Erschienen in:
07.06.2023 | Original Article
Mid-term clinical and radiographic outcome of metal-on-metal hip resurfacing through an anterolateral approach
verfasst von:
D. Regis, G. Lugani, A. Valentini, A. Sandri, C. Ambrosini, F. Bagnis, A. Dorigotti, S. Negri, B. Magnan
Erschienen in:
MUSCULOSKELETAL SURGERY
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Ausgabe 4/2023
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Abstract
Purpose
The aim of this retrospective study was to evaluate the medium-term clinical and radiographic results of current generation metal-on-metal resurfacing prostheses performed through anterolateral approach.
Materials and methods
Fifty-seven hips in 52 patients underwent resurfacing arthroplasty. Two patients died from unrelated causes, leaving 55 hips in 35 males (3 bilateral) and 15 females (2 bilateral), with a mean age at surgery of 56.2 years (range, 27–70 years). Clinical and radiographic assessment was carried out preoperatively and at follow-up in all the survived cases. The cumulative survival rate was determined according to the method of Kaplan–Meier.
Results
At a mean follow-up of 5.2 years (range, 1.8–9.1 years), 2 HRs of the same female patient were revised because of early loosening of the acetabular component. Deep venous thrombosis and transient femoral nerve palsy occurred both in 1 case. No specific complications of HR were observed. Average Harris hip score improved significantly from 59.8 points (range, 30.4–90.6) preoperatively to 93.7 points (range, 53–100) at the latest examination. Neck narrowing showed an average of 3.27%, but it never exceeded 10%. Nonprogressive acetabular radiolucencies and osteolysis were detected both in 2 hips. A high rate of patients (32, 60.4%) developed heterotopic ossifications, although low-grade in most cases (27, 84.4%). The cumulative survival rate at 9.1 years with revision for any reason as the end point was 93.0%.
Conclusions
The early clinical and radiographic results of modern metal-on-metal hip resurfacing performed through an anterolateral approach are promising, but longer-term follow-up studies are necessary.