not exercise
  • Poor social conditions
  • Monotonous work
  • Lack of job control
  • Recent increase in workload
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Historical Perspective XI
RSI controversy
  • A psychosomatic symptom complex
    (epidemic of mass hysteria)


  • Socio-political phenomenon
    vs.
    medical condition
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Historical Perspective XIII
Supreme Court of Australia
  • Cooper vs. Commonwealth (1987)
    • Employer not guilty of negligence
    • Plaintiff had no injury
    • Awarded all costs against the plaintiff
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Historical Perspective XIV
Australian Hand Surgery Society Resolution (1985)
  • RSI = an occupational neurosis
  • Not associated with localised pathology
  • Reversible with normal use
  • No residual, permanent disability


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WRULDs – Historical Perspective XV
Medical Journal of Australia (1986)
  • Editorial decision to publish articles that emphasised the non-physical nature of RSI
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Historical Perspective XVI
CTD Epidemic in USA (1990s)
  • Vague definition
  • Epidemic spread
  • Treatment unsuccessful
  • Self-employed unaffected
  • Repetitive, monotonous tasks
  • Low job satisfaction
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Historical Perspective XVII
WRULD – UK & Europe
  • Regional Pain Syndrome


  • Work-related and non-occupational risk factors


    • E.g. carpal tunnel syndrome
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Cost of WRULDs II
European Union
  • WRULDs cost
    • Nordic Countries –0,5% GNP
    • Netherlands – 2% GNP
    • UK £1.25 billion per year
    • Sources:
    • HSE (1996)
    • EU Agency for Safety & Health at work (1990)
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Cost of WRULDs III
South Africa
  • Limited data – need research
  • WRULDs expected to be higher than industrially developed countries – h excessive physical demands made on workers
  • SAMOSA (SA Musculoskeletal
    Surveillance Action
    Group)
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Cost of WRULDs IV
Direct & indirect costs
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WRMSD - Models of causation 1
  • 1. Biomechanical
    • Excessive loads, force, repetition
    • Abnormal postures
      • ê
    • Compression. Ischaemia. Microtears. Muscle fatigue. Metabolic changes. Inflammation.
  • 2. Psychosocial
    • Somatising disorders (e.g. work stress, depression)
    • Industrial relations conflict
      • changing nature of work
      • medicalised via workers' compensation
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WRMSD - Models of causation 2
  • 3. latropenic-(Hadler)
    • High background rate of aches and pains
    • Misattribution to work as primary cause
  • 4. Technological
  • Automation, specialisation, electronic data processing


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WRULDs - Risk Factors 1
  • WRULDs are caused, aggravated or precipitated by one or more of the following risk factors, singly or in combination:
  • Task-related factors
    • highly repetitive upper limb movements
    • awkward and/or static working postures
    • Movements at the extremes of reach
    • Contact stress (e.g. uncomfortable gripping and twisting, sharp edges to hand tools, desk edges, etc.)
    • high force requirements
    • duration of exposure to tasks
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WRULDs - Risk Factors 2
    • Environmental-related factors
    • Vibration
    • Low temperatures (Cold)
    • Lighting
    • Work organisation (e.g. rotation, hours, shifts, high task pressure, conveyor belt))

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WRULDs - Risk Factors 3
Psychosocial factors 1

  • Job dissatisfaction: +
  • Monotonous work: ++
  • Perceived intensified work load: ++
  • Lack of job control: ++
  • Lack of job clarity: ++
  • Job stress leading to excessive pressure such as high job demands, time pressures and lack of control;
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WRULDs - Risk Factors 4
Psychosocial factors 2
  • Depression / burn out / affirmative action
  • Lack of social support from supervisors or co-workers;
  • tasks requiring high levels of attention and concentration are related to increased muscle tension, changing thresholds for the perception of pain and fatigue.
  • “compensitis”


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WRULDs - Risk Factors 5
  • Individual differences
  • All individuals are different and for biological reasons there may be some people who are more or less likely to develop an WRULDS.
  • Individual differences may also have implications for employees reporting WRULDS type conditions.
  • Genetic predisposition
  • new employees - time to acquire the necessary work skills and/or rate of work;
  • difference in competence and skills;


