There are different types of shoulder replacements.
Your surgeon will evaluate your situation carefully and discuss with you
which type of replacement would best meet your needs.
A typical total shoulder replacement involves replacing the arthritic
joint surfaces with a highly polished metal ball attached to a stem, and
a plastic socket. These components come in various sizes and may be
either cemented or press-fit into the bone.
In reverse total
shoulder replacement, the socket and metal ball are switched, so the
metal ball is attached to the shoulder bone and a plastic socket is
attached to the upper arm bone. This allows the patient to use the
deltoid muscle instead of the torn rotator cuff to lift the arm. This is
typically recommended for patients with: completely torn rotator cuffs
with severe arm weakness; effects of severe arthritis and rotator cuff
tearing (cuff tear arthropathy); or a previous shoulder replacement that
has failed. For these individuals, a conventional total shoulder
replacement can still leave them with pain or an inability to raise
their arm past a 90-degree angle, which can be severely debilitating.
Bone & Joint Center