Hip joint and method
A medical device for implantation in a hip joint of a human patient is provided. The natural hip joint having a ball shaped caput femur as the proximal part of the femoral bone with a convex hip joint surface towards the centre of the hip joint and a bowl shaped acetabulum as part of the pelvic bone with a concave hip joint surface towards the centre of the hip joint. The caput femur has a centrally placed longitudinal extension, extending through the center of the caput and collum femur, aligned with the collum femur, defined as the caput and collum femur center axis. The medical device comprising; an artificial acetabulum, comprising a concave surface towards the centre of the hip joint. The artificial concave acetabulum is adapted to, when implanted, be fixated to the femoral bone of the human patient, and be in movable connection with an artificial caput femur fixated to the pelvic bone of the patient.
1 - 47 . (canceled)
48 . A method of replacing a natural hip joint with an artificial hip joint, the method comprising the steps of:
a. exposing the caput femur,
b. opening the caput femur, thereby exposing the cortical and cancellous bone of the caput femur,
c. placing a medical device comprises an artificial concave acetabulum surface in the caput femur, and
d. fixating the medical device to the caput femur or collum femur.
49 . The method according to claim 48 , wherein the step of fixating the medical device to the caput or collum femur, comprises fixating the medical device to the cortical bone from the inside of the caput or collum femur.
50 . The method according to claim 48 , wherein the step of fixating the medical device to the caput or collum femur, comprises fixating the medical device to the cortical bone from the outside of the caput or collum femur.
51 . The method according to claim 48 , wherein the step of fixating the medical device to the caput or collum femur, comprises fixating the medical device to the cortical bone from the proximal side of the caput or collum femur.
52 . The method according to claim 49 , wherein the step of fixating the medical device further comprises fixating the medical device to the cortical bone from the outside of the caput or collum femur.
53 . The method according to claim 49 , wherein the step of fixating the medical device further comprises fixating the medical device to the cortical bone from the proximal side of the caput or collum femur.
54 . The method according to claim 50 , wherein the step of fixating the medical device further comprises the step of fixating the medical device to the cortical bone from the proximal side of the caput or collum femur.
55 . The method according to claim 48 , wherein the medical device comprises an elastic portion, and wherein the step of fixating the medical device comprises fixating the medical device to the caput femur by said medical device clasping the caput femur using the elastic portion.
56 . The method according to claim 48 , wherein the medical device further comprises an elongated member, and wherein the step of fixating the medical device comprises placing the elongated member in the collum femur, substantially aligned with the caput and collum femur center axis, said elongated member engaging at least one of: the cancellous bone of the collum femur, the cortical bone of the collum femur and an artificial material placed inside of the collum femur.
57 . The method according to claim 56 , wherein the elongated member comprises a threaded portion, and wherein the step of placing the elongated member in the collum femur comprises the step of screwing the elongated into the collum femur.
58 . The method according to claim 56 , wherein the elongated member comprises an anchoring portion, and wherein the step of placing the elongated member in the collum femur comprises the step of placing the anchoring portion such that the anchoring portion engages at least one of: the cancellous bone of the collum femur, the cortical bone of the collum femur and an artificial material placed inside of the collum femur.
59 . The method according to claim 58 , wherein the anchoring portion can be placed in a first and second state, and wherein said anchoring portion is adapted to, in the second state, further engage at least one of: the cancellous bone of the collum femur, the cortical bone of the collum femur and an artificial material placed inside of the collum femur, for further stabilizing the medical device.
60 . The method according to claim 48 , wherein the step of fixating the medical device further comprises applying an adhesive to a surface of the inside of the caput or collum femur and placing the medical device in contact with said adhesive, such that said adhesive adheres to the medical device.
61 . The method according to claim 48 , wherein the step of fixating the medical device comprises the step of fixating the medical device using a mechanical fixation element adapted to engage the cortical bone of the caput or collum femur.
62 . The method according to claim 48 , wherein the step of fixating the medical device comprises the step of fixating the medical device using a mechanical fixation element adapted to engage the cortical bone of the caput or collum femur.
63 . The method according to claim 48 , wherein the step of fixating the medical device comprises placing a mechanical fixation element in connection with the medical device, clamping the medical device, and thus fixating the medical device to the caput femur.
64 . The method according to claim 63 , wherein the step of placing the mechanical fixation element comprises the step of placing a loop shaped mechanical fixation element surrounding the medical device and caput femur.
65 . The method according to claim 48 , wherein the step of fixating the medical device to the caput or collum femur, comprises fixating the medical device to the cortical bone of caput or collum femur from at least one of; the outside, the inside and a proximal cut caput or collum femur and operating the device to adjust the fixation to clamp the cortical bone of the caput or collum femur.