Quick Answer
A reverse shoulder replacement reverses the ball-and-socket configuration of the shoulder prosthesis. This allows the deltoid to power the arm when the rotator cuff is no longer functional. It may be considered for irreparable massive rotator cuff tears with cuff-tear arthropathy, selected failed shoulder replacements, complex fractures and some chronic dislocations.
Who May Be a Candidate?
- Irreparable massive rotator cuff tear with associated shoulder arthritis
- Severe pain and major loss of arm elevation
- A failed previous shoulder replacement
- Selected complex proximal humerus fractures
- Some chronic dislocations or other complex reconstructive situations
Preoperative Assessment
Examination evaluates pain, motion, deltoid and nerve function. X-rays are the basic imaging study; CT may help define glenoid anatomy and bone stock, while MRI or ultrasound may be used when soft-tissue information is needed. General health, infection risk, bone quality and patient expectations are part of planning.
How Does the Operation Work?
In a conventional replacement, the humeral side carries the metal ball and the glenoid carries the socket. In a reverse replacement, the metal ball is fixed to the glenoid and the plastic socket to the humerus. The geometry increases the mechanical advantage of the deltoid. Implant choice and technique are tailored to anatomy.
Recovery and Rehabilitation
AAOS patient information notes that some patients can go home the same day while others stay overnight. The arm is usually protected in a sling early on and exercises progress according to the procedure performed. Extreme arm positions and heavy lifting may be restricted during the early healing period. Final motion and strength depend on preoperative function, deltoid performance, bone/soft-tissue quality and rehabilitation.
Possible Risks
General surgical risks include bleeding, infection and nerve injury. Prosthesis-specific risks include instability/dislocation, implant loosening or wear, fracture around the implant and possible revision surgery. Risk varies by age, bone quality, previous surgery and procedural complexity; one complication percentage does not apply to every patient.
Activity Expectations
The goal is usually meaningful pain relief and improved use of the arm in daily life. A reverse replacement does not recreate a normal young shoulder. Repetitive heavy lifting, collision sports or activities that place high loads on the implant should be discussed with the surgeon.
Frequently Asked Questions
Why is a reverse replacement different?
When the rotator cuff is severely deficient, conventional shoulder mechanics may not work well. The reverse design allows the deltoid to contribute more effectively to arm elevation.
How long does the implant last?
Modern reverse replacements have encouraging mid- and long-term results, but no single lifespan can be guaranteed. Age, activity, implant position, bone quality and complications all matter.
Will the shoulder become completely normal?
Pain and function often improve substantially, but motion does not return to normal in every patient. Some rotational limitation can persist.
Sources
This page is for general patient education and does not replace an individual medical examination or treatment plan.
Evidence sources checked: 7 August 2026.