Reverse Shoulder Replacement
Reverse Shoulder Replacement (RSA) in Houston
Reverse shoulder replacement is a transformative procedure for patients whose shoulders cannot be addressed with anatomic replacement—most commonly those with a worn-out rotator cuff who can no longer lift the arm reliably. By switching the orientation of the ball and socket, the procedure allows the deltoid muscle (the large muscle on the outside of the shoulder) to power the arm in place of the cuff.
Why "Reverse"
In a normal shoulder, the ball is on the humerus and the socket is on the scapula. The rotator cuff—the group of four tendons that surround the joint—keeps the ball centered on the socket so the deltoid can lift the arm.
When the rotator cuff is irreparably torn, the ball migrates upward and the deltoid loses its mechanical advantage. A reverse replacement flips this anatomy: a metal ball is fixed on the scapula (glenoid) side, and a socket replaces the humeral head. This new geometry allows the deltoid to lift the arm without needing the rotator cuff to keep the ball in place.
Who Is a Candidate
The most common indications for reverse shoulder replacement include:
- Rotator cuff tear arthropathy. Long-standing massive rotator cuff tears that have led to glenohumeral arthritis, with upward migration of the humeral head and erosion of the acromion.
- Massive irreparable rotator cuff tears causing significant pain and weakness, particularly in older patients, even without significant arthritis.
- Complex proximal humerus fractures in older patients, where reverse replacement may produce more reliable function than fixation or hemiarthroplasty.
- Revision shoulder replacement for failed anatomic replacements, instability after prior surgery, or implant loosening.
- Inflammatory arthritis with severe rotator cuff involvement.
- Severe glenoid bone loss that would compromise anatomic replacement.
Implant Design
Reverse shoulder systems have evolved substantially over the past two decades. Modern implants offer flexibility in:
- Glenoid baseplate fixation, with screws into solid scapular bone
- Glenosphere (ball) size and offset, allowing the surgeon to optimize tension and motion
- Humeral component design, including stemmed, short-stem, and stemless variants
- Implant material and bearing surface options to address bone quality and longevity
Implant selection is part of the pre-operative planning and is tailored to each patient's anatomy and bone quality.
How the Procedure Works
Reverse shoulder replacement is performed under general anesthesia, typically combined with a regional nerve block.
- Surgical approach. An incision is made on the front of the shoulder using a deltopectoral approach.
- Joint exposure. The shoulder joint is exposed and the rotator cuff status is confirmed.
- Humeral cut. The worn humeral head is removed.
- Glenoid preparation and baseplate fixation. The glenoid is reshaped and a metal baseplate is fixed with screws into the strongest bone of the scapula.
- Glenosphere placement. A metal ball (glenosphere) is fixed to the baseplate.
- Humeral component placement. The humeral side socket is placed with or without a stem, depending on the implant and bone quality.
- Trial and balance. The shoulder is trialed to confirm proper deltoid tension, stability, and range of motion.
- Final implants and closure. Final components are placed and the incision is closed.
The procedure typically takes approximately two hours.
Outpatient Reverse Shoulder Replacement
For appropriate candidates, reverse shoulder replacement can be performed as outpatient surgery, allowing the patient to recover at home the same day. Suitability depends on overall health, home support, and pre-operative readiness. Dr. Gregory has helped lead and publish national work on outpatient shoulder arthroplasty protocols.
Recovery Timeline
Recovery after reverse shoulder replacement is staged carefully to protect the implant and rebuild deltoid function.
Weeks 0–6: Protection Phase
- Sling for protection during early healing
- Passive range-of-motion exercises with a therapist
- No active lifting or resistance with the operated arm
- Ice and oral pain medications
Weeks 6–12: Motion Phase
- Sling is discontinued
- Active range of motion begins
- Light activities of daily living resume
Months 3–6: Strengthening Phase
- Progressive deltoid and surrounding-muscle strengthening
- Resumption of most non-strenuous activities
After 6 Months
- Continued improvement in strength through the first year
- Long-term activity restrictions—particularly heavy resistance overhead loading—help protect implant longevity
Outcomes
For appropriately selected patients, reverse shoulder replacement provides reliable pain relief and substantial improvement in function—including the ability to lift the arm overhead, which is often dramatically limited before surgery. Modern implants typically function well for fifteen to twenty years or longer.
Further patient education is available in this handout.
Houston Locations and Scheduling
Reverse shoulder replacement is performed at hospitals and outpatient surgery centers in Houston affiliated with UTHealth Houston and Memorial Hermann. Office consultations are available at Memorial Villages and Texas Medical Center locations.
Appointments are scheduled through UTHealth Houston at 713-486-1700.
Frequently asked questions
What is reverse shoulder replacement?
Reverse shoulder replacement (RSA) inverts the normal anatomy of the shoulder—a metal ball is fixed to the glenoid (socket side) and a socket replaces the humeral head. This design allows the deltoid muscle to lift the arm when the rotator cuff is deficient or absent.
When is reverse shoulder replacement recommended?
The most common indications are rotator cuff tear arthropathy (arthritis associated with a massive irreparable rotator cuff tear), massive irreparable cuff tears with significant weakness, certain complex proximal humerus fractures, and many revision shoulder replacements.
How is it different from anatomic shoulder replacement?
Anatomic shoulder replacement recreates the normal ball-and-socket configuration and depends on a functional rotator cuff. Reverse replacement reverses this configuration and depends on the deltoid muscle instead, allowing the shoulder to function even without a working rotator cuff.
Can reverse shoulder replacement be performed as outpatient surgery?
For appropriate candidates, yes. Modern anesthesia, regional nerve blocks, and structured recovery protocols allow many reverse replacements to be performed as same-day surgery. Suitability is determined in consultation with each patient.
How long is recovery after reverse shoulder replacement?
A sling is worn for several weeks, motion is restored gradually, and most patients return to most non-strenuous activities within three to six months. Strength continues to improve through the first year.
How long does a reverse shoulder replacement last?
Most modern implants are expected to function well for fifteen to twenty years or longer. Activity restrictions—particularly heavy resistance overhead lifting—help preserve longevity.
Will I be able to lift my arm overhead after reverse replacement?
Most appropriately selected patients regain the ability to lift the arm overhead, which is often a substantial improvement compared to their pre-operative function when the rotator cuff is severely deficient.