Comparing your options
Reverse vs anatomic shoulder replacement
Two replacement designs for two different shoulders. Anatomic replacement preserves the natural mechanics of the joint; reverse replacement inverts them. The right choice depends mostly on the state of your rotator cuff.
The two designs
How each replacement works
Anatomic shoulder replacement replaces the worn ball with a metal humeral head and the worn socket with a polyethylene glenoid component, preserving the natural ball-and-socket relationship. The deltoid and rotator cuff continue to do the work of moving the arm, just as they did before the joint wore out. It depends on a working rotator cuff to lift and rotate the arm, so it is only used when the cuff is intact.
Reverse shoulder replacement inverts the joint geometry. A metal ball is fixed to the glenoid (where the socket was) and a polyethylene cup is attached to the humerus (where the ball was). This shifts the centre of rotation and gives the deltoid muscle a mechanical advantage that lets it lift the arm without needing the rotator cuff. It is the answer for shoulders where the cuff is gone or unrepairable.
Side by side
How the two compare
| Anatomic | Reverse | |
|---|---|---|
| Joint geometry | Natural ball-and-socket preserved | Inverted: ball on socket, cup on humerus |
| Powered by | Rotator cuff + deltoid | Deltoid alone (cuff not required) |
| Best suited for | Younger patients with primary OA, intact rotator cuff, and reasonable bone stock | Cuff tear arthropathy, irreparable cuff tears, complex proximal humerus fractures, failed anatomic replacement |
| Active forward elevation | Excellent if cuff functions | Reliable, less dependent on cuff |
| Internal rotation | Generally better preserved | Can be limited (reaching behind back) |
| Hospital stay | Two nights typically | Two nights typically |
| Sling time | Six weeks | Two weeks |
| 10-year revision rate (NJRR) | Comparable, design-dependent | 3.4% (Comprehensive system) |
| Main risks | Glenoid loosening, secondary cuff failure, instability | Scapular notching, dislocation, acromial stress fracture |
Source: AOA NJRR 2025 Annual Report · data period to 31 December 2024.
How the decision is made
How Dr Piper chooses between them
The dominant factor is the rotator cuff. Everything else is secondary.
- Cuff status on MRI. An intact, well-muscled cuff with no significant fatty infiltration favours anatomic replacement. A torn, retracted, or atrophied cuff with significant fatty infiltration favours reverse. An anatomic replacement in this setting would loosen quickly because the cuff cannot centre the ball on the socket.
- Glenoid bone stock and wear pattern. CT scan in the planning workup shows the socket geometry. Severe asymmetric wear or significant bone loss can shift the decision toward reverse, where the design is more forgiving.
- Patient age and demand. Younger, higher-demand patients with intact cuffs are classically anatomic. Older patients (typically 70+) with cuff insufficiency are classically reverse. The middle ground is where careful judgement matters most.
- Specific diagnosis. Cuff tear arthropathy, irreparable cuff tears with pseudoparalysis, and complex proximal humerus fractures in older patients are clear reverse indications regardless of age. Inflammatory arthritides need their own assessment.
The full picture is built from history, examination, x-rays, MRI, and CT before the decision is made. National registry data confirms that both replacements perform well over time when used in the right patients. The key is patient selection.
Read more
Detailed procedure pages
Each procedure has its own page with the full operative detail, recovery timeline, and risk profile.
Subspecialty interest
Reverse shoulder replacement
The most common shoulder replacement performed in Australia, and a growing subspecialty interest of Dr Piper's. Restores function in cuff-deficient shoulders.
Procedure
Anatomic shoulder replacement
Resurfacing of the worn shoulder joint with anatomic implants. The right choice for arthritis with an intact rotator cuff.
FAQ
Frequently asked questions
- Which is better, anatomic or reverse shoulder replacement?
- Neither is universally better. The right replacement depends on the state of your rotator cuff. Anatomic shoulder replacement preserves the natural ball-and-socket relationship and works best when the rotator cuff is intact. Reverse shoulder replacement inverts the joint mechanics and works without a functional cuff. The decision is made on imaging (particularly MRI) and the clinical assessment of cuff strength.
- When is reverse shoulder replacement the right choice?
- Reverse shoulder replacement is the right choice for arthritis combined with a torn or non-functional rotator cuff (cuff tear arthropathy), for irreparable rotator cuff tears causing pseudoparalysis, for some complex proximal humerus fractures in older patients, and for failed previous shoulder replacements. It is now the most common shoulder replacement performed in Australia.
- When is anatomic shoulder replacement the right choice?
- Anatomic shoulder replacement is the right choice for primary osteoarthritis with an intact, working rotator cuff and reasonable glenoid bone stock. It preserves the natural shoulder mechanics and tends to deliver excellent active range of motion, particularly internal rotation behind the back. In the right patient, it is a durable solution that works well for many years.
- How long does each replacement last?
- Modern shoulder replacements perform well over many years. The Australian Orthopaedic Association National Joint Replacement Registry (AOA NJRR) tracks revision rates for both designs. The Comprehensive humeral stem and Comprehensive Reverse glenoid combination, which Dr Piper uses, has a 10-year cumulative revision rate of 3.4 percent. Anatomic replacements with intact cuffs perform similarly. Most patients have a single, lasting replacement.
- What is the recovery like for each?
- Both replacements follow a similar early hospital protocol but differ in sling time. A sling is worn for six weeks after anatomic replacement (to protect the rotator cuff repair) and two weeks after reverse replacement. Passive exercises start within the first day or two under physiotherapy guidance. Active movement progresses through the early weeks, with strengthening from around three months. Most patients can drive at four to six weeks once out of the sling and with safe two-handed control of the steering wheel. Pain relief is usually noticed quickly, often before strength has fully returned. Strength and range continue to improve over six to twelve months.
References
- Australian Orthopaedic Association National Joint Replacement Registry. Hip, Knee and Shoulder Arthroplasty: 2025 Annual Report — Shoulder Replacement. Adelaide: AOA; 2025. Tables ST1, ST6, ST78, ST79.
- Bacle G, et al. Long-term outcomes of reverse total shoulder arthroplasty: a follow-up of a previous study. J Bone Joint Surg Am. 2017;99(6):454-461.
Considering shoulder replacement?
Book a consultation with Dr Piper
Bring a referral and any imaging you have (x-rays, MRI, CT). Consultations at Lakeview Private Hospital, Norwest.