Abstract
Introduction
Optimal fixation of cementless total hip stems is essential for long-term survival rates.
Aim
The purpose of this prospective study was to evaluate the early clinical and radiological outcomes of two new total hip stems with metaphyseal (Symax®) and predominantly diaphyseal (Hipstar®) anchoring principles in comparison to the well-established straight Zweymueller (SL-Plus®) stem.
Method
Clinical and radiological evaluations of 74 patients were undertaken preoperatively as well as at 6 and 12 months postoperatively using the Harris Hip Score (HHS) and Western Ontario and McMaster Universities-Score.
Results
During follow-up no stem had to be revised. The mean preoperative HHS of the three study groups amounted to 54.6 ± 15.7 points. At the 12 months follow-up the mean HHS in the SL-Plus group (n = 22) was 88.3 ± 10.5 points, in the Hipstar group (n = 25) 83.3 ± 15.0 and the in Symax group (n = 27) 83.6 ± 15.1. Due to stress shielding the straight Hipstar stem revealed radiolucent lines in the proximal Gruen zones of about 60%, whereas the SL-Plus stem showed significantly more radiolucent lines (87%). However, subsequent long-term studies must be carried out in order to clarify if the progression of radiolucent lines may influence the clinical result and implant longevity.
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Bergschmidt, P., Bader, R., Finze, S. et al. Cementless total hip replacement: a prospective clinical study of the early functional and radiological outcomes of three different hip stems. Arch Orthop Trauma Surg 130, 125–133 (2010). https://doi.org/10.1007/s00402-009-0907-8
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DOI: https://doi.org/10.1007/s00402-009-0907-8