A medical device for implantation in a hip joint of a patient is provided. The medical device is adapted to be fixated to the pelvic bone of the patient. The medical device comprises an inner and an outer surface, wherein a contacting portion, of said inner surface is spherical and adapted to face the center of the hip joint when said medical device is implanted. The medical device is adapted to receive a caput femur or a prosthetic replacement therefor having a spherical portion, wherein said medical device comprises at least one extending portion, extending said contacting portion of said inner surface such that said at least one extending portion clasps said spherical portion of said caput femur, or a prosthetic replacement therefor, such that said spherical portion is restrained in said medical device. Restraining the caput femur in the medical device reduces the risk that the hip joint dislocates when in use by the patient.

A dual mobility reverse shoulder arthroplasty device for repairing a shoulder articulation, the device comprising: a scapular implant (1), configured to be attached to a scapula of a patient, a humeral implant (2), configured to be attached to the humerus of the patient, a spherical head (3), rigidly mounted on the scapular implant, a mobile head (4), formed as an intermediate cup, mounted on the spherical head with a snap fit assembly manner, the mobile head can rotate with regard to the spherical head about an articulation axis, thereby forming a first inner ball joint assembly, the humeral implant comprising an outer cup (21) configured to bear on the mobile head, forming a second outer ball joint assembly, concentric with the first ball joint, thereby achieving large mobility angles of the humeral implant with respect to the scapular implant, and thereby avoiding mechanical impingement at extremal positions.

A method and system for performing bone fusion and/or securing one or more bones, such as adjacent vertebra, are disclosed. The screws include a threaded tip connected to a main shaft and a threaded outer sleeve that rotates relative to the outer shaft until locked down. Independent rotation of the threaded outer sleeve relative to the threaded distal tip allows compression or distraction to modify the gap between the vertebral bodies. The screws are passed from the inferior to superior vertebra or superior to inferior, for example, through a trans-pedicular route to avoid neurological compromise. At the same time, the path of screw insertion is oriented to reach superior or inferior vertebra. An intervertebral cage of the system is configured for lateral expansion from a nearly straight configuration to form a large footprint in the disc space. The screws and cage may be combined for improved fixation with minimal invasiveness.