In the patellar tendon bearing (PTB) socket used for a transtibial prosthesis, weight bearing is intentionally distributed over specific pressure-tolerant areas. Which of the following is a principal pressure-tolerant (weight-bearing) area?

• A Tibial tuberosity crest
• B Head of the fibula
• C Patellar tendon and medial tibial flare ✓
• D Distal end of the tibia

Explanation

The PTB socket loads pressure-tolerant areas: the patellar tendon, medial tibial flare, pretibial muscle mass and popliteal fossa, while relieving pressure-sensitive areas. The head and neck of the fibula are pressure-sensitive because the common peroneal nerve winds around the neck, so option B is relieved rather than loaded. Loading the distal tibial end or the subcutaneous tibial crest would cause pain and skin breakdown.

Reference: Orthotics and Prosthetics in Rehabilitation, Chui et al., 4th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.