Psy 552 Ergonomics

1
Psy 552 Ergonomics Biomechanics

• Lecture 20

2
MSDs

• A descriptor for disorders and diseases of the
  musculoskeletal system having proven or
  hypothetical work related causal components
• The concept is similar to

3
MSD Modeling

• Dose-Response
• Biomechanically
• Job design and stress model

4
MSD Information

• Progression
• Classification
• Diagnosis

5
MSD research evaluation

• Selection bias
• Response bias
• Confounding
• Misclassification bias

6
MSD research evaluation (cont.)

• Generalizability
• Sample size

7
MSD research methods

• Experiments
• Observational studies

8
Prospective cohort
9
Case-control design
10
Cross-sectional studies
11
Case-series study
12
Exposure measurements

• Bernard et al. (1994)
• Fransson-Hall et al. (1995)

13
Aspects of the MSD literature

• Association between disease and work exposure
• Temporality
• Specificity
• Consistency

14
Aspects of the MSD literature (cont.)

• Predictability
• Consistency of findings
• The NIOSH categories

15
Tendon Disorders

• Tendonitis and tenosynovitis inflammation of
  the tendon or synovial membrane of the tendon
  sheath.
• Locations

16
Peripheral nerve disorders

• Mechanical nerve entrapment

17
Tension neck syndrome

• Symptoms
• Diagnosis
• Affected population
• Prediction

18
Tension neck syndrome (cont.)

• Consistency of association
• Causal factors
• Work relatedness

19
Shoulder tendonitis

• Symptoms
• Diagnosis
• Affected population
• Prediction

20
Shoulder tendonitis (cont.)

• Consistency of association
• Causal factors
• Work relatedness

21
Epicondylitis

• Symptoms
• Diagnosis
• Affected population
• Prediction

22
Epicondylitis (cont.)

• Consistency of association
• Causal factors
• Work relatedness

23
Carpal tunnel syndrome

• Symptoms
• Diagnosis
• Affected population
• Prediction

24
Carpal tunnel syndrome (cont.)

• Consistency of association
• Causal factors
• Work relatedness

25
De Quervains tendonitis

• Symptoms
• Diagnosis
• Affected population
• Prediction

26
De Quervains tendonitis (cont.)

• Consistency of association
• Causal factors
• Work relatedness

27
Hand arm vibration syndrome

• Symptoms
• Diagnosis
• Affected population
• Prediction

28
Hand arm vibration syndrome (cont.)

• Consistency of association
• Causal factors
• Work relatedness

29
Dupuytrens contracture

• Symptoms
• Diagnosis
• Affected population
• Prediction

30
Dupuytrens contracture (cont.)

• Consistency of association
• Causal factors
• Work relatedness

31
Achilles tendonitis

• Symptoms
• Diagnosis
• Affected population
• Prediction

32
Achilles tendonitis (cont.)

• Consistency of association
• Causal factors
• Work relatedness

33
Thoracic outlet syndrome

• Symptoms
• Diagnosis
• Affected population
• Prediction

34
Thoracic outlet syndrome (cont.)

• Consistency of association
• Causal factors
• Work relatedness

35
Radiculopathy

• Symptoms
• Diagnosis
• Affected population
• Prediction

36
Radiculopathy (cont.)

• Consistency of association
• Causal factors
• Work relatedness

37
Osteoarthritis

• Symptoms
• Diagnosis
• Affected population
• Prediction

38
Osteoarthritis (cont.)

• Consistency of association
• Causal factors
• Work relatedness

39
Hypothenar hammer syndrome

• Symptoms
• Diagnosis
• Affected population
• Prediction

40
Hypothenar hammer syndrome (cont.)

• Consistency of association
• Causal factors
• Work relatedness

41
Knee bursitis

• Symptoms
• Diagnosis
• Affected population
• Prediction

42
Knee bursitis (cont.)

• Consistency of association
• Causal factors
• Work relatedness