Hip joint device

A method for implantation at least one medical device in a hip joint of a patient, the hip joint having a caput femur integrated with a collum femur having a center axis extending longitudinal along the collum and caput femur in the center thereof, wherein the collum femur is placed more distal than caput femur, wherein;

• said medical device system comprises two or more medical devices, wherein each of the medical devices comprising:
• an artificial caput femur surfaces being hollow, having a major opening adapted to be directed distally, when said medical device is implanted, wherein said artificial caput femur surface is adapted to replace a caput femur hip joint surface, further having;
• a medical device caput center axis passing through said major opening, being aligned with the caput femur center axis, when said medical device is implanted in a functional position in the hip joint, wherein said medical device comprises a central part and a surrounding part, the central part being aligned with the medical device center axis and the surrounding part surrounding the surface of the caput femur not including the central part, and wherein said medical device further comprises;
• an inner surface adapted to have a first distal distance extending perpendicularly from said medical device caput center axis to said inner surface of the surrounding part of said artificial caput femur surface, said first distal distance being shorter than a second proximal distance extending perpendicularly from said medical device caput center axis to said inner surface of said artificial caput femur surface, said second proximal distance extending from a more proximal position on said medical device caput center axis than said first distal distance, being the second proximal distance, when said artificial caput femur surface is implanted in said functional position in the hip joint, and
• a locking member for implantation in a hip joint of a patient, wherein said locking member is adapted to assist in the fixation of said medical device to the collum and/or caput femur, wherein said locking member comprises an element adapted to lock said artificial caput femur surface such that the caput femur remains clasped and restrained in said artificial caput femur surface, wherein at least one of said artificial caput femur surfaces has a size adapted to replace the caput femur hip joint surface of a corresponding size, wherein the method includes the step of;
• surgically or arthroscopically implanting two or more artificial caput femur surfaces to find the right size to lock onto the caput femur.