A pivot mechanism for a joint support has a connector, a first support and a second support. The connector has multiple slots. The first support and the second support are mounted pivotally in the connector and rotate synchronously, and each has a protrusion. The protrusions are adjusted to mount in the slots of the connector and to limit an angle between the first and second support to a determined range. Then, the pivot mechanism is attached around a joint of a patient to limit joint movement within the determined range, which can be adjusted easily during rehabilitation.
