title: An apparatus for isometric study of the human knee jerk.
mesh_terms: D006801:Humans; D007717:Knee / Q000502:physiology*; D009119:Muscle Contraction; D009470:Muscle Spindles / Q000502:physiology; D010329:Patella / Q000502:physiology*; D012026:Reflex, Stretch / Q000295:instrumentation*