WK7: Elbow and Shoulder Joint

Question 1

Internal Locking Elbow

Elbow Components

Answer 1

• Turntable allows passive internal/external rotation
• Lock control cable can be routed inside or outside turntable

Hosmer E-400 = standard adult

Question 2

Outside Locking Hinges

Elbow Components

Answer 2

• for long residual limbs (WD)
• adding internal locking elbow will make joint center too distal

Question 3

Internal Locking Elbow Sizes

Answer 3

• E-50: Small Adult Pediatric
• E-200: Medium Adult
• E-400: Large Adult

Question 4

Nudge Spring

Internal Locking Elbow

Answer 4

• often for short residual limbs
• Difficult to achieve enough force to lift forearm segment of px

Question 5

Turntable Placement

Coronal Alignment Line

Answer 5

• 25 mm of clearance from the widest part of the body
• determines medial border of elbow turntable

Question 6

Turntable Placement

Sagittal Alignment Line

Answer 6

• bisect long axis of limb
• determines lateral midline of elbow

Question 7

Bulkhead

Shoulder Components

Answer 7

• No capability to move at shoulder level
• for stability only

Question 8

Abduction

Shoulder Components

Answer 8

• single axis

Question 9

Flexion-Abduction

Shoulder Components

Answer 9

• two planes
• laminated into socket

Question 10

Spring Lift Assist

Answer 10

• provides elbow flexion assistance to the user by use of an internal spring mechanism
• reduces fatigue with frequent operation