Metal-on-metal dysplasia cup total hip arthroplasty for hip osteoarthritis secondary to developmental dysplasia of the hip
Mehmet Emre Baki1, Alper Timurkaynak1, Hafız Aydın1, Celal Baki2
1Department of Orthopedics and Traumatology, Medical Faculty of Karadeniz Teknik University, Trabzon, Turkey
2Department of Orthopedics and Traumatology Retired Professor, Medical Faculty of Karadeniz Teknik University, Trabzon, Turkey
Keywords: Developmental dysplasia of the hip; metal-on-metal hip prosthesis; total hip arthroplasty.
Objectives: This study aims to evaluate the clinical and radiological results of metal-on-metal dysplasia cup total hip arthroplasty (THA) for hip osteoarthritis secondary to developmental dysplasia of the hip (DDH).
Patients and methods: Between May 2009 and October 2011, THA was performed on 27 hips (7 Crowe type II, 9 Crowe type III, 11 Crowe type IV) of 22 patients (2 males, 20 females; mean age 43 years; range 25 to 63 years) with hip osteoarthritis secondary to DDH. All patients were evaluated clinically and radiographically.
Results: Average follow-up period was 34.2 months (range 24-53 months). While mean Harris hip score (HHS) was 43 (range 30 to 72 points) preoperatively, it was 92 (range 87 to 98 points) at final follow-up. Two patients developed sciatic nerve palsy postoperatively. Recurrent dislocation occurred in one patient one year after the operation. Mean cup inclination was 45.6° (range 42°-51°). Heterotopic ossification developed in eight patients. No patient’s acetabular and femoral component migrated or subsided significantly. None of the implants was revised.
Conclusion: Early clinical and radiological results of metalon- metal dysplasia cup THA in DDH are satisfactory.