RESUMEN
<p><b>OBJECTIVE</b>To observe the results of total hip replacement with collum femoris preserving for the treatment of advanced stage of femoral head necrosis of youth.</p><p><b>METHODS</b>From August 2002 to November 2009, 21 patients (28 hips) with advanced stage of femoral head necrosis were treated with total hip replacement with collum femoris preserving. Sixteen males (22 hips) and 5 females (6 hips) with an average age of 36 years (range from 26 to 51 years) were included. All patients were evaluated clinically using Harris score, the prosthesis components were assessed for position, loosening, bone resorption and other conditions with radiographs.</p><p><b>RESULTS</b>Nineteen patients (26 hip) were followed up for mean 5 years and 7 months (ranging 5 years and 3 months to 7 years and 1 month), 2 patients were missed. The average Harris score increased from the preoperative average 48.5 to 90.2. The leg-length discrepancy (the difference was less than 2 cm) occurred in 3 cases. No thigh pain and revision.</p><p><b>CONCLUSION</b>Total hip arthroplasty with collum femoris preserving is one of the best choices for the treatment of advanced stage of femoral head necrosis of young patients with good midterm outcome.</p>