Article
Ten years follow-up and clinical outcome of a short hip stem prosthesis: A retrospective systematic analysis
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Authors
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Stefan Weenders
- HEH Braunschweig, Braunschweig, Germany
| Published: | October 23, 2023 |
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Outline
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Objectives: Short stems for total hip arthroplasty are an alternative to traditional conventional long stems. Short stems are designed to facilitate minimal-invasive surgery, improve bone-stock preservation and mimic a physiological load distribution. However, there is little evidence of the long-term outcome of short stems. This study aims to analyze the 10-year survival rates and clinical outcomes of a short hip stem implant.
Methods: We retrospectively analyzed the patient records of the patients who underwent a total hip arthroplasty with a monoblock short hip stem prosthesis (Metha®) in 2008 and 2009 in our clinic. Patients were contacted and clinical follow-up was recorded using the German version of the modified Harris Hip Score. Furthermore, post-operative radiographs were analyzed and revision surgeries investigated. Statistical analysis was performed with SPSS Statistics v21.0 (SPSS Inc., Chicago, Illinois). Descriptive statistics were calculated. The primary endpoint of this study was a revision, independent of its reason. Survival analysis was done by calculating Kaplan-Meier estimates. A p-value < 0.05 was considered statistically significant. The clinical data were analyzed by an independent author who was not involved in the clinical management of the patients.
Results: Data from 339 primary monoblock implantations in 322 patients were retrieved (Table 1 [Tab. 1]).
The mean follow-up was 10.6 ± 2.2 years (range: 0.1 to 12.8 years). Seven patients underwent a revision. The 10-year survival rate with any revision surgery as the endpoint was 97.5%.
Figure 1 [Fig. 1]
The mean modified Harris Hip Score was 86 ± 9 (range 30 to 91 points). Of the 46 patients who did not score on the modified Harris Hip Score, 32 died and eight patients refused or could not be contacted. Five patients had an intraoperative fracture of the femur (1.6%). Two patients had a hip luxation (0.6%) and three patients had a femoral nerve lesion (0.9%). The mean cup inclination measures 40.4° ± 6.3° (range 22.5° to 58.0°). The stem tip-to-cortex distance, measured in the AP view, was 2.6 ± 1.9 mm (range 0 to 8.3 mm).
Conclusion: The 10-year survival rate of our used monoblock short hip stem implant is comparable to the traditional stems for total hip arthroplasty.
