Shoulder instability. Assessment of anterior-posterior translation with a knee laxity tester.
We developed a simple method to measure the anterior-posterior (AP) translation of the shoulder joint: by positioning the Donjoy Knee Laxity Tester horizontally over the shoulder girdle, the AP translation was measured after applying a standardized sagittal force. Measurement of AP-translation during two tests on the same shoulder was reproducible with an intraclass correlation coefficient (ICC) of 0.996. In normal subjects the mean side difference was 0.6 mm, corresponding to a p-value of 1.00. In patients with unilateral instability AP-translation was significantly larger on the injured shoulder. Furthermore, the intraindividual differences in AP-translation were significantly larger in patients with unilateral instability than in normal subjects. Individuals with multidirectional instability had significantly higher values than any of the other groups.
D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis / Q000503:physiopathology*; D007717:Knee; D008297:Male; D008875:Middle Aged; D009983:Orthopedic Equipment; D015203:Reproducibility of Results; D012785:Shoulder Joint / Q000503:physiopathology*