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WRULDs - Risk Factors 6
Individual differences cont…
  • Anthropometry - workers of varying body sizes, ie height, reach etc.;
  • vulnerable groups, eg older, younger workers and new or expectant mothers;
  • Gender
  • health status and disability;
  • individual attitudes or characteristics that may affect compliance with safe working practices or reporting of symptoms .
  • Smoking: Some association with LBP
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LOWER BACK PAIN -RISK FACTORS Occupational

  • Heavy manual labour
  • Lifting, twisting, awkward motions
  • Sitting
  • Driving, whole body vibration
  • Shorter duration of employment
  • ? Psychosocial: monotonous work, low motivation, lower rating by supervisor




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LOWER BACK PAIN -RISK FACTORS Non-occupational
  • Smoking
  • Taller
  • More births
  • Heavy alcohol



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Work-relatedness of MSD:
Physical work risk factors 1
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Work-relatedness of MSD:
Physical work risk factors 2
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Work-relatedness of MSD:
Physical work risk factors 3
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Work-relatedness of MSD:
Physical work risk factors 4
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Work-relatedness of MSD:
Physical work risk factors 5
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Work-relatedness of MSD:
Physical work risk factors 6
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CLINICAL &
COMPENSATION ASPECTS

  • Classification
  • Specific clinical conditions
  • Compensation


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Classification
Types of WRULDS 1
  • TYPE 1
  • Well-defined musculo-skeletal conditions & nerve entrapment syndromes affecting the upper limbs
  • Carpal Tunnel Syndrome, De Quervain’s
  • Relatively clear cut characteristics & established treatment methods


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Classification
Types of WRULDS 2
  • TYPE 2
  • Regional Pain Syndrome
  • Widespread dissemination of symptoms between neck & hand
  • Regional allodynia & hyperalgesia g neural sensitisation & pain



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Classification
According to affect on specific tissue

  • Tendon-related disorders
  • Nerve-related disorders
  • Bursa-related disorders
  • Blood vessel disorders
  • Other
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Classification
Tendon-related disorders I
  • Tendonitis
    • Confusion with terminology
    • Rare condition
    • Inflammation of tendon & tendon muscle
    • (e.g. Achilles tendon in conjunction with tendinosis)
    • Promote collagen production & reduce paratendon inflammation
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Classification
Tendon-related disorders II
  • Tendinosis - common
    • Sports Medicine
    • Intratendinous collagen degeneration due to
      • Aging
      • Microtrauma (chronic overuse repetitive movements)
      • Vascular compromise
    • Examples:
      •  epicondylitis, rotator cuff syndrome

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Classification
Tendon-related disorders III
  • Treatment of tendinosis
    • Combat collagen breakdown
    • Relative rest for reasonable period
    • Strengthening and graduated loading of tendon (eccentric)
    • Facilitate collagen production & maturation gnormal strength
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Classification
Tendon-related disorders IV
  • Tenosynovitis
    • Rapid repetitive movements especially of hands and fingers g
      • Inflammation of synovial lining of the tendon sheath g
      • swelling g pain g
      • restricted movement of tendon in sheath
    • Repeated exposure g hscar tissue g h pain g imobility g istrength
    • Examples:
      • Trigger Finger, De Quervain’s
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Classification
Nerve-Related Disorders I
  • Nerves need to undergo mechanical changes (compression, elongation, cross-sectional changes, etc.) for normal functioning
  • â mechanical changes g physiological changes (âaxoplasmic flow, etc.)
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Classification
Nerve-Related Disorders II
  • Dysfunctional nerve g
    • Pain
    • Paraesthesia
    • Sensory changes
    • in areas supplied by nerve

