Abstract
Introduction: Osteonecrosis of the femoral head (ONFH) remains a therapeutic challenge for patients undergoing total hip arthroplasty (THA). The majority of these patients are young with high functional demand, and show an increased risk of dislocation following surgery than patients with osteoarthritis. The use of double mobility cup (DMC) has been linked with lower rates of complications when compared to conservative cups; however, the literature is scarce over DMC results in patients with ONFH. The aim of the study is to report the early outcomes of patients with ONFH treated with THA-DMC. Materials: A retrospective analysis of patients suffering from ONFH who underwent THA using DMC (THA-DMC) from 2006 to 2015 were evaluated for functional status and risk of post-operative complications. Thirty THA-DMC in 26 patients with a mean follow-up of 51 months were evaluated clinically (modified Hip Harris Score) and radiologically. Results: The mean age of the included patients was 54.9 years. At final follow-up, the mean modified Hip Harris score was 98.7 ± 2.7 and no dislocation episodes or revision surgeries were recorded. The radiological assessment revealed no signs of migration/tilting, radiolucent lines, periprosthetic osteolysis or heterotopic ossification over the DMC component and the femoral stem. The survival rate over 51 months of follow-up was 100%. Discussion: The use of the new generation of dual mobility cup in patients with ONFH showed excellent functional early results with no major complications such as dislocation.
Highlights
Osteonecrosis of the femoral head (ONFH) is defined when cellular death of bone occurs due to disruption of the blood supply that leads to the collapse of the architectural boney structure [1]
The aim of this study is to evaluate the early functional status and dislocation rate of a consecutive series of patients suffering from advanced ONFH that underwent total hip arthroplasty (THA) with double mobility cup (DMC)
Twenty six patients with primary ONFH were treated with THA using DMC during the study period
Summary
Osteonecrosis of the femoral head (ONFH) is defined when cellular death of bone occurs due to disruption of the blood supply that leads to the collapse of the architectural boney structure [1]. This will eventually lead to articular cartilage damage and osteoarthritis of the joint [1]. The four main etiologies of ONFH are idiopathic, dyslipidemia, chronic alcoholism, and corticosteroid treatment [2]. The fact that most of these patients are young and have high functional demand, the risk of dislocation following THA in ONFH compared to THA for primary
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