THREE-KNUCKLE

TEST

​​• Testing for

The available active range of depression of the mandible or TMJ hypomobility.

​• Action

Instruct the client to open their jaw.

Ask them to insert as many of their own flexed proximal interphalangeal joints of the non-dominant hand between their teeth.

​• Positive finding

The client can only get one knuckle or knuckles between their teeth.