The shoulder is the joint people put up with the longest
Most people who come to us about a shoulder have been managing it for months. It started as a twinge when reaching overhead, became a problem sleeping on that side, and eventually became the reason they stopped doing something they liked — swimming, lifting, gardening, throwing a ball with a kid.
Shoulder pain is worth taking seriously early, and it is also one of the areas where the research on light-based treatment is at its most useful. Of everything we offer at Venturis, tendon and joint problems are where the randomized evidence is strongest, and the shoulder sits right in the middle of that.
This piece explains what actually helps, what the trials found, and how we decide whether it is a reasonable option for a particular shoulder.
What is usually going on
Shoulder pain has a handful of common sources, and they behave differently:
Rotator cuff tendinopathy. The most common. The tendons of the rotator cuff — the four muscles that hold the ball of the shoulder into its socket and steer it through range — become painful and irritable, usually from load they were not conditioned for or from a sudden change in activity. Overhead reaching and lying on that side are the classic aggravators.
Subacromial pain. Pain in the space between the top of the arm bone and the bony roof above it. Often overlaps with cuff tendinopathy and is treated similarly.
Frozen shoulder (adhesive capsulitis). A different problem, with stiffness as the dominant feature rather than pain on specific movements. It follows its own long timeline and needs a different plan.
Rotator cuff tears, arthritis of the shoulder, referred pain from the neck. Each needs identifying, because each changes what should happen next. Pain that comes from the neck will not respond to treatment aimed at the shoulder, and we see that mistake fairly often.
That list is the reason a shoulder gets examined before it gets treated. The word “shoulder pain” describes a location, not a diagnosis.
What the randomized trials found
The most useful single source on light therapy for shoulder tendon pain is a 2015 systematic review and meta-analysis published in Physiotherapy Research International.
It pooled seventeen randomized controlled trials. Thirteen were rated high methodological quality and four moderate. The primary outcome was pain on a 100-millimetre visual analogue scale — the standard “mark your pain on this line” measure.
Two findings matter:
- Used on its own, low-level laser therapy produced a weighted mean difference of 20.41mm over placebo (95% CI 12.38 to 28.44).
- Used alongside exercise therapy, it produced a weighted mean difference of 16.00mm over placebo (95% CI 11.88 to 20.12).
For scale: on a 100mm scale, a change of roughly 15–20mm is generally the point at which patients themselves report the difference as meaningful rather than merely detectable. Both figures clear that bar, with confidence intervals that stay above zero.
The review also reported that global improvement — the patient’s own judgment of whether things were better — favoured the treated groups. And it reported something we think is the practical centre of this whole literature: the benefit tracked with dose. The trials that delivered adequate doses were the trials that showed the effect. We come back to that below.
Haslerud S, et al. The efficacy of low-level laser therapy for shoulder tendinopathy: a systematic review and meta-analysis of randomized controlled trials. Physiother Res Int. 2015;20(2):108–125. PMID 25450903
The sentence we want you to leave with
This is an adjunct with modest, real effects — it works alongside exercise and rehabilitation rather than replacing them.
The pain relief in those trials is genuine and it is measurable. What it does not do is rebuild the capacity of a tendon. That is the job of graded loading — progressively harder, well-chosen exercise over weeks — and there is no shortcut around it that we are aware of.
What light therapy is good for, in our reading of the evidence, is making that work possible. A shoulder that hurts less through range is a shoulder that will actually do its exercises, sleep better, and get through a rehabilitation programme rather than abandoning it in week two. That is a supporting role, and it is a valuable one.
We frame it as adjunctive because that is what the evidence supports. To be explicit about the regulatory position: we are not citing a device clearance for treating rotator cuff tendinopathy, and we do not present light therapy as an approved treatment for that diagnosis. We use it as an adjunct for pain, inside a plan whose main component is rehabilitation.
Why dose is the whole argument
That dose-dependency in the shoulder trials is echoed elsewhere in this literature. In knee osteoarthritis, a 2019 meta-analysis in BMJ Open pooling 22 trials and 1,063 patients found that doses following international dosing recommendations produced 18.71mm of pain reduction, peaking at 31.87mm two to four weeks after the treatment course ended, while doses outside those recommendations produced 6.34mm (subgroup difference p=0.02).
Same modality. The difference was how it was delivered.
That is a knee finding, not a shoulder one, and we are not transplanting the numbers. We raise it because the pattern is consistent across body regions: wavelength, power, energy delivered per point, number of points and where exactly the beam is aimed all determine whether anything happens at all. It is why “do you have a laser?” is a much less useful question to ask a clinic than “what parameters do you use, and why those?”
Stausholm MB, et al. Efficacy of low-level laser therapy on pain and disability in knee osteoarthritis: systematic review and meta-analysis of randomised placebo-controlled trials. BMJ Open. 2019;9(10):e031142. PMID 31662383
We have written separately about how dose changes the result in knee osteoarthritis and about why the target site matters so much in tennis elbow.
Who this tends to suit
In our clinic, the people who do best with light therapy added to their shoulder plan tend to share a few features:
- The pain is coming from tendon or subacromial structures, confirmed on examination rather than assumed.
- They are able and willing to do the loading programme — the treatment is there to make that easier, not to substitute for it.
- The problem is measured at the start, so there is something to compare against later. We score pain and function at every visit for exactly this reason.
- Expectations are calibrated to a course of treatment over several weeks, not a single session.
And the people for whom it is not the right first move:
- Anyone whose examination points at the neck rather than the shoulder.
- Anyone with red flags — significant trauma, sudden loss of strength, unexplained weight loss, fever, a history that suggests something other than a tendon problem. Those need investigation first.
- Anyone whose shoulder is stiff rather than painful in a specific arc, where a frozen shoulder pathway is more appropriate.
- Anyone hoping to avoid the exercise. We would rather say so at the consultation than three weeks in.
How we approach it at Venturis
We examine the shoulder before we treat it — range of motion, strength through specific patterns, what provokes and what relieves, and what has already been tried. We agree on measures at the outset. We set the treatment parameters deliberately and record them, so a course can be reviewed and adjusted rather than repeated on autopilot. And we build the plan around the loading work, with the light therapy positioned to support it.
If we do not think it is likely to help your particular shoulder, we will say that. Declining to treat is part of practising honestly.
If your shoulder has been bothering you for more than a few weeks, or it is affecting your sleep, that is a reasonable point to have it looked at properly. You are welcome to book a consultation with us in Oklahoma City, or to take this article to your own physician or physiotherapist and ask what they think.
You may also find our overview of what photobiomodulation actually is useful background.
This article is general education, not medical advice, and it is not a substitute for evaluation by a qualified clinician. It does not establish a physician–patient relationship. Individual results vary, and the studies described report group averages rather than what any one person should expect. Treatments discussed may not be FDA-cleared or approved for the conditions mentioned; where that is the case it is stated in the text. Talk to your own physician before starting, stopping or changing any treatment.
