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Takafumi Hiranaka,Toshikazu Tanaka,Kenjiro Okimura,Takaaki Fujishiro,Rika Shigemoto,Shotaro Araki,Ryo Okada,Ryohei Nako,Tomoyuki Kamenaga,Koji Okamoto 대한정형외과학회 2021 Clinics in Orthopedic Surgery Vol.13 No.1
In Oxford unicompartmental knee arthroplasty, the relationship between the mobile bearing and the vertical wall of the tibial tray is important in preventing bearing dislocation. Separation of the bearing from the vertical wall can cause spinning of the bearing with an increased risk of subsequent dislocation. We report on intraoperative adjustment of the tibial tray performed to prevent the bearing from spinning. After tibial and femoral bone cutting and adjustment of the flexion and extension gap, the trial bearing is inserted and the bearing-vertical wall distance is evaluated before the preparation using the tibial template and bearing trial. In the case of separation, it can be resolved by medialization with or without rotational adjustment. The technique is useful and can be easily performed, it is therefore recommendable for all cases of Oxford mobile-bearing unicompartmental arthroplasty.
A Novel Technique for Varus Tibial Cutting for Oxford Unicompartmental Knee Arthroplasty
Takafumi Hiranaka,Toshikazu Tanaka,Takaaki Fujishiro,Kenjiro Okimura,Rika Shigemoto,Shotaro Araki,Ryo Okada,Ryohei Nako,Koji Okamoto 대한정형외과학회 2020 Clinics in Orthopedic Surgery Vol.12 No.4
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.