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KMID : 1207720200120040554
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Clinics in Orthopedic Surgery
2020 Volume.12 No. 4 p.554 ~ p.557
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A Novel Technique for Varus Tibial Cutting for Oxford Unicompartmental Knee Arthroplasty
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Hiranaka Takafumi
Tanaka Toshikazu
Fujishiro Takaaki
Okimura Kenjiro
Shigemoto Rika
Araki Shotaro
Okada Ryo
Nako Ryohei
Okamoto Koji
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Abstract
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To reduce the stress on the medial tibial cortex and to decrease the risk of fracture, a varus cut of the tibia appears to be a reasonable alternative to the orthogonal cut by conventional methods. We present a new instrument and procedure, which enables a varus tibial cut for Oxford unicompartmental knee arthroplasty. We used a custom-made, slidable fixator instead of the standard fixator to set the extramedullary rod on the leg. We also made a numeric formula and a chart to arrange the varus cutting angle using the length of the mediolateral shift of the distal end and the longitudinal extension length of the extramedullary tibial rod. A varus cut up to 4.5° can be controlled. This technique is a simple and useful means of obtaining a varus tibial cut for Oxford unicompartmental knee arthroplasty.
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KEYWORD
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Arthroplasty, Replacement, Knee, Operation, Alignment
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