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Classification
Nerve-Related Disorders III
  • Carpal Tunnel Syndrome
  • Pronator Teres Syndrome
  • Cubital Tunnel Syndrome
  • Guyon tunnel Syndrome
  • Radial Tunnel Syndrome
  • Anterior Interosseous Nerve Syndrome
  • Posterior Interosseous Nerve Entrapment, etc.
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Classification
Bursa-related disorders
  • Fluid-filled sacks that protect muscles, tendons & skin from friction against bones during joint movement
  • Overexertion g inflammation (bursitis) g swelling & dull, aching pain
  • Examples:
    • Olecranon bursitis (beat elbow)
    • Subacromial burisits
    • Subdeltoid bursitis
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Classification
Blood-vessel disorders
  • Usually due to vibration or hammering g vasospasm & i circulation
  • Excessive exposure g i circulation + neurological findings (i motor function of hand and arm)
  • Examples:
    • Raynaud’s Phenomenon
    • Hand Arm Vibration Syndrome
    • Hypothenar Hammer Syndrome
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Classification
Other Disorders
  • Effect on muscles and joints
    •  Problematic to prove objectively
    • Controversial
  • Static loading
    • Occurs proximally when repetitive movement occurs distally
    • Static loading g muscle imbalances & trigger points g pain
    • Examples:
      • Tension neck syndrome, myalgia, strains, etc.
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Shoulder
Rotator Cuff Syndrome I
  • Bicipital tendinosis
  • Infraspinatus tendinosis
  • Partial tear of the rotator cuff
  • Subacromial bursitis
  • Subdeltoid bursitis
  • Subscapularis tendinosis
  • Supraspinatus tendinosis
  • Tendinosis of the shoulder
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Shoulder
Rotator Cuff Syndrome II
  • Executing repetitive overhead movements, static loading and/or sustained postures.
  • Prone to develop bursal side tears secondary to impingement
  • Sign of rotator cuff lesions = pain exacerbated by abduction against resistance.


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Shoulder
Rotator Cuff Syndrome III
  • Limited by pain towards the end of the active range of movement
  • Passive range of motion ± normal
  • Acute rotator cuff tendinosis ≤12 weeks duration.
  • Chronic rotator cuff rupture = marked difficulty initiating abduction with weakness and limitation of movement
  • “painful arc” -  70o to 120o  abduction
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Shoulder
Job activities and tasks typically associated with rotator cuff syndrome
  • Belt conveyor assembly
  • Carrying load on shoulders
  • Construction work
  • Electrical work
  • Lifting
  • Overhead assembly
  • Overhead painting
  • Overhead welding
  • Packing
  • Punch press operation
  • Reaching
  • Work with the arms away from the body
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Shoulder
Other work-related shoulder conditions

  • Rupture of the long head of the biceps
  • Pectoralis major strains
  • Levator scapulae syndrome
  • Fractures around the shoulder joint.


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Elbow
Lateral Epicondylitis I
  • “Tennis Elbow” -
    Pain at epicondyle
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Elbow
Lateral Epicondylitis II
  • Often starts as an acute direct injury to the site of the muscle origin which progresses to an epicondylitis
  • Work action:
    • Unusual forces (power grasp),
    • Repetition
    • Forceful gripping
    • Repeated supination and pronation.

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Elbow
Medial Epicondylitis (“Golfer’s Elbow”)
  • Overuse of
    • finger flexors
    • wrist flexors / pronators
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Elbow
Cubital Tunnel Syndrome
  • Resting forearm near elbow on a hard surface
  • Resting forearm near elbow on sharp edge
  • Resting forearm near elbow while reaching over obstruction
  • Repetitive or static elbow flexion
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Forearm, Wrist & Fingers
 De Quervain’s Tenosynovitis I

