Am I a Candidate for Shoulder Replacement? Pain, Imaging, Health and the Rotator Cuff

A good shoulder replacement candidate has shoulder pain that limits sleep and daily life, changes on imaging that match that pain, general health fit for an anaesthetic, and realistic expectations about what the arm will do afterwards. The usual reasons to operate are glenohumeral osteoarthritis, rotator cuff tear arthropathy, rheumatoid arthritis, avascular necrosis (bone death of the humeral head) or a complex fracture, once painkillers, injections and physiotherapy no longer help¹.

When I first started reading about this, I wanted a checklist: a yes or no, something that told me whether I was allowed. What I slowly understood is that candidacy is not a gate you pass or fail; it is a picture a surgeon builds from your shoulder, your health and, honestly, what you are expecting the operation to do. This is the version of that picture I wish I had read before my consultation. For the full overview of the operation itself, start with the shoulder replacement pillar guide.

Do I need to be in enough pain?

The usual reason to operate is pain, not stiffness alone and not a poor scan on its own, and specifically pain that painkillers, injections and physiotherapy no longer control. Surgeons want to see that reasonable non-surgical measures have been genuinely tried and have stopped working before they replace a joint¹.

The pain that counts is the kind that reorganises your life. Mine had me sleeping upright in an armchair because lying flat was unbearable, and reaching up to close a car boot would send a grind down to my elbow that no tablet touched. That was the point where the sums changed: a shoulder replacement is major surgery, but roughly 90% to 95% of people have less pain and better function afterwards, and that trade only makes sense once the pain is bad enough to justify it². If that sleepless, chair-bound stage sounds familiar, I have written about it in the shoulder pain that stopped me sleeping.

What does the imaging need to show?

The changes on your scan have to match your pain: an X-ray or CT that shows a worn glenohumeral joint, a failing cuff, avascular necrosis or a fracture, in the shoulder that actually hurts. Imaging on its own does not make you a candidate, because plenty of people have wear on a scan and little pain, and the operation only earns its place when the picture and the symptoms line up¹.

This surprised me. I assumed the scan was the verdict, when in fact it is one half of a pair. A surgeon reads the imaging alongside examining the shoulder in front of them, checking how much movement is left, where the pain sits, and crucially the state of the rotator cuff. Getting the match right is a large part of why around 90% of patients report a good or excellent result: the operation is being aimed at a problem it can actually solve.

Does my rotator cuff decide it?

The state of the rotator cuff, not your age, mainly decides which of the three operations suits your shoulder: an intact cuff points toward an anatomic total replacement, while a torn, irreparable cuff with arthritis points toward a reverse. The reverse design exists precisely because an anatomic replacement fails early when the cuff can no longer power or stabilise the arm³.

This was the point that floored me at my own consultation. I had assumed my age would drive the decision; instead the surgeon pointed at a cuff long past repairing and explained that the ball and socket would be switched so my deltoid muscle could lift the arm instead. Reverse replacement has expanded its indications so far that it is now the most commonly performed type in several national registries. The case for that specific operation is set out in rotator cuff arthropathy and reverse replacement.

How fit and healthy do I need to be?

You need to be in reasonable general health, well enough for a general anaesthetic that is very often combined with a regional nerve block, with any conditions such as diabetes, heart or lung disease well controlled beforehand. Overall fitness does more of the deciding on candidacy than age, and an active infection anywhere in the body is a particular concern before implanting an artificial joint⁴.

The reason infection weighs so heavily is that it already affects roughly 1 in 100 primary shoulder replacements (about 1%, reported from 0 to 4%), and a reverse carries a somewhat higher rate; deep infection can mean further surgery, so surgeons will not add an avoidable source to that risk³. Being upfront about your full medical history, every medicine and supplement included, is part of being a genuine candidate rather than paperwork to rush through. Your surgeon and anaesthetist assess your fitness for surgery and anaesthesia together.

Am I too young, or too old?

Age alone rarely rules someone in or out: general health does the deciding on fitness, and the cuff decides the operation, but age does shape the longer-term maths. With around 90% of replacements still in place at 10 years and a roughly 1% per year revision risk after the first decade, a joint put in at a younger age is more likely to need redoing in a lifetime¹.

So a fit, healthy person in their late seventies can be a better candidate than someone younger whose health is unstable, while a younger patient in real trouble is weighed against the likelihood of a future revision rather than told simply to wait. It is a judgement, not a birthday. If timing is your main question, the trade-offs of operating earlier versus holding on are set out in shoulder replacement at what age.

What counts as realistic expectations?

Realistic expectations mean understanding that the operation relieves pain and gives back a useful, working arm rather than a twenty-year-old shoulder: overhead and rotational range improves but is rarely full, and the joint should not be loaded like an undamaged one. Around 90% of patients report a good or excellent result, but a good candidate is at peace with a working arm, not a perfect one².

Here is the part no checklist captures. Being a good candidate is partly in your head: knowing why you want it, being ready for the sling weeks and the months of rehab that actually make the result, and not asking the operation to fix something it was never built for. I found that honest reckoning as important as any medical box, and the plain boundaries of the surgery are set out in what shoulder replacement will not fix.

Who decides whether I am a candidate?

The final decision rests with a qualified surgeon examining you and your imaging in person, not with an online checklist, however much you want one to say yes. Whether surgery suits you, which of the three operations fits your shoulder, and what result is realistic are surgical judgements that weigh the state of your cuff, your general health and your goals together¹.

That is not a brush-off; it is the honest limit of what any article can do, including this one. What you can do beforehand is arrive prepared: be clear about the pain and what it stops you doing, get your general health in order, be upfront about your history, and bring the questions that matter to you rather than the ones a website guessed at. Mine was the arm I actually got back, months later, reaching a high shelf without thinking about it first.