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

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Clinical Orthopaedics and Related Research®

Abstract

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 90º 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 90º flexion the medial wall of the notch was externally rotated 0.1º ± 4.4º 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 90º 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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Acknowledgments

We thank Sumako Nishimura (Hitachi Medical Corporation) for assistance in operating the open MRI system, and Hiroyuki Nakahara MD and Shigetoshi Okamoto MD for assistance in the interobserver trial.

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Corresponding author

Correspondence to Shuichi Matsuda MD, PhD.

Additional information

Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.

Each author certifies that his or her institution has approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

This work was performed at Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University.

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Kawahara, S., Matsuda, S., Okazaki, K. et al. Is the Medial Wall of the Intercondylar Notch Useful for Tibial Rotational Reference in Unicompartmental Knee Arthroplasty?. Clin Orthop Relat Res 470, 1177–1184 (2012). https://doi.org/10.1007/s11999-011-2138-x

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