Shoulder Joint Implant Description

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ShoulderJoint Implant Description

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ShoulderJoint Implant Description

Inthe surgery of replacing the shoulder joint, the spoiled parts of theshoulder are usually removed. The removed parts are subsequentlyreplaced with the artificial components known as a prosthesis. Theoptions for treatment are either the replacement of the ball, whichis the head of the humerus bone, or replacing both the glenoid(socket) and the ball.

Figure1: Shoulder joint replacement

Theimplant for replacing the entire AC joint is called total shoulderjoint replacement while replacing the ball only is calledhemiarthroplasty. The implants necessary for shoulder jointreplacement are the humeral implant and the glenoid implant. However,this paper describes the humeral component as the shoulder jointimplant.

Humeralshoulder joint implant

Thehumeral component usually supplants the head of the humerus. It oftenconsists of the chromium or the cobalt-based alloys. It has a ball,which is round. The ball is usually attached to the stem, which canbe implanted into the bone. The humeral device comes in differentsizes, and it sometimes has a modular unit or a single piece. Thedevice is implanted under either the general or the regionalanesthesia, depending on the case specifics. The surgeon usuallymakes an incision of about 7.6 to 10.2 cm on the front part of theshoulder, from the collarbone up to where the deltoid attaches to thehumerus. The only portion of the head removed is the one covered withthe articular cartilage.

Figure2: The Humeral Implant

Thehumeral shaft is then cleaned and then enlarged with the reamers ofthe size that is gradually increasing, to make a cavity that matchesthe implant stem shape. The upper end of the bone is usually smoothedto enable the stem to be inserted flush with the surface of the bone.

Figure3: An inserted Humeral implant in a shoulder

Reference

http://www.encyclopedia.com/doc/1G2-3406200411.html,Retrieved 1 January 2016, ShoulderJoint Replacement.

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