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Abstract
BackgroundTotal hip arthroplasty is a successful treatment for hip osteoarthritis. Primary and secondary implant fixation is dependent on implant design and plays an important role in the longevity of an implant. In this study, we assessed the self-locking cementless MasterSL femoral stem.Materials and methodsIn this single-centre prospective study, 50 consecutive hips with the indication for total hip arthroplasty, who met the inclusion criteria, received the MasterSL stem from LIMA Corporate. Patients had pre- and post-operative clinical and radiological assessment and completed patient-reported outcome measures [Oxford Hip Score (OHS), Harris Hip Score (HHS) and Forgotten Joint Score (FJS)] at the 6-week and 6-, 12- and 24-month mark. Post-operative X-rays were assessed for osteointegration (Engh Score), alignment and subsidence.ResultsAfter 2 years, aseptic survival was 100%. One hip had to be explanted due to early deep infection and was excluded from the study. At 2 years, the patients reported a significant improved HHS and OHS of 95.3 ± 5.8 and 46.1 ± 3.6 (mean ± standard deviation), respectively, compared to preoperatively. The mean ± standard deviation for the FJS was 86.4 ± 18.7 with two-thirds of the patients reporting a score above 85. The mean Engh score is 15.1 ± 5.9 (mean ± standard deviation) with no patient scoring below 1 which suggests good osteointegration in all femoral stems.ConclusionsThe MasterSL femoral stem performed well in this short-term follow-up study, with high patient satisfaction and good signs of osteointegration. Long-term follow-up will be necessary to evaluate longevity.Level of evidenceLevel 3, Prospective cohort study.Trial registrationThe study was registered on the 30.03.2016 with Australia New Zealand Clinical Trials Registry (ACTRN12617000550303).
Highlights
Total hip arthroplasty (THA) has proven to be one of the most successful treatments in the field of orthopaedic surgery, even described as the “operation of the century” [1]
The redesigned MasterSL femoral stem is proclaimed to have increased stability within the femoral canal. These advancements have been proposed to improve and prolong the lifespan of the THA implants. In this single-centre prospective study, two experienced surgeons (KH and MW) assessed the M asterSL femoral stem, which was new to the Australian market, and yet to have product registration at the commencement of the study period
Cementless fixation of the femoral stem in THA has shown great success especially in younger patients and is preferred by many experienced orthopaedic surgeons [15]. This type of fixation relies on good primary and secondary integration. Manufacturers address these important factors with specific THA implant design including materials, surface coatings and finishes
Summary
Total hip arthroplasty (THA) has proven to be one of the most successful treatments in the field of orthopaedic surgery, even described as the “operation of the century” [1]. THA is considered the gold-standard treatment for advanced osteoarthritis of the hip; it is highly successful in improving patients’ pain, achieving excellent functional results, and has a proven track record of long-term survivorship [4]. Despite these successes, some THAs need revision, and with the rising number of procedures performed, the number of revisions rises. We assessed the self-locking cementless MasterSL femoral stem. Conclusions The MasterSL femoral stem performed well in this short-term follow-up study, with high patient satisfaction and good signs of osteointegration. Trial registration The study was registered on the 30.03.2016 with Australia New Zealand Clinical Trials Registry (ACTRN12617000550303)
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