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Journal of Bone and Joint Surgery - British Volume, Vol 91-B, Issue SUPP_III, 395.  
Copyright © 2009 by British Editorial Society of Bone and Joint Surgery
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British Society For Computer Aided Orthopaedic Surgery

Glasgow, Scotland: 7–9 February 2008

President: Mr M Maheson

MEASUREMENT OF ANTEROPOSTERIOR AND ROTATIONAL STABILITY OF KNEE USING NAVIGATION SYSTEM

J.K. Seon; E.K. Song; S.J. Park; S.G. Cho; S.B. Cho; and T.R. Yoon

Center for Joint Disease, Chonnam National University Hwasun Hospital, Jeonnam, Korea

The aim of study was to provide normal value of anteroposterior and rotational stability of knee joints using navigation system.

From March 2007 to November 2007, 35 patients (23 men, 12 women) with a mean age of 36.1(16–57) years, who were treated with arthroscopy, without ligament injury of knee were included in our study. We measured amount of anteroposterior displacement and rotation of the knee in 0, 30, 60 and 90 degrees of flexion position using Orthopilot navigation system. All tests were performed by same single surgeon under manual maximal force.

The mean anterior displacement was 3.7±2.0, 6.6±2.2, 5.8±2.0 and 4.7±1.8 mm in 0, 30, 60 and 90 degrees of flexion respectively. The amount of anterior displacement at 30 degree of flexion was significantly larger than those of other degrees. The mean posterior displacement was 2.0±0.5, 2.2±0.4, 2.1±0.4 and 2.0±0.6 at each degree. There was no statistical difference in posterior displacement. The mean internal rotation was 10.3±2.7, 14.6±3.3, 16.2±2.9 and 15.0±4.3 degree at each degree. The amount of internal rotation at 0 degree of flexion was significantly smaller than those of other degrees. The mean external rotation was 8.4±3.4, 16.5±3.3, 13.3±3.8 and 15.0±4.3 degree at each degree. The amount of external rotation at 0 degree of flexion was significantly smallest and that of 30 degree was largest.

In the measurement of laxity using navigation, we could acquire previously mentioned results. The measurement of stability of knee will be useful in diagnosing ligament injury and evaluating degree of postoperative symptomatic improvement.

Correspondence should be addressed to Mr K Deep, General Secretary CAOS UK, Dept of Orthopaedics, Golden Jubilee National Hospital, Glasgow G81 4HX, Scotland. Email: caosuk{at}gmail.com






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General