Arthrogenic Muscle Inhibition: Why a Swollen Knee Switches Off the Quadriceps, and What Turns It Back On

Anyone who has tried to straighten a knee the day after surgery knows the sensation: the muscle is there, the intention is there, and nothing happens. That is not weakness in the ordinary sense. It is arthrogenic muscle inhibition - a reflex, nervous-system suppression of the muscles around an injured joint - and it is the reason quadriceps strength can lag for months after the joint itself has healed.

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