Long-term outcomes of transtrochanteric rotational osteotomy for non-traumatic osteonecrosis of the femoral head
- PMID: 28148658
- DOI: 10.1302/0301-620X.99B2.BJJ-2016-0417.R2
Long-term outcomes of transtrochanteric rotational osteotomy for non-traumatic osteonecrosis of the femoral head
Abstract
Aims: Transtrochanteric rotational osteotomy (TRO) is performed for young patients with non-traumatic osteonecrosis of the femoral head (ONFH) to preserve the hip. We aimed to investigate the long-term outcomes and the risk factors for failure 15 years after this procedure.
Patients and methods: This study included 95 patients (111 hips) with a mean age of 40 years (21 to 64) who underwent TRO for ONFH. The mean follow-up was 18.2 years (3 to 26). Kaplan-Meier survivorship analyses were performed with conversion to total hip arthroplasty (THA) and radiological failure due to secondary collapse of the femoral head or osteoarthritic changes as the endpoint. Multivariate analyses were performed to assess risk factors for each outcome.
Results: Survival rates at 15 years with conversion to THA and radiological failure as the endpoint were 59% (95% confidence interval (CI) 49 to 67) and 30% (95% CI 22 to 39), respectively. Necrotic type C2 ONFH (lesions extending laterally to the acetabular edge) (hazards ratio (HR) 3.9) and age > 40 years (HR 2.5) were risk factors for conversion to THA. Stage > 3a ONFH (HR 2.0) and age > 40 years (HR 1.9) were risk factors for radiological failure.
Conclusion: The 15 year outcomes after TRO for ONFH are unfavorable because osteoarthritic changes occur after five years post-operatively. Cite this article: Bone Joint J 2017;99-B:175-83.
Keywords: Conversion total hip arthroplasty; Long-term outcome; Non-traumatic osteonecrosis of the femoral head; Osteoarthritic change; Radiological failure; Transtrochanteric rotational osteotomy.
©2017 The British Editorial Society of Bone & Joint Surgery.
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