When a multiarticular muscle shortens such that lengthening at one joint causes it to shorten over another joint, it is called:

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Tenodesis refers to the phenomenon where a multiarticular muscle shortens in such a way that lengthening at one joint causes it to shorten over another joint. This is often utilized in rehabilitation and adaptive strategies for individuals with hand function impairment, allowing them to grasp objects by wrist extension which tightens the finger flexors due to the muscle's multi-joint nature.

When a Multiarticular Muscle Shortens Such That Lengthening at One