In Vivo Determination of Kinematics for Subjects Having a Zimmer Unicompartmental High Flex Knee System

Akizuki, Shaw; Mueller, John Kyle P.; Horiuchi, Hiroshi; Matsunaga, Daigo; Shibakawa, Atsuyuki; Komistek, Richard D.

doi:10.1016/j.arth.2008.06.013

Cited by 52 publications

(41 citation statements)

References 39 publications

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“…Biomechanical findings for individuals with UKA also display mixed results [1,6,11,24,31]. For UKA knee kinematics generated from radiography or fluoroscopy [1,6,24], it has been reported that satisfactory knee kinematics are displayed compared with TKA or healthy knees.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Simpson

Kinsey³

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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Section: Introductionmentioning

confidence: 99%

“…For UKA knee kinematics generated from radiography or fluoroscopy [1,6,24], it has been reported that satisfactory knee kinematics are displayed compared with TKA or healthy knees. However, Akizuki et al [1] observed that kinematic patterns were not consistent among patients and interparticipant variability was high.…”

Section: Introductionmentioning

confidence: 99%

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Simpson

Kinsey³

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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“…However, compared with coronal and sagittal alignment of the knee, there are no data for reliable rotational alignment of a UKA. Rotational alignment of the femoral component would be close to the SEA when it is adjusted to the tibial cut surface with proper MCL tension [2]. Moreover, the SEA is a functional flexion-extension axis and considered an anatomic basis of the coronal plane of the knee reference [8,9,14,20,29], although the reliability of the SEA measurement has not been proven [3,5].…”

Section: Discussionmentioning

confidence: 99%

“…The positional relationship between the femoral and tibial components would be the most important factor for rotational alignment in UKA. When the rotational alignment of the femoral component is aligned parallel to the tibial cut surface in flexion of the knee, one would expect the femoral component would be aligned to the SEA in UKAs and TKAs [2]. Given the femoral component is aligned to the SEA, the rotational alignment of the tibial component should be aligned to the SEA to avoid rotational mismatch with the femoral component in extension of the knee.…”

Section: Introductionmentioning

confidence: 99%

“…We therefore addressed three questions: (1) is the medial wall of the notch parallel to the AP axis of the tibia at a 90°-flexion angle, (2) are the origins of the ACL and PCL located lateral to the line on the medial wall of the notch, and (3) is the mediolateral (ML) dimension of the bone cut surface of the medial tibial plateau wide enough relative to the AP dimension to use the commercially available UKA tibial components when the tibia is cut parallel to the medial wall of the notch?…”

Section: Introductionmentioning

confidence: 99%

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Is the Medial Wall of the Intercondylar Notch Useful for Tibial Rotational Reference in Unicompartmental Knee Arthroplasty?

Kawahara¹,

Matsuda²,

Okazaki³

et al. 2012

Clinical Orthopaedics &Amp; Related Research

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Background It is difficult to implant components in the correct rotational position in the narrow operating field in a unicompartmental knee arthroplasty. Although no rotational reference has been confirmed for unicompartmental knee arthroplasty, the AP axis of the tibia may serve as a reference for unicompartmental knee arthroplasty and TKA. However, it is difficult to identify the AP axis during unicompartmental knee arthroplasty, especially with the tibia first-cut technique. Questions/purposes We explored whether the medial wall of the intercondylar notch could be useful for the tibial rotational reference as an alternative to the AP axis in unicompartmental knee arthroplasty. Methods We scanned the knees of 24 healthy Asian patients (45 knees) at a flexion angle of 908 using open MRI, then measured the angle between the AP axis and the medial wall of the notch. We determined whether the origins of the ACL and PCL were located lateral to the line on the medial wall of the notch and whether the mediolateral dimension of the bone cut surface of the medial tibial plateau was wide enough relative to the AP dimension to use the commercially available unicompartmental knee arthroplasty tibial components when the tibia was cut parallel to the medial wall of the notch.Results At 908 flexion the medial wall of the notch was externally rotated 0.18 ± 4.48 relative to the AP axis. In all knees, the ACL and PCL were located lateral to the line on the medial wall of the notch. The mediolateral dimension of the bone cut surface was wide enough to use the commercially available tibial components. Conclusions At 908 flexion the medial wall of the intercondylar notch is almost parallel to the AP axis of the tibia at and we believe a reasonable candidate for a rotational reference of tibial placement in unicompartmental knee arthroplasty. This landmark would need to be confirmed in other populations and in patients with osteoarthritis.

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Safe bearing region for avoiding meniscal bearing impingement and overhang in mobile‐bearing unicompartmental knee arthroplasty

Zheng,

Dai,

Zou

et al. 2024

Journal Orthopaedic Research

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The purposes of this study were to propose a quantitative method of bearing overhang to minimize the effect of bearing spinning on mobile‐bearing unicompartmental knee arthroplasty (MB UKA), suggest and apply safe bearing regions in daily activities. The overhang distance and area were calculated for neutral and spinning positions. The safe bearing regions were based on the relationship between bearing overhang and linear wear rate. Eleven patients were included in an in‐vivo experiment under dual fluoroscopic imaging following medial MB UKA. The bearing position was tracked by minimal joint space width, and the bearing overhang was calculated accordingly. Due to an equal contribution of1 mm increase in medial overhang and 30 mm2 overhang areato wear rate, the maximum effect of potential bearing spinning on medial overhang distance was approximately three times as large as the overhang area. The safe bearing distance and area regions were rectangles and arches with different scales for different size combinations of bearing, femoral and tibial components. The maximum bearing overhang area during lunge (R=0.76, p=0.006) and open‐chain exercise (R=0.68, p=0.02) significantly correlated with the overhang area in standing. The overhang area can be an appropriate parameter for evaluating dislocation degree less affected by potential bearing spinning than the overhang distance in clinical practice. The corresponding safe overhang area regions were proposed for surgical planning and postoperative dislocation degree evaluation. The bearing overhang area in static standing posture can be a valuable reference to estimate the dynamic overhang area and dislocation degree during motion.This article is protected by copyright. All rights reserved.

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In Vivo Determination of Kinematics for Subjects Having a Zimmer Unicompartmental High Flex Knee System

Cited by 52 publications

References 39 publications

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Is the Medial Wall of the Intercondylar Notch Useful for Tibial Rotational Reference in Unicompartmental Knee Arthroplasty?

Safe bearing region for avoiding meniscal bearing impingement and overhang in mobile‐bearing unicompartmental knee arthroplasty

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