The shoulder was already running on a margin. The impact spent it.

SHOULDER INJURY AFTER A COLLISION OR A FALL

After an accident such as a crash or a fall, an injured shoulder is usually one whose reserve the impact spent. It is not one whose anatomy suddenly changed. In a general population cohort of older women, about half of full-thickness rotator cuff tears caused no symptoms. So the tear on your scan has to be shown to be the pain generator before it is treated.

Almost nobody is relaxed at the moment of impact. The arm goes out and the hand locks onto something. Then the shoulder takes a load through a straight arm, and it is not built to take that. A fall onto the point of the shoulder does something different again. Both end in the same talk about whether the tear was already there — and that talk asks the wrong question.

Start with the number the whole thing turns on

The Chingford cohort scanned 1,003 women aged 64 to 87 — and 22.2% had full-thickness rotator cuff tears. These women were scanned as a general population sample, not as a clinic sample. And 48.4% of those full-thickness tears were asymptomatic (caused no symptoms).

Half of them hurt nobody. So a tear on a scan does not show that the tear is what hurts, in you, now. What changed on the day was not necessarily the anatomy. It was the shoulder's capacity to tolerate the anatomy it already had.

Margin is the right word, and margin is biological

A shoulder that made up for a problem silently for years was running on a reserve. That reserve was cuff strength, control of the shoulder blade, and a neck (cervical spine) quietly doing its part. It was also a tendon repairing small damage at about the rate the damage piled up. The event spent the reserve. Getting function back means rebuilding it. And part of what decides whether it can be rebuilt has nothing to do with the shoulder.

A systematic review and meta-analysis of risk factors for rotator cuff tendinopathy (tendon disease) found systemic (whole-body) and metabolic associations, not only links to mechanical load. That is the unglamorous half of shoulder care. It is also the half that decides who does well. Picture a cuff asked to repair itself in a body with untreated insulin resistance, poor sleep and ongoing nicotine exposure. It is working against its own supply chain. No injection outruns that. Why a pain clinic asks to see your bloodwork covers what we measure and why we measure it before, not after.

Then work out which structure is actually generating the pain

About half of what arrives as shoulder pain is not coming from the shoulder. That is the subject of the shoulder-or-neck page. Pain referred from the neck (cervical spine) copies a shoulder pattern so well that treating the largest finding on the report is a coin flip. Examination first, target second, catalyst last.

What we decide before anything is offered

The question is whether the cuff is the pain generator at all. If it is, the odds favor a tear we treat. Partial-thickness tears are about twice as common as full-thickness ones; a 2024 review of the treatment evidence opens from exactly that point: “Studies have shown partial-thickness rotator cuff tear (PTRCT) prevalence to be twice that of full-thickness tears” (Eubank et al., 2024). Conservative care matches surgery for those tears. So a stalled repair in a tendon that is still continuous (not torn through) is treated here with guided injection, PRP into the tendon, loading of the cuff and shoulder blade, and work on the terrain, and we work to keep that shoulder out of the operating room. A tendon torn all the way through and pulled back is the exception, and it goes to a surgeon. Which modality suits a confirmed cuff target, and who it suits, is covered on the rotator cuff page.

We treat the pain generator, not the largest finding on a report just because it is the largest finding on a report. Half of these tears are silent. The one on your scan has to earn the blame before it earns a needle.

If a needle goes into a shoulder here, it goes in under ultrasound

A systematic review and meta-analysis looked at shoulder girdle injections. Ultrasound-guided shots were both more accurate and more effective than landmark-guided ones (placed by feel). The shoulder girdle is a cluster of small targets sitting close together. A catalyst placed by feel into the wrong one is not a treatment that failed. It is a treatment that never happened. The record should say which structure was entered and how placement was confirmed. Ours does.

The order we work in

Terrain measured and, where it can be, corrected. Shoulder blade mechanics and loading of the back of the cuff. A real answer on whether the neck is adding to the pain. Then a decision about the target. Only then a guided injection with a characterized (measured and described) preparation. The order is the treatment. The injection is one step inside it.

In the first weeks, gentle motion such as the pendulum exercise keeps a hurt shoulder from stiffening.

Questions after a shoulder injury

They say my rotator cuff tear is degenerative and pre-existing. Is that right?

It may be right about the anatomy and still be the wrong conclusion. That is because 48.4% of full-thickness tears in a general population cohort were asymptomatic (caused no symptoms). A tear that existed painlessly is not the same as a shoulder that was fine. The difference is capacity, not anatomy — which is what the rotator cuff page works through.

Will an injection fix my torn rotator cuff?

For most torn cuffs, it is part of the treatment we use. Most tears are partial and the tendon is still continuous, and for those, conservative care matches surgery. A 2026 systematic review of 16 studies and 893 patients found that “Conservative treatment, primarily physiotherapy-based, demonstrated comparable outcomes to surgery in partial-thickness tears or low-demand individuals” (Trygonis et al., 2026). That is where a guided biologic, with loading, does its work. A tear that has lost continuity (torn all the way through) is a structural problem that no injection restores, so the first question is which situation you are in. What a biologic is aimed at, and who it suits, is on the rotator cuff page.

My shoulder hurts but the imaging is of my neck. Which is it?

Often both. The share coming from each is worth finding out before anyone treats either. That is because pain referred from the neck can copy a shoulder pattern very well. That is why this is its own page.

Does it matter whether the injection is done with ultrasound?

At the shoulder girdle it matters measurably. In the pooled data, guided shots hit the target more often and work better than landmark-guided ones. Why placement and preparation are both recorded here is on the what-to-expect page.

Why are we discussing my A1C when I injured my shoulder in a crash?

Because the risk-factor evidence for cuff tendinopathy is systemic (whole-body) as well as mechanical. Send a repair signal into a body that cannot carry it out, and it is spent for nothing. What gets measured, and why it comes first, is on the metabolic health page.

On the shoulder, and around it

• PRP and the rotator cuff
• Shoulder or neck?
• Terrain first, then the catalyst
• When the scan is normal and the injury is not
• Why we ask for bloodwork
• What an appointment involves