Shoulder Replacement Surgery

In instances of severe arthritis, advanced joint wear, or complex trauma, shoulder replacement surgery may be recommended to relieve pain and restore function. In this procedure, the damaged parts of the shoulder joint are removed and replaced with prosthetic components, usually made of metal and polyethylene (medical-grade plastic). Depending on the condition of the joint, bone quality, and the state of the rotator cuff, your surgeon may recommend an anatomic total shoulder replacement, a reverse shoulder replacement, or a partial shoulder replacement.

What is shoulder replacement surgery?

The shoulder is a ball-and-socket joint made up of the humeral head (the ball) and the glenoid (the socket). In a healthy shoulder, these surfaces are covered with smooth cartilage that allows painless movement. When cartilage is worn away by arthritis or the joint is badly damaged by injury, the bones can rub together, causing pain, stiffness, weakness, grinding, and loss of motion. Shoulder replacement surgery is designed to replace these damaged joint surfaces with implants that recreate smoother movement and reduce pain.

When is shoulder replacement considered?

Shoulder replacement is usually considered when non-surgical treatment has not provided adequate relief. This may include persistent pain, night pain, loss of range of motion, difficulty with dressing or reaching overhead, weakness, or loss of quality of life despite medication, physiotherapy, activity modification, or injections. Common reasons for surgery include shoulder osteoarthritis, rheumatoid arthritis, cuff tear arthropathy, avascular necrosis, and some complex fractures or fracture sequelae.

Types of shoulder replacement

Anatomic total shoulder replacement

Anatomic total shoulder replacement replaces both the ball and the socket while maintaining the shoulder’s normal anatomy. This option is generally used when the joint is affected by arthritis and the rotator cuff tendons are intact and functioning well. The humeral head is replaced with a metal component, and the glenoid is resurfaced with a plastic socket component.

Reverse shoulder replacement

Reverse shoulder replacement switches the normal ball-and-socket configuration, placing the ball on the shoulder blade side and the socket on the upper arm side. This design allows the deltoid muscle to do more of the work of lifting the arm, which is especially helpful when the rotator cuff is severely torn or no longer functional. Reverse replacement is commonly used for cuff tear arthropathy, irreparable rotator cuff tears with arthritis, some revision cases, and selected fractures.

Partial shoulder replacement (hemiarthroplasty)

Partial shoulder replacement replaces only the ball of the shoulder joint while leaving the socket untouched. This may be considered in selected cases, particularly when the humeral head is damaged but the socket is relatively preserved, although total or reverse replacement is often preferred in many modern indications depending on the pathology.

How the operation is performed

Shoulder replacement is typically performed under general anaesthesia, often with a regional nerve block to assist with postoperative pain control. The operation is usually performed through an incision at the front of the shoulder. The surgeon exposes the joint, removes the damaged bone and cartilage, prepares the humerus and, when required, the glenoid, then inserts and secures the prosthetic components before repairing the soft tissues and closing the wound.

A typical shoulder replacement procedure may include:

• Anaesthesia and positioning, often in a beach-chair position.
• An incision at the front of the shoulder to access the joint.
• Careful exposure of the joint and management of the surrounding soft tissues.
• Removal of the damaged humeral head and preparation of the upper arm bone.
• Preparation of the glenoid if a total or reverse replacement is planned.
• Insertion of the selected implants.
• Assessment of stability, range of motion, implant position, and tension in the surrounding tissues.
• Repair of tendons or soft tissues as required, followed by wound closure.

Benefits of shoulder replacement

The main goals of surgery are pain relief, improved shoulder function, and better quality of life. Many patients also notice improved ability to perform daily activities such as grooming, dressing, reaching cupboards, and sleeping more comfortably. Outcomes depend on the diagnosis, implant type, tissue quality, bone condition, and commitment to rehabilitation.

Risks and complications

As with any major orthopaedic procedure, shoulder replacement carries potential risks. These include infection, bleeding, stiffness, instability or dislocation, nerve or blood vessel injury, fracture, implant loosening or wear over time, persistent pain, and the possibility of future revision surgery. In reverse shoulder replacement, there are also specific implant-related complications that your surgeon will discuss if relevant to your case.

Recovery and rehabilitation

Recovery after shoulder replacement is gradual and guided by the type of replacement performed and the quality of the soft tissues. Most patients use a sling initially, begin early guided movement as advised by their surgeon and physiotherapist, and then progress through a structured rehabilitation program focused on regaining motion, strength, and functional use of the arm. Improvement continues over a period of months, and full recovery commonly takes several months rather than several weeks.

A general recovery pathway may include:

• Early protection in a sling with pain management and gentle movement exercises.
• Supervised physiotherapy to restore range of motion.
• Gradual strengthening once healing allows.
• Progressive return to daily activities, with timelines tailored to the procedure and patient goals.

Is shoulder replacement right for you?

The best procedure depends on the exact cause of your shoulder pain, the severity of joint damage, your age and activity level, bone quality, and whether the rotator cuff is intact. A detailed consultation, examination, and imaging review help determine whether conservative treatment remains appropriate or whether a shoulder replacement is likely to offer the best long-term result.