After a total hip arthroplasty using a postero-lateral approach, how should the patient's leg be positioned?

Positioning the patient's leg after a total hip arthroplasty using a postero-lateral approach is crucial for preventing dislocation and ensuring optimal recovery. The choice of external rotation and abduction is correct because it aligns with the surgical goals of minimizing tension on the hip joint and promoting stability.

In a postero-lateral approach, the muscles and soft tissues surrounding the hip have undergone manipulation. By positioning the leg in external rotation and abduction, it helps to create a stable configuration that reduces the risk of the femoral head dislocating from the acetabulum, especially during the initial healing phases when the surrounding structures are still compromised.

Maintaining this positioning allows for better alignment of the joint surfaces and facilitates normal hip mechanics, which are essential for rehabilitation. Additionally, this position aids in accommodating the post-surgical anatomy, considering that there may be some swelling and inflammation around the hip joint.

Other positioning alternatives, such as internal rotation and adduction, hyperextension, or a neutral position, do not support the recommended precautions against dislocation and may introduce risks of impingement or pressure concerns on the surgical site.