For an anterior hip replacement incision, which motion should be avoided?

• A. Hip flexion beyond 90 degrees
• B. Hip abduction
• C. Hip extension and external rotation
• D. Internal rotation

Answer: (C)

For an anterior hip replacement, the main precaution is to avoid extending the hip while it is externally rotated. Extending the hip with the leg turned outward places the femoral head against the front of the socket and can cause an anterior dislocation of the joint, especially in the early healing period. That’s why “extension and external rotation” is the motion to avoid.

Flexing the hip beyond 90 degrees is more commonly emphasized as a restriction with other approaches, while abduction and internal rotation are generally safer early on with an anterior approach. Always follow the surgeon’s specific precautions, but the combination of extension with external rotation is the key risk to avoid.