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Active knee extension from 90 to 45 degrees
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Active knee flexion from 45 to 90 degrees
Isometric quadriceps contraction with the knee at 0 degrees.
Isometric quadriceps contraction with a knee flexion angle between 15 and 30 degrees
Isometric quadriceps contraction with a knee flexion angle between 45 and 90 degrees
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On strain-guage testing, the highest strain in the ACL graft was reported during isometric quadriceps contraction between 15 and 30 degrees of flexion. At this degree of flexion, the quadriceps is pulling the tibia anteriorly and may damage the graft. The other exercises demonstrated significantly less strain on a well-positioned ACL reconstruction graft.
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