An apparatus (1) for treating a body part (5) of a patient (3) is provided. The apparatus comprises a support (7) for at least partially supporting and holding the body part and a manipulator (11) connected to the support for supporting and maneuvering the support. The manipulator comprises a parallel linkage device (13) comprising a plurality of hingedly interconnected linear actuators (19). The the parallel linkage device (11) comprises at least one hinge (21) comprising a, preferably resilient, tendon joint (61). Further, a method, a storage medium and a piece of headgear are provided.
