For a membrane encapsulated joint implant sealed under vacuum, a joint implant includes an outer cup, an inner cup, a joint head, a joint membrane, a lubricant, and an implant stem. The outer cup attached at a proximal bone. The nests within the outer cup and receives a joint head, the inner cup comprising an inner cup rim. The joint head is disposed within the inner cup and forms a bearing that rotates within the inner cup. The joint membrane sealed to the inner cup rim and vacuum seals the joint head within the inner cup to form a capsular space. The lubricant is disposed within the capsular space. The implant stem that is attached to a distal bone and that attaches through the joint head through the joint membrane.

A reverse hip prosthesis include an acetabular cup arrangement configured for insertion into an acetabulum of a patient and fixation therein, an acetabular ball configured for threaded attachment to the acetabular cup arrangement, a femoral stem configured for insertion into an intramedullary femoral canal of the patient, and a femoral cup arrangement configured for attachment to the femoral stem and to operatively receive the acetabular ball therein. The acetabular cup arrangement includes an anchor portion which becomes fixed to the patient's acetabulum and is the largest size suitable for the patient, and an insert which comes in different sizes and are connectable to the anchor portion, so that the most appropriate insert for the patient may be used. The acetabular cup arrangement and ball are interconnected with a threaded stem that also functions as an artificial Ligamentum Teres.

Apparatus and method of removing a liner attached to an implanted acetabular shell. A surgical site is accessed where the acetabular shell has already been implanted into a patient. A rim plate having a through opening is placed over the acetabular shell. A pilot hole is then drilled into the attached liner through the opening in the placed rim plate. After the drilling, the rim plate is removed to expose the drilled hole. A removal tool is inserted into the drilled pilot hole. The attached liner is then disengaged from the implanted acetabular shell with the inserted removal tool.

An acetabular implant for hip arthroplasty includes an acetabular shell to be attached to an acetabulum. The acetabular shell includes an inner surface defining a shell cavity and having a tapered shell section. The acetabular shell includes a tool interlocking structure that mates with a shell insertion tool to inhibit rotation relative to the shell insertion tool. The acetabular shell includes a snap-fit receiver. An acetabular liner is sized and shaped to be disposed in the shell cavity of the acetabular shell. The acetabular liner including an outer surface having a tapered liner section corresponding to the taper of the tapered shell section and engages the tapered shell section to inhibit movement of the acetabular liner relative to the acetabular shell. The acetabular liner includes a snap-fit retainer received by the snap-fit receiver of the acetabular shell to form a snap-fit connection between the acetabular liner and the acetabular shell.

An acetabular shell liner for use in a hip arthroplasty surgical procedure is disclosed. The acetabular shell liner includes a semi-hemispherical inner bearing layer, which includes a rim and a dome attached to the rim. The semi-hemispherical inner bearing layer includes a polymeric material having a first thickness, at an apex of the dome, and a second thickness, at the rim, that is less than the first thickness. Additionally, the acetabular shell liner includes a semi-hemispherical outer reinforcement layer mated with and encasing the dome of the semi-hemispherical inner bearing layer. The semi-hemispherical outer reinforcement layer includes a metallic material to provide structural support to the semi-hemispherical inner bearing layer.

An acetabular hip implant and method includes an acetabular shell component having a first feature and a first insert having a second feature that cooperates with the first feature of the acetabular shell component and further includes a third feature. The implant further includes a second insert having a fourth feature that cooperates with the third feature of the first insert and further includes a fifth feature. A femoral head component includes a sixth feature that cooperates with the fifth feature. Interaction between the first and second features, between the third and fourth features, and between the fifth and sixth features mechanically constrains the acetabular hip implant to prevent dislocation of the femoral head during rotation.

An orthopaedic implant includes: an implant body having an outer surface; and a textured porous material attached to the outer surface and having a plurality of pores and a plurality of islands extending away from the outer surface, the plurality of islands being configured to shear biological tissue during implantation.

An acetabular hip implant includes an acetabular shell component having a first feature and a first insert having a second feature that cooperates with the first feature of the acetabular shell component and further includes a third feature. The implant further includes a second insert having a fourth feature that cooperates with the third feature of the first insert and further includes a fifth feature. A femoral head component includes a sixth feature that cooperates with the fifth feature. Interaction between the first and second features, between the third and fourth features, and between the fifth and sixth features mechanically constrains the acetabular hip implant to prevent dislocation of the femoral head during rotation.

An acetabular component anteversion and abduction measurement system, comprising: an acetabular component; one or more radiopaque guide lines disposed on or adjacent to a posterior surface of the acetabular component; and one or more radiopaque guide lines disposed on or adjacent to an anterior surface of the acetabular component; wherein predetermined alignment of selected of the one or more anterior guide lines with selected of the one or more posterior guide lines under intra-operative fluoroscopy or radiography indicates proper surgical alignment of the acetabular component within the anatomy of a patient. Proper surgical alignment means that the acetabular component is not retroverted or overly anteverted or abducted within the anatomy of the patient.

Apparatus and method of removing a liner attached to an implanted acetabular shell. A surgical site is accessed where the acetabular shell has already been implanted into a patient. A rim plate having a through opening is placed over the acetabular shell. A pilot hole is then drilled into the attached liner through the opening in the placed rim plate. After the drilling, the rim plate is removed to expose the drilled hole. A removal tool is inserted into the drilled pilot hole. The attached liner is then disengaged from the implanted acetabular shell with the inserted removal tool.