In a conventional quadrilateral socket for a transfemoral (above-knee) prosthesis, the primary weight-bearing structure is the:

• A Greater trochanter
• B Ischial tuberosity ✓
• C Pubic ramus
• D Gluteal region

Explanation

In the classic quadrilateral transfemoral socket, body weight is transmitted mainly through the ischial tuberosity, which rests on the posterior brim of the socket. The adductor group sits in the medial wall and the femur is held in slight adduction. Newer designs such as the ischial containment socket enclose the ischium within the socket, but even these rely on the same bony point as the key load-bearing landmark.

Reference: Maheshwari's Essential Orthopaedics, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.