Shoulder instability. Assessment of anterior-posterior translation with a knee laxity tester

Acta Orthop Scand. 1995 Oct;66(5):398-400. doi: 10.3109/17453679508995572.


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.

MeSH terms

  • Adolescent
  • Adult
  • Biomechanical Phenomena
  • Female
  • Humans
  • Joint Instability / diagnosis
  • Joint Instability / physiopathology*
  • Knee
  • Male
  • Middle Aged
  • Orthopedic Equipment*
  • Reproducibility of Results
  • Shoulder Joint / physiopathology*