Abstract: A finger joint prosthesis for MP joint or PIP joint in which a socket has an opening at a portion thereof and a spherical face on an inner side thereof and is integrally formed with a stem on a side opposed to the opening, a head has a spherical portion fit to the spherical face via the opening and is integrally formed with a stem extending outwardly from the opening and a sheath for surrounding the stem of either of the socket and head is provided and the stem is movable slidably in an axial direction by adhering and fixing the sheath to a narrow cavity at a nearly disposed portion or a remotely disposed portion whereby the joint prosthesis is matched with motional characteristic of finger.

Abstract: A device for carrying out motional training by continuously flexing and extending a joint of the body comprises a mounting piece for mounting the device in the vicinity of a joint, a drive unit arranged on the mounting piece including a reversable rotation motor having a motor output shaft, a manual switching clutch connected to the motor output shaft, a power transmission connected to the motor output shaft and a transmission output rotating shaft, a swinging arm having a base portion mounted on the mounting piece, and a free end portion of the device including another mounting piece for mounting the free end side of the device to a portion of the shaft body in front of a joint. The swinging arm is coupled to the transmission output rotating shaft and subjected to a reciprocating swing motion during regular and reverse rotation of the transmission output rotating shaft. A movable range setting copying mechanism sets the first swing end and the second swing end of the swing arm.