Practice Quiz

PTA Physical Therapy Assistant

Category - Interventions

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Which statement is true about closed kinematic chain exercise when prescribed for anterior cruciate ligament (ACL) rehabilitation?
  1. Places significant strain on the anterior cruciate ligament and patellofemoral joint
  2. Generates low anterior shear force and tibial displacement
  3. Generates more isolated muscle activity
  4. Co-contraction of hamstrings and quadriceps do not occur
Explanation
Answer: B - Generates low anterior shear force and tibial placement.

Closed kinematic chain exercises can be safely used during anterior cruciate ligament rehabilitation. The exercises do not generate isolated muscle activity so there will be no isolated muscle strengthening. Closed chain exercise places less strain on the ACL.

Open kinematic chain exercises actually result in isolated muscle activity and thereby allow more specific muscle strengthening. But when there is fatigue, the stabilizing effect of these isolated muscles may be lost which might place great strain on the ACL.
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