THA conversion rate comparing decompression alone, with autologous bone graft or stem cells in osteonecrosis.

Introduction: Core decompression (CD) with or without the addition of autologous bone graft (CDBG) is currently the most widely accepted treatment for hip osteonecrosis in stages of pre-collapse. The use of bone marrow mesenchymal stem cells (CDSC) is emerging as a promising biological alternative. We sought to determine the total hip arthroplasty (THA) conversion rate for patients treated with CD, CDBG or CDSC.

Material And Methods: Between 1996 and 2012, 97 cases were evaluated in 72 patients: 47 CD cases, 34 CDGB cases and 16 CDSC cases. The mean age was 39 (20-63) years, 25 bilateral, 19 female and 53 male, 14 Ficat 1 and 83 Ficat 2. Bilateral cases with asymmetric stage and equal treatment were excluded.

Results: Conversion rate to THA was 44% for the CD group (21/47) at an average of 77 (24-324) months; 50% for the CDBG group (17/34) at an average of 34 (24-240) months and 50% for the CDSC group (8/16) at an average of 48 (24-72) months (p = 0.619). Log Rank test for survivorship analysis was not significant (p = 0.2011). Immunodeficiency or corticosteroid treatment history was associated with 16/47 of the CD group, 7/34 in the CDBG group and 1/16 in the CDSC group. Trauma was associated with 2/47 of the CD group, 5/34 of the CDBG group and none of the CDSC group. Hazard ratio considering risk factors was not significant (p = 0.252).

Conclusions: In these series of cases including patients with pre-collapse osteonecrosis, we observed non-significant results regarding rate of conversion to THA with CD, CDBG or CDSC at an average of 5.5 years.