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.
Synonyms:
Extension lag
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FORUM DISCUSSIONS
Extension Lag but not related to scar tissue??
CLINICAL PUBLICATIONS
Physiological quadriceps lag: its nature and clinical significance. Stillman BC. Aust J Physiother. 2004;50(4):237-41.