A 'quadriceps lag' is present when a patient cannot fully 'actively' extend the knee (straighten the leg using muscle contraction), but it can be fully 'passively' extended by the clinician.
This would imply that the quadriceps muscle is weak or inhibited, or maybe that there are some adhesions present causing pain and inhibition.
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An allograft is a graft using tissue that did not originate from the patient but from another person.
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