Abstract
Introduction
Combining patient-specific instrumentation (PSI) with a balancer device in total knee arthroplasty (TKA) to achieve functional femoral rotational alignment is a novel technique. The primary goal of this study was to introduce a new method to combine PSI with a gap-balancing technique and to determine the impact of the technique on rotation of the femoral component.
Materials and methods
Twenty-five primary TKAs (15 women, 10 men) were prospectively studied. All TKAs involved PSI with an associated gap-balancing device. Front plane alignment was performed intraoperatively with the PSI, followed by rectangular, symmetrical extension and creation of a flexion gap using the balancer device to set the femoral rotation.
Results
Femoral component rotation was between 3° internal and 6° external rotation versus the transepicondylar axis. There were no postoperative signs of patellofemoral dysfunction. In no cases was the resulting joint line displacement >3 mm. The mean elevation was 1.2 ± 0.9 mm (range 0–3). The leg axis was straight in all cases (±3°), at a mean of 1.6° ± 1.0° varus (range 0°–3° varus).
Conclusions
PSI was with the gap-balancing technique was successfully used without affecting anatomical alignment. With the balancer device, PSI can be used more widely than techniques based solely on landmarks, as the soft-tissue tension can be taken into account, thus virtually eliminating flexion instabilities.
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Preparation of this manuscript was supported by Smith & Nephew GmbH, Marl, Germany. Smith & Nephew had no involvement in the collection, analysis or interpretation of the data, in the writing of the report or in the decision to submit the results for publication.
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Hommel, H., Perka, C. Gap-balancing technique combined with patient-specific instrumentation in TKA. Arch Orthop Trauma Surg 135, 1603–1608 (2015). https://doi.org/10.1007/s00402-015-2315-6
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DOI: https://doi.org/10.1007/s00402-015-2315-6