Mid-term results of total hip arthroplasty with modified trochanteric osteotomy in Crowe type IV developmental dysplasia of the hip

Abstract Introduction: The objective of this study was to explore mid-term clinical results of cementless total hip arthroplasty (THA) with modified trochanteric osteotomy in Crowe type IV developmental dysplasia of the hip (DDH).Patients and method: Thirteen patients (13 hips) with Crowe type IV DDH who underwent THA used modified trochanteric osteotomy between May 2013 and October 2019 were retrospectively analyzed. Mean follow-up was 5.2 ± 0.8 years (range, 4.9-6.1 years).Results: Mean Harris Hip Score (HHS) significantly (p < 0.05) improved from 30.7 ± 5.8 (range, 22-38) to 87.5 ± 3.6 (range, 83-93). The mean leg length discrepancy (LLD) was 53.4 ± 9.1 mm (range, 42.1-68.5 mm) preoperatively. The final LLD was 5.6 ± 2.4 mm (range, 2.4-9.1 mm). The mean leg length after surgery was 47.4 ± 10 mm (range, 33.6-67.2 mm). The average duration of bone union for greater trochanter (GT) was 2.5 ± 0.6 months (range, 1.5-3.6 months). There was no infection, GT non-union, or loosening (septic or aseptic) of the stem or cup in any case.Conclusions: THA with modified trochanteric osteotomy with cementless cup is an effective treatment for Crowe type IV developmental dysplasia of the hip. It can rebuild complex biomechanics and biology of hip dysplasia without increasing complications.