The ideal length of the residual limb (stump) for a below-knee (transtibial) amputation to achieve optimal prosthetic fitting and functional outcome is:

• A Maximum length — as distal as possible for greatest leverage
• B 5–7 cm below the tibial tubercle (very short stump)
• C Just at the musculotendinous junction of the gastrocnemius
• D 12–15 cm of tibia from the knee joint line (middle third of the tibia) ✓

Explanation

For transtibial amputation, the optimal residual limb length is 12–15 cm from the knee joint line (approximately the junction of upper and middle thirds of the tibia). This provides adequate lever arm for prosthetic control, sufficient soft-tissue coverage with a myofascial flap, and avoids the distal third where the anterior tibial surface is subcutaneous and difficult to pad. A stump shorter than 7 cm provides insufficient lever arm; a very distal stump has compromised soft-tissue coverage and circulatory risk.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.