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KMID : 1144520220340010043
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Knee Surgery & Related Research
2022 Volume.34 No. 1 p.43 ~ p.43
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Intramedullary rod insertion places the femoral component more laterally during Oxford medial unicompartmental knee arthroplasty
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Tanaka Toshikazu
Suda Yoshihito
Kamenaga Tomoyuki
Saito Akira
Fujishiro Takaaki
Okamoto Koji
Hiranaka Takafumi
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Abstract
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Background: This study aims to assess the influence of intramedullary rods on the implantation positions of femoral components using Microplasty instrumentation in Oxford unicompartmental knee arthroplasty. We hypothesized that femoral components can be laterally implanted incorrectly when using intramedullary rods.
Methods: This prospective study included all 45 consecutive patients (53 knees) who underwent Oxford unicompartmental knee arthroplasty surgery for anteromedial osteoarthritis or spontaneous osteonecrosis of the knee at our hospital during the study period. A custom-made toolset comprising a triangular caliper and circular trial bearings was used to evaluate the distance between the bearing and the vertical wall of the tibia implant (wall-bearing space) using the caliper at 90° flexion both with and without intramedullary rods.
Results: The wall-bearing space was significantly larger when the intramedullary rod was used than when intramedullary rod was not used (1.8?±?1.1 mm versus 3.4?±?1.2 mm, P?
Conclusions: Femoral components can be laterally implanted incorrectly by an average of 1.6 mm when using intramedullary rods. The wall-bearing space should be evaluated using trial components, and if the relationship is improper, it should be corrected before keel slot preparation.
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KEYWORD
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Oxford unicompartmental knee arthroplasty, Intramedullary rod, Bearing dislocation, Wall-bearing space
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