A limb support system for supporting one or more limbs of a patient during surgery is disclosed. The limb support system may include one or more joints formed from electromagnets that move locking mechanisms between locked and unlocked positions to enable a patient's limb to be supported in a desired position. At least one of the joints may be supported by a support arm that is attached to support structure. A limb support device, such as, but not limited to, an armrest or a wrist support may be attached to the housing of the joint.