In vivo laxity of stable versus anterior cruciate ligament-injured knees using a navigation system: a comparative study.
We compared antero-posterior translation and internal-external rotation of the tibia in stable knees without anterior cruciate ligament (ACL) injury with those of ACL injured knees using a navigation system and suggest an objective data. Forty-four patients treated for a meniscal tear without ACL injury were allocated to stable group, and 41 patients were allocated to ACL injury group. Antero-posterior displacement and rotation of knees were measured in 0, 30, 60 and 90 degrees of flexion using navigation. Mean anterior displacements were 3.6 +/- 2.0, 6.7 +/- 2.7, 6.0 +/- 2.4 and 4.7 +/- 1.8 mm at 0, 30, 60 and 90 degrees of flexion, respectively, in stable group, and 6.8 +/- 3.6, 14.7 +/- 3.5, 11.9 +/- 4.6 and 8.5 +/- 4.0 mm in ACL injury group. Mean total rotation values were 18.8 +/- 4.5 degrees, 31.4 +/- 4.2 degrees, 30.1 +/- 5.1 degrees and 29.2 +/- 5.9 degrees in stable group and 22.7 +/- 6.9 degrees , 37.6 +/- 5.8 degrees, 34.0 +/- 9.4 degrees and 31.8 +/- 8.8 degrees in ACL injury group. Quantitative values of antero-posterior translations and rotations of stable and ACL injured knees were obtained using a navigation system. The laxity data may be useful to establish the diagnosis of an ACL injury and evaluation of post-operative results.
Department of Orthopedics, Center for Joint Disease, Chonnam National University Hwasun Hospital, Jeonnam, Korea.
Eun Kyoo
EK
Song
Jong Keun
JK
Seon
Sang Jin
SJ
Park
Chang Ich
CI
Hur
Dam Seon
DS
Lee
D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000503:physiopathology* / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D001182:Arthroscopy; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000601:surgery; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular / Q000502:physiology; D012399:Rotation; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D055815:Young Adult