Q1: TT Fitting & Evaluation

Question 1

Biomechanical Goal #1 for a TT prosthesis

Answer 1

maximize residual limb weight bearing capacity

Question 2

Diagnosing Socket Fit Problems

Answer 2

• patient feedback/input
• residual limb evaluation
• observational gait analysis
• prosthesis evaluation

Question 3

Volume Goals

Answer 3

• resistance during donning
• no distal end discomfort
• no pain

Question 4

Length Goals

Answer 4

• Socket MPT aligned with anatomical MPT
• appropriate distal end contact

Question 5

TT Socket Evaluation: Contours Goals

Answer 5

• pressure distribution per design
• ML stability at femoral condyles
• no pain

Question 6

Anterior TT Trimlines

Answer 6

• varies by socket design
• standard PTB = mid patella
• PTB-SCSP = 25 mm proximal to patella

Question 7

Medial/lateral TT Trimlines

Answer 7

• height is patient specific
• shorter limb length indicates higher trim lines
• standard PTB=65 mm proximal to MPT

Question 8

Posterior Wall Trimlines

Answer 8

• high enough for sagittal plane stability
• low enough for sitting comfort
• hamstring tendons relieved when sitting at rest and for sit-to-stand

Question 9

When does RL undergo substantial changes in shape and volume?

Answer 9

during post operative recovery (12-18 months post-op)

Question 10

Long Term Residual Limb Changes

Answer 10

• weight gain or loss
• muscle atrophy or muscle gain
• children (bone growth, increase in girth)

Question 11

Short Term Residual Limb Changes

Answer 11

• Comorbidities
• activity level
• ambient conditions
• dietary habits
• menstrual cycle
• edema
• dialysis