A Novel Technique for Varus Tibial Cutting for Oxford Unicompartmental Knee Arthroplasty
Takafumi Hiranaka, MD,corresponding author Toshikazu Tanaka, MD, Takaaki Fujishiro, MD, Kenjiro Okimura, MD, Rika Shigemoto, MD, Shotaro Araki, MD, Ryo Okada, MD, Ryohei Nako, MD, and Koji Okamoto, MDKnee
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.
Link to article