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Article type: Research Article
Authors: Buchanan, Patricia A.a; *; **; *** | Kegerreis, Sam T.a; **** | Smith, Brad A.a; *****
Affiliations: [a] University of Indianapolis
Note: [*] Movement Essentials, 37 Logan St., Denver, Co 80203
Note: [**] Address reprint requests to Pat Buchanan, PT, ATC, 37 Logan Street, Denver, CO 80203.
Note: [***] Presented at the 1987 National Athletic Trainers Association Annual Meeting and Clinical Symposium in Columbus, Ohio, and American Physical Therapy Association Annual Conference in San Antonio, Texas.
Note: [****] Krannert Graduate School of Physical Therapy, University of Indianapolis, 1400 E. Hanna Ave., Indianapolis, IN 46227
Note: [*****] Replay Physical Therapy, 2705 S. Berkeley Rd., Ste. 3B, Kokomo, IN 46902
Abstract: A clinical study was conducted to determine if measurements of anterior knee laxity taken prior to Cybex testing differ from measurements obtained after testing. Twenty-eight patients who each had one anterior cruciate ligament (ACL)-injured knee and one normal knee participated in the study. Physical therapists-certified athletic trainers performed tests of anterior laxity on all knees using the KT-1000 knee ligament arthrometer. Patients were then tested on the Cybex at 60 and 240 deg/sec. Laxity measurements were repeated after Cybex testing. Data were analyzed by paired t-tests. Nonreconstructed ACL-injured knees showed significant laxity increases after Cybex testing for passive anterior drawer with 15 lbs of force (t = 3.218, p < .01), with 20 lbs of force (t = 2.189, p < .05), and for quadriceps active displacement (t = 2.390, p < .05). Although not statistically significant, laxity decreases were observed for reconstructed ACL-injured knees for quadriceps active displacement. The laxity of normal knees did not change significantly for any tests. The authors recommended that clinicians consistently perform KT-1000 measurements either before or after more vigorous clinical evaluations of patients with ACL injuries. The laxity increases observed among nonreconstructed ACL-injured knees may encourage therapists and athletic trainers to consider controlling anterior tibial displacement in ACL-injured patients.
Keywords: Isokinetic assessment, ligamentous laxity assessment, arthrometer, KT-1000
DOI: 10.3233/IES-1991-1401
Journal: Isokinetics and Exercise Science, vol. 1, no. 4, pp. 173-180, 1991
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