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The large four-part extensor muscle at the front of the thigh.

quad′ri·cip′i·tal (-sĭp′ĭ-tl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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These mechanisms may alter afferent signals sent to the nervous system, thereby causing an involuntary hamstring contracture with a selective quadricipital shutdown [2].
There may be combinations of different misalignments, such as the syndrome of external tibial sprain, observed in some runners, combining anteversion of femoral neck with internal rotation of the hip and genu varum, with or without hyperextension of the knee, converging patella, excessive Q angle (quadricipital), tibia varus, functional equinus, and compensatory pronation of the foot.