A transfemoral amputee walking with his prosthesis deviates by leaning his trunk laterally toward the amputated side during the stance phase of that limb. Which is the most common cause of this gait deviation?

• A Weak hip abductors of the residual limb ✓
• B Knee unit set in excessive extension
• C Prosthetic foot set in excessive dorsiflexion
• D Excessive initial flexion of the prosthetic knee

Explanation

Lateral trunk bending toward the amputated side during prosthetic stance shifts the centre of gravity over the hip to compensate for weak hip abductors or a short residual limb with a reduced lever arm, preventing pelvic drop on the opposite side. Excessive knee flexion or a long prosthesis produces vaulting or circumduction instead. The prosthetic knee and ankle settings listed affect other deviations such as knee instability.

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

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Written and medically reviewed by the StethoPrep medical team.