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Measuring anterior tibial translation in anterior cruciate ligament deficient and healthy individuals during open and closed chain exercises
Abstract   Peer reviewed

Measuring anterior tibial translation in anterior cruciate ligament deficient and healthy individuals during open and closed chain exercises

Susan L Keays, Mark Sayers, Daniel Mellifont and Carolyn A Richardson
Australian Journal of Physiotherapy: e-Supplement 2009 APA Conference Week Abstracts, Vol.55(4), p.23
Australian physiotherapy Association (APA) Conference Week : Musculoskeletal Physiotherapy Australia, 2009 (Sydney, Australia, 01-Oct-2009–05-Oct-2009)
2009
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Abstract

Clinical Sciences Human Movement and Sports Science cruciate ligament patients exercise
It is well established that, in anterior cruciate ligament deficient patients, open chain exercises increase anterior tibial translation. Such exercises can lead to stretching or pull-out of the reconstructed graft post surgery and should initially be avoided. This study hypothesises that anterior tibial translation can occur during both open chain and closed chain exercises. Fifteen patients with chronic anterior cruciate deficiency and 15 healthy subjects matched for age, gender and sports history were assessed using an infra red tracking system. Markers were carefully positioned on the tibial tuberosity and the patella and the subjects performed the following therapeutic exercises initially without and then with quadriceps/hamstring co-contraction. Open chain: straight leg raising with the knee at zero degrees, leg raising with the knee flexed to 30 degrees, knee extension over a bolster (resisted and non-resisted). Closed chain: wall squat with the knees at 30 and 60 degrees of flexion and single leg squat to 30 and 60 degrees Analysis of variance was used to compare the amount of tibial translation occurring during the above therapeutic exercises in the injured and uninjured legs of anterior cruciate deficient subjects and in healthy individuals with and without hamstring co-contraction. This study provides important information regarding the choice of safe exercises that do not cause tibial translation or graft stretching post-operatively. It also clarifies the role of co-contraction during anterior cruciate ligament rehabilitation.

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