  • Stenosing tenosynovitis of the abductor pollices longus and extensor pollices brevis tendons
  • Tendons of the forearm are stretched and rub against the radial styloid g inflammation of tendon sheath
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Forearm, Wrist & Fingers
De Quervain’s Tenosynovitis II
  • Presents with pain & localised swelling over styloid process of radius
  • Common variant : localised swelling at base of the thumb & thickening of fibrous sheath (extensor retinaculum).
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Forearm, Wrist & Fingers
De Quervain’s Tenosynovitis III
  • De Quervain’s can results from overuse of the thumb
    • such as in the repetitive grasping of a straight handled tool
    • (e.g. screwdriver, endo files of dentist).
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Forearm, Wrist & Fingers
De Quervain’s Tenosynovitis IV
  • Diagnostic criteria
  • Pain and tenderness localised to the radial aspect of the wrist
  • PLUS positive Finkelsteins's test
  • Sometimes a palpable nodule in course of  Abd. pollicis longus & Ext. pollicis brevis.
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Forearm, Wrist & Fingers
De Quervain’s Tenosynovitis V
  • Differential Diagnoses
  • Degenerative arthritis of trapeziometacarpal joint
    • Grind Test
      • Painful in degenerative arthritis
      • No, little pain in De Quervain's
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Forearm, Wrist & Fingers
De Quervain’s Tenosynovitis VI
  • Differential Diagnoses
  • Degenerative arthritis of trapeziometacarpal joint
  • Post-partum women
  • Intersection Syndrome
  • Wartenberg's Syndrome
    • Radial sensory nerve entrapment causing significant pain in the lower third of the forearm
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Forearm, Wrist & Fingers
Trigger Finger / Thumb I
  • Stenosing tenosynovitis and/or tendinosis of flexor tendons
  • Inability to move fingers or thumb smoothly
  • Locking of affected digit, with or without pain.
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Forearm, Wrist & Fingers
Trigger Finger / Thumb II
  • Hand tools that have sharp edges pressing into the tissue
  • Hand tools whose handles are too far apart for user.
  • Repetitive movements with repeated or prolonged gripping or pinching can also cause operating trigger finger.
  • Investigate concomitant diseases
    and/or other reasons for trigger finger
    • rheumatoid arthritis
    • diabetes, etc.
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Forearm, Wrist & Fingers
Carpal Tunnel Syndrome I
  • Condition which results from direct or indirect pressure on nerves
  • Common ailment affecting the wrist and hand
  • Majority of cases not caused by work
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Forearm, Wrist & Fingers
Carpal Tunnel Syndrome II
  • Specific occupations where wrists are in abnormal positions for prolonged periods with highly repetitive movements
    • â
  • Tenosynovitis of flexor tendons
    • â
  • Pressure on the median nerve in the carpal tunnel


  • Buffing
  • Grinding
  • Prehensile task especially in extremes of flexion, extension and ulnar deviation
  • Assembly work
  • Typing
  • Packing
  • Scrubbing
  • Hammering
  • Repetitive or forceful grip
  • VDT work
  • Polishing
  • Sanding
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Forearm, Wrist & Fingers
Carpal Tunnel Syndrome III
  • SYMPTOMS
  • Symptoms start with a gradual onset of
    • tingling and numbness in the fingers
  • Can progress to
    • pain
    • Clumsiness
    • muscle atrophy in the hand.
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Forearm, Wrist & Fingers
Carpal Tunnel Syndrome IV
  • CLINICAL DIAGNOSIS
  • Positive Tinel’s Sign
    • pain, numbness, or tingling in the median nerve distribution resulting from tapping over the proximal wrist crease
  • PLUS
  • Positive Phalen’s sign or reverse Phalen’s sign
    • pain, numbness, or tingling in the median nerve distribution resulting from complete palmar flexion and dorsiflexion respectively, of the wrist for 60 seconds
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Forearm, Wrist & Fingers
Carpal Tunnel Syndrome V
  • CARPAL TUNNEL AS INJURY
  • Direct injury to the wrist area
    • Acutely
      • haematoma g pressure on the nerve
    • More sub acutely
      • like a fracture g swelling / deformity.
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Forearm, Wrist & Fingers
Flexor/Extensor
tendinosis/tenosynovitis
  • Punch press operation
  • Assembly work
  • Wiring
  • Packaging
  • Use of pliers
  • Buffing
  • Grinding
  • Polishing


