Shoulder replacement surgery, also known as shoulder arthroplasty, is a procedure that replaces damaged parts of the shoulder joint with artificial components. It is typically performed to relieve pain and restore mobility in cases of severe arthritis, fractures, or degenerative conditions.
Depending on the extent of damage, the surgery may involve total shoulder replacement, where both the ball (humeral head) and socket (glenoid) are replaced, or partial replacement, which focuses on replacing only the affected areas of the joint. Some patients may require reverse total shoulder replacement, a specialised approach designed for those with severe rotator cuff damage.
Shoulder replacement is considered when non-surgical treatments, such as medication, physiotherapy, or injections, no longer provide adequate relief. It is most commonly recommended for the following conditions:
Severe Arthritis: Osteoarthritis and rheumatoid arthritis can progressively wear down the cartilage in the shoulder joint, leading to persistent pain, stiffness, and restricted movement. When pain becomes constant and everyday activities become difficult, surgery may be an option.
Complex Shoulder Fractures: Severe fractures, particularly those where the bone is shattered or misaligned, may not heal properly with conventional treatment. In such cases, replacing the damaged joint can restore function and prevent long-term complications.
Rotator Cuff Tear Arthropathy: A combination of extensive rotator cuff damage and arthritis can weaken the shoulder, making it difficult to lift the arm. Shoulder replacement can help restore movement and alleviate discomfort.
Avascular Necrosis (Osteonecrosis): When the blood supply to the shoulder bone is disrupted, the bone tissue gradually dies, leading to joint collapse. Shoulder replacement can help prevent further deterioration and improve function.
For individuals who have not found relief through other treatments, shoulder replacement can provide significant improvements in daily life.
Pain Reduction: Chronic shoulder pain that interferes with sleep, work, and daily tasks is often alleviated or significantly reduced after surgery.
Better Mobility: Many patients regain a greater range of motion, allowing them to perform tasks such as reaching overhead, lifting objects, or dressing with greater ease.
Improved Shoulder Strength: With pain relief and better joint mechanics, muscle function often improves, making it easier to perform everyday activities.
Restored Daily Function: Activities such as personal care, cooking, and recreational exercises become easier to manage without persistent discomfort.
The appropriate type of shoulder replacement depends on the condition of the joint, the extent of damage, and the overall function of the surrounding muscles.
Total Shoulder Replacement
This procedure involves replacing both the ball and socket of the joint with artificial components. A metal ball is secured to a stem placed inside the arm bone, and a plastic socket is attached to the shoulder blade. This method is ideal for patients with severe arthritis and intact rotator cuff muscles.
Reverse Total Shoulder Replacement
In this approach, the ball and socket positions are reversed – the ball is placed on the shoulder blade, and the socket is positioned on the arm bone. This technique allows other muscles, such as the deltoid, to take over arm movement, making it suitable for individuals with both arthritis and severe rotator cuff damage.
Partial Shoulder Replacement (Hemiarthroplasty)
In cases where only the humeral head (ball) of the joint is damaged, a partial replacement is performed. The natural socket is preserved, allowing for more natural movement while reducing pain. This approach is often recommended for certain fractures or cases where arthritis is limited to the ball portion of the joint.
Thorough preparation before surgery helps ensure a smoother procedure and recovery. This includes medical assessments, adjusting medications, and imaging studies to guide surgical planning.
Medical Evaluation and Testing
A full medical assessment is conducted before surgery, including blood tests, chest X-rays, and an ECG to check for any underlying conditions that may affect the procedure. A review of medications and medical history is also necessary.
Adjusting Medications
Certain medications, particularly blood thinners, may need to be adjusted or paused before surgery to reduce the risk of excessive bleeding. Patients should discuss all current medications with their doctor well in advance.
Pre-operative Imaging
Detailed imaging, including X-rays, CT scans, or MRI scans, is used to assess the extent of joint damage and structural changes in the shoulder. These scans provide precise measurements, helping the surgical team select the appropriate implant size and positioning to ensure optimal fit, alignment, and long-term function.
Anaesthesia and Positioning
The procedure is performed under either general anaesthesia, which puts the patient to sleep, or a regional nerve block, which numbs the shoulder while allowing the patient to remain awake. Once anaesthesia takes effect, the patient is positioned in a semi-reclined posture to provide the surgeon with clear access to the shoulder joint.
Surgical Access and Bone Preparation
A 10–15 cm incision is made at the front of the shoulder. The surgeon carefully moves muscles and soft tissues aside to expose the joint while taking precautions to protect nearby nerves and blood vessels. Damaged bone and cartilage are then removed, and the remaining bone is reshaped to create a stable foundation for the new implant.
Implant Placement and Joint Testing
The artificial components are inserted and secured using either cemented fixation, which bonds the implant to the bone, or press-fit techniques, which allow natural bone growth to secure the implant over time. Once in place, the surgeon tests the joint’s range of motion to confirm proper alignment and functionality. After ensuring a stable fit, the incision is closed with sutures or staples, and a sterile dressing is applied to protect the surgical site.
Immediate Care
After surgery, patients are closely monitored in a recovery area for several hours before being moved to a hospital room. Pain management begins immediately with medication, and the arm is placed in a sling to support healing and prevent unnecessary movement. Most patients stay in the hospital for 2-3 days, during which they will be helped with mobility and given advice on post-operative care.
Early Rehabilitation and Home Recovery
At home, recovery focuses on protecting the shoulder while gradually restoring movement. The sling is worn for 4–6 weeks, and physiotherapy begins the day after surgery with gentle exercises to prevent stiffness. Light daily activities can usually resume within three months, while full recovery takes 6–12 months, supported by ongoing physiotherapy to rebuild strength and mobility.
Follow-up Appointments
Regular follow-up appointments help monitor healing and ensure the shoulder is recovering as expected. Sutures or staples are typically removed after 10–14 days, and activity levels are gradually increased based on progress. The surgeon provides ongoing guidance to support a safe and effective recovery.
As with any surgery, shoulder replacement carries some risks, though complications are uncommon. Infection occurs in less than 1% of cases and may require treatment. Blood clots can develop but are minimised with mobility exercises and medication. Artificial components may wear out or loosen over time, sometimes requiring revision surgery. Temporary nerve-related stiffness or weakness may occur but usually improves with physiotherapy.
Shoulder replacement surgery can significantly improve quality of life for individuals experiencing persistent pain and mobility issues that have not responded to other treatments. By restoring joint function, reducing discomfort, and enhancing movement, this procedure enables patients to regain independence in daily activities. Recovery requires patience, rehabilitation, and gradual strengthening, but most individuals achieve long-term benefits.
If you are considering shoulder replacement surgery, schedule a consultation today to discuss your options and determine the best course of action for your condition.
MBBS (S’pore)
MRCS (Ireland)
MMed (Ortho)
FRCSEd (Ortho)
Dr Kau (许医生) is a Fellowship trained Orthopaedic Surgeon with a subspecialty interest in Hip and Knee surgery and has been in practice for more than 15 years.
He is experienced in trauma and fracture management, sports injuries, and joint replacement surgery.
If you have any enquiry, please do get in touch. Leave us a message and we will get back to you shortly.
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