Preventing Leg Length Discrepancy and Instability After Total Hip Arthroplasty.

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Restoring equal leg lengths and dynamic hip stability are critical for successful total hip arthroplasty (THA).
• Preoperative assessment and planning are essential to identify patients at risk for leg length discrepancy.
• Current techniques aim to improve range of motion and hip stability while reducing dislocation rates.

Purpose of the Study:

• To outline essential clinical and surgical techniques for achieving leg length equalization in THA.
• To detail methods for ensuring dynamic hip stability and reducing dislocation after THA.
• To inform surgeons about strategies for managing recurrent instability.

Main Methods:

• Preoperative patient risk identification for leg length discrepancy.
• Utilizing larger femoral heads, high-offset stems, and enhanced soft-tissue repairs.
• Employing anatomic landmarks, intraoperative imaging, calipers, stability testing, and computer-assisted surgery for accurate component positioning.

Main Results:

• Improved impingement-free range of motion and dynamic hip stability.
• Reduced rates of dislocation through optimized implant selection and surgical techniques.
• Strategies for addressing recurrent instability, including specialized liners based on abductor function.

Conclusions:

• Meticulous preoperative planning and intraoperative execution are paramount for leg length equalization and hip stability in THA.
• Advanced surgical techniques and implant choices significantly enhance functional outcomes and reduce complications.
• Addressing the root causes of instability, including appropriate liner selection, is crucial for long-term success in total hip replacement.