  • Sanding
  • Punch press operation
  • Sawing
  • Cutting
  • Use of pliers
  • “Turning” controls such as on motorcycle
  • Inserting screws in holes
  • Forceful hand wringing
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Forearm, Wrist & Fingers
Other work-related hand and wrist conditions
  • Radial Tunnel Syndrome
  • Guyon (Ulnar) Tunnel Syndrome
  • Pronator Teres Syndrome
  • Anterior & posterior Interosseous Syndrome
  • Intersection Syndrome.
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Diagnosis
Principles of diagnosis I
  • Medical assessment
    • Medical history
      • The employee’s current medical history:
      • site and distribution of the symptoms
      • quality (type, character)
      • severity (intensity, frequency, duration)
      • progression of the symptoms.
    • Physical examination
    • Special investigations
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Diagnosis
Principles of diagnosis II
  • Functional capacity evaluation
    • E.g. the employee is able to type, but develops symptoms after continuous typing for 30 minutes.)
    • This might be simple and straightforward …
    • in complicated cases a formal occupational therapy and / or physiotherapy assessment
  • Job analysis / Ergonomic assessment
    • Assess the employee’s working environment(s) for human and environmental risk factors.
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Diagnosis
Symptoms
  • Burning sensation
  • Fatiguability
  • Loss of grip strength
  • Loss of normal sensation
  • Muscle spasm
  • Muscle weakness
  • Pain
  • Paraesthesia (tingling)
  • Sensation of cold
  • Swelling
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Diagnosis
Clinical signs
  • Crepitus (crackling sound in subcutaneous tissue)
  • Muscle spasm
  • Muscle weakness
  • Reduction of range movement
  • Swelling
  • Tender trigger points in muscles
  • Tenderness
99
Diagnosis
PLEASE NOTE THAT…
  • Symptoms may not always be accompanied by objective signs
  • Any one symptom or sign is not indicative of WRULDs and some may be common with normal function
  • Very few sufferers experience all the symptoms
  • The symptoms do not appear in any particular order


100
Diagnosis
State progression of disease I
  • STAGE 1


  • Pain, aching & tiredness of limb during work
  • Improve overnight
  • Most often reversible with rest alone
  • Sometimes guided exercise and treatment is required
101
Diagnosis
State progression of disease II
  • STAGE 2


  • Recurrent pain, aching and tiredness earlier in day
  • Persist at night and may disturb sleep
  • Physical signs (e.g. swelling) may be visible
  • Refer for physiotherapy and ergonomic assessment to prevent recurrence
102
Diagnosis
State progression of disease III
  • STAGE 3


  • Persistent pain, aching, weakness and fatigue even if not been working for some time
  • Sleep is often disturbed
  • This can be irreversible if it is not treated appropriately
103
Diagnosis
History of occupational exposure I
  • Require summary of
    • work environment
    • work process
    • work actions
    • If necessary, photos, diagrams and/or extra reports to explain the employee’s work actions may be very helpful
104
Diagnosis
History of occupational exposure I
  • RISK FACTORS
  • Repetitive actions with short cycles
  • Forceful movements
  • Static loading of muscles
  • Any postures held for a long time, especially awkward postures.
  • Forceful gripping and twisting
  • Poor work organisation – low level of control over work rate and no breaks
105
Diagnosis
History of occupational exposure II
  • RISK FACTORS
  • Psychosocial stress at work and fatigue
  • Cold environment or handling chilled or frozen products
  • Vibration
  • Overhead working postures or jobs with minimal movement and non-optimal sustained postures.
  • High-risk jobs - Combination of repetitive, forceful movements, awkward postures, static loading


106
Diagnosis
Special investigations
  • Perform special investigations
    • if it is essential for the accurate diagnosis and treatment of the disorder
    • to investigate and eliminate other causes
  • Examples
    • X-rays
    • strength testing
    • range of motion testing
    • electromyography (EMG) analysis
    • isokinetic dynamometry
  • Get  prior authorisation for MRI scans
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Treatment
Employee Education
  • OHP: explain pathology of tendinosis
  • Most vulnerable employees
      • Those with symptoms of short duration and still able to work
      • Should they continue without Rx g exacerbate condition
108
Treatment
Anti-inflammatory Strategies
  • Cryotherapy (ice)
  • Electrotherapeutic modalities (Physiotherapy)
  • Non-steroid anti-inflammatory drugs (e.g. Voltaren)
  • Infiltration with corticosteroids
    • Inhibits collagen repair g avoid


109
Treatment
Biokinetic and ergonomic strategies I

  • Initial treatment may include rest
  • Compression and elevation
  • Temporary job change



