The ideal level for below-knee amputation that provides the best prosthetic fitting and functional outcome is determined by which tibial remnant length?
- A Middle third of tibia (approximately 12–15 cm below tibial tuberosity) ✓
- B Tibia cut at 5 cm below the tibial tubercle
- C Syme's amputation at the ankle level
- D Long tibia stump as distal as possible, preserving any viable tissue
Explanation
The ideal transtibial (below-knee) amputation length is 12–15 cm of tibia below the tibial tuberosity (approximately middle-third level). This provides a lever arm long enough for effective prosthetic control while leaving sufficient soft tissue for a well-padded stump. A stump <5 cm is functionally equivalent to a through-knee or above-knee amputation for prosthetic fitting. An excessively long stump has poor soft tissue coverage distally and is at risk for skin breakdown. Syme's amputation (ankle disarticulation with heel pad preservation) has specific indications (diabetic/dysvascular foot) and produces an end-bearing stump but requires specialized footwear.
Reference: Maheshwari Essential Orthopaedics, 6th ed.
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Written and medically reviewed by the StethoPrep medical team.