A modified technique to reduce tibial keel cutting errors during an Oxford unicompartmental knee arthroplasty

Inui, Hiroshi; Taketomi, Shuji; Tahara, Keitarou; Yamagami, Ryota; Sanada, Takaki; Tanaka, Sakae

doi:10.1007/s00167-016-4151-9

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…We think there are several other reasons, including our technical error of cutting the surface, and implanting the components. 38 A navigation system or robotic surgery might be necessary for accurate implantation and excellent results, even though previous studies have not yet reported on the superiority of this technology. 39,40 With regard to the relationship between flexion angle and clinical outcomes, the items which influenced most on the difference of the outcomes of KOOS subscales between group 1 and group 3 was as follows: (symptom) S5.…”

Section: Discussionmentioning

confidence: 99%

Necessary Factors to Achieve Deep Flexion for Asian Populations after Oxford Unicompartmental Knee Arthroplasty

et al. 2019

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There have been many reports on the clinical outcomes of Oxford unicompartmental knee arthroplasty (UKA); however, none have investigated the influence of flexion angle after UKA on clinical outcomes. The objective of this study was to clarify the relationship between outcomes and the postoperative maximum flexion angle and reveal the necessary factors for maximum flexion angle ≥ 140 degrees which is considered necessary for Asian populations. We categorized 212 UKA patients into the following three groups based on the postoperative maximum flexion angle: group 1 had flexion angle ≥ 140 degrees in 80 patients (38%), group 2 had 130 degrees ≤ flexion angle < 140 degrees in 80 patients (38%), and group 3 had flexion angle < 130 degrees in 52 patients (24%). Furthermore, we compared the postoperative clinical outcomes between the three groups and conducted multivariable regression analyses to assess parameters affecting the flexion angle. Postoperative Knee Society function scores for group 1 was significantly higher than for group 3. Group 1 had higher mean knee injury and osteoarthritis outcome scores (KOOS) in all subscales and significantly higher KOOS scores in the sports and quality of life subscales compared with group 2 and in all subscales compared with group 3. Multivariable logistic regression showed that preoperative flexion angle and tibial component posterior slope were associated with maximum flexion angle ≥ 140 degrees. Maximum flexion angle ≥ 140 degrees after Oxford UKA improved the clinical results, particularly for patient-reported outcomes. Furthermore, the tibial posterior slope was an important factor in achieving maximum flexion angle ≥ 140 degrees in UKA patients.

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Section: Discussionmentioning

confidence: 99%

Necessary Factors to Achieve Deep Flexion for Asian Populations after Oxford Unicompartmental Knee Arthroplasty

et al. 2019

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“…Femoral drilling was performed with an Oxford Microplasty device (MP: Biomet Ltd., Swindon, UK) to facilitate reproducible implantation [18]. After these procedures, we performed the same gap‐balancing procedure between knee flexion and extension and a modified keel cutting method as previously reported [5]. With the trial component and bearing in place, the knee was manipulated through a full range of motion (ROM) to demonstrate joint stability, the security of the mobile bearing and absence of impingement.…”

Section: Methodsmentioning

confidence: 99%

Intraoperative mobile-bearing movement in Oxford unicompartmental knee arthroplasty

Kawaguchi

Inui

Taketomi

et al. 2018

Knee Surg Sports Traumatol Arthrosc

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“…Femoral drilling was performed using an Oxford Microplasty device (MP: Biomet Ltd., Swindon, UK) to facilitate reproducible implantation 18 . Following these procedures, we performed a gap balancing procedure between knee flexion and extension and a modified keel cutting method as previously reported 31 . With the trial component and bearing in place, the knee was manipulated through a full range-of-motion (ROM) to demonstrate joint stability, security of the mobile-bearing joint, and absence of impingement.…”

Section: Methodsmentioning

confidence: 99%

Cruciate ligament force of knees following mobile-bearing unicompartmental knee arthroplasty is larger than the preoperative value

Kono

Inui

Tomita

et al. 2021

Sci Rep

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We analyzed the implantation effects on cruciate ligament force in unicompartmental knee arthroplasty (UKA) and determined whether kinematics is associated with the cruciate ligament force. We examined 16 patients (17 knees) undergoing medial UKA. Under fluoroscopy, each participant performed a deep knee bend before and after UKA. A two-dimensional/three-dimensional registration technique was employed to measure tibiofemoral kinematics. Forces in the anteromedial and posterolateral bundles of both the anterior cruciate ligament (aACL and pACL) and the anterolateral and posteromedial bundles of the posterior cruciate ligament (aPCL and pPCL) during knee flexion were analyzed pre- and post-UKA. Correlations between changes in kinematics and ligament forces post-UKA were also analyzed. Preoperatively, the aACL forces were highly correlated with anteroposterior (AP) translation of the lateral condyles (Correlation coefficient [r] = 0.59). The pPCL forces were highly correlated with the varus–valgus angulation (r = − 0.57). However, postoperatively, the PCL forces in both bundles were highly correlated with the AP translation of the medial femoral condyle (aPCL: r = 0.62, pPCL: r = 0.60). The ACL and PCL forces of the knees post-UKA were larger than those of the knees pre-UKA. Kinematic changes were significantly correlated with the cruciate ligament force changes.

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A modified technique to reduce tibial keel cutting errors during an Oxford unicompartmental knee arthroplasty

Abstract: Retrospective comparative study, Level III.

Cited by 10 publications

References 19 publications

Necessary Factors to Achieve Deep Flexion for Asian Populations after Oxford Unicompartmental Knee Arthroplasty

Necessary Factors to Achieve Deep Flexion for Asian Populations after Oxford Unicompartmental Knee Arthroplasty

Intraoperative mobile-bearing movement in Oxford unicompartmental knee arthroplasty

Cruciate ligament force of knees following mobile-bearing unicompartmental knee arthroplasty is larger than the preoperative value

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