110
Treatment
Biokinetic and ergonomic strategies II
  • Biomechanical deloading
    • Collagen degeneration & mechanical overload g tendinosis
    • Mechanical overload due to
      • Work environment
      • Work tasks (repetition, force, posture, vibration, etc.)
      • Individual biomechanics (trigger points, muscle imbalances)
    • Correct biomechanics
      • Movement patterns
      • muscle imbalances
      • Equipment used / environment
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Treatment
Biokinetic and ergonomic strategies III
  • Immobilise – Splintage (occupational therapy)
  • Load-decreasing devices
    • imechanical load on collagen
      • Splints
      • Braces
      • Supports
    • Examples
      • Tenosynovitis of forearm, wrist, fingers, etc.
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Treatment
Biokinetic and ergonomic strategies IV
  • Mobilise – manual therapy (physiotherapy)
  • Mobilise – exercise therapy to appropriately strengthen the tendons and muscles.
    • Graded loading of tendon g improved collagen alignment & cross linkage g improved strength
    • Eccentric training drills g stimulate mechanoreceptors in tenocytes g hcollagen production
    • Collagen production key to tendinosis recovery
  • Re-introduction to the workplace (Work hardening and ergonomics adjustments)
113
Treatment
Psychology & Surgery
  • Pscychological evaluation
  • Surgery
    • where indicated as last resort




114
Treatment
Coordinated effort
  • Interaction with the therapist
    • OMP, OHN, employee, employer, physiotherapist, occupational therapist, biokinethesist, ergonomist, medical specialist g
      • Similar understanding of tendinosis pathology
      • Coordinated approach
      • Realistic time frame for rehab
        (months, not weeks)
        • Short duration symptoms ~ resolve fully in 2-3 months
        • Chronic symptoms ~  4-6 months
115
Treatment
 Algorithms
  • For the OHN as primary contact
  • For the OMP to work up the case
  • Reporting to the Compensation Commissioner (OMP)
  • Reporting to Dept Labour / DME (Employer)
116
Compensation of WRULDs
  • A reportable occupational disease to the
    • Compensation Commissioner
    • Inspectorate of the nearest Dept of
      • Labour
      • Minerals and Energy
  • An occupational medicine practitioner should preferably do the notification.
117
Circular Instruction 180
Occupational Disease
vs. Occupational Injury

  • Occupational Disease = WRULD caused by repetitive movements (¹ injury )
  • Occupational Injury = Complication of initial occupational injury
    • Example: Fracture of the forearm Ú
    • Tenosynovitis (because no work hardening)
    • Here WRULD should be reported to Compensation Commissioner on the Progress Medical Reports i.t.o. occupational injury.
118
Circular Instruction 180
Compensation & Prevention
(COIDA & OHSA/MHSA)
  • Report to the Compensation Commissioner so that payment of medical costs, sick leave and compensation could be considered in terms of the COID Act.
  • Prevention: Report to Provincial Executive Manager of Labour / Regional Principal Inspector of Mines
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Reporting to the Compensation Commissioner 1
  • W. Cl. 1
    • Employer’s Report of an Occupational Disease
  • W. Cl. 14
    • Notice of an Occupational Disease and Claim for Compensation
  • W. Cl. 110
    • Occupational Exposure
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Reporting to the Compensation Commissioner 2
  • W. Cl. 301
    • First Medical Report in respect of a Work-Related Upper Limb Disorder (WRULD)
    • W. Cl. 301 must be used instead of the usual W. Cl. 22
  • All other reports that may be relevant
121
Reporting to the Compensation Commissioner 3
  • W. Cl. 6
    • Monthly Resumption Report
  • W. Cl. 302
    • Progress/Final Medical Report in respect of a Work-Related Upper Limb Disorder (WRULD)
    • Progress medical reports - monthly
    • W. Cl. 302 must be used instead of the usual W. Cl. 26

122
Evaluation of Impairment
  • Description of residual impairment by the treating doctor (W. Cl. 302)
  • Most employees will recover and return to work
  • only a small percentage will suffer any permanent residual impairment.
123
Permanent impairment will be assessed after (I):
  • Medical treatment
  • Vocational rehabilitation, which includes
    • Optimising the person’s functional ability through rehabilitation that includes work hardening, work conditioning, etc.


124
Permanent impairment will be assessed after (II):
    • Addressing problem areas identified in the job analysis / ergonomic assessment by allowing alterations in the way in which work is performed through reasonable accommodation:
      • workplace environment adaptation
      • tool and equipment adaptation
      • workstation redesign
      • job task modification
      • retraining and reassignment
      • work schedule modifications
125
Reporting to Labour / DME
126
Reporting to Labour / DME
127
Reporting to Labour / DME
128