Why Shoulder Ultrasound Scans Don’t Tell The Full Story

https://nwpg.com.au/why-shoulder-ultrasound-scans-dont-tell-the-full-story/

Recovering from a shoulder injury can be a long and complicated process. Shoulder pain can cause a major disruption to normal activities due to pain and restricted movement. Medical imaging is increasingly an important part of the overall treatment. By the time we treat someone for shoulder pain, they may have already been to see their GP and had a course of rest, anti-inflammatories, and ultrasound scans.

The scan will often show ‘wear and tear’ degenerative changes and other pathologies such as tendonitis, bursitis, or muscle tears. It is understandable that this ‘damage’ is thought to be the cause of their pain. They are often told that they have arthritis that is causing the pain, even though that is very rare in a non-weight bearing joint such as the shoulder, (it is much more common in the low back, hips, and knee joints).

https://nwpg.com.au/why-shoulder-ultrasound-scans-dont-tell-the-full-story/

MRIs, CT, and ultrasound scans have improved healthcare enormously, these imaging techniques are an important tool, but don’t give us the whole story. The tendency is to blame any pain on the structural abnormality seen in the scan. Both patients and clinicians make this mistake. (7)

  • Studies have shown in a pain-free shoulder group with ages ranging from 40 -70 years, abnormalities were found in 96% of shoulders scanned. (1)

  • Over 20% of the over 50-year-old group studied had muscle tears (with the frequency increasing with age). None had shoulder pain. This was seen as a normal consequence of ageing. (2)

  • 50% of young elite baseball pitchers had damage to the muscles or cartilage in the shoulder joint with no effect on their performance (3)

Similar results have been found with MRIs for low back and neck and scans for knees. (5,4) Abnormal findings in the sample group of pain-free subjects. If pain were present there is a significant risk of those ‘pathologies’ being blamed for the presenting pain or injury. Just by taking the scan results as confirmation that the cause of pain and disability are the abnormalities seen in the investigation.

There can be a wide difference in report results by different reviewers for the same scan, particularly with MRIs for back pain. There is poor agreement between reports, (6) suggesting that opinions regarding pathological change can vary significantly. Ultrasound for shoulders shows a fair to good correlation between sonographers. (8)

Other studies have highlighted the importance of noting pathological changes compared to the prevalence in a matched population, so they sound less sinister (9) or noting changes in a less negative way (10). In our experience, negative reports can impact attitudes to injury and take a lot of effort to explain that they may not be relevant.

Scans are often ordered to identify the cause of shoulder pain, but it’s very confusing when scans come back clear with no structural abnormality reported. There are a multitude of causes that we see in the clinic that will not show on a scan, such as poor motor control, muscle weakness, overactivity or inhibition, nerve tension or compression, a referral from the neck, thoracic spine, or remote drivers to mention a few.

Our treatment experience and the research suggest that changes seen on a scan can have a very little connection with the pain people are experiencing and that the results of the scan itself are not significant unless there also is a comprehensive assessment, and a clinical reasoning process is used to find the main cause of the shoulder pain.

Ideally, if no ‘’red’’ or caution flags are raised on assessment (if so, immediate referral back to a GP or further investigation is warranted) a treatment plan can be formulated. In the early acute phase, a period of unloading or rest is appropriate. This then progresses to finding and treating the cause of the shoulder pain and dysfunction. A graduated exercise program is essential here to improve tolerance to ‘loading’ of the injured tissue. There is then a gradual increase in exercise resistance, repetitions, speed, and complexity and a return to full activity. We recommend that further investigation or scans be organised in conjunction with the treating doctor if there is slower than expected recovery.

In summary ultrasound for shoulder pain can be a valuable adjunct to treatment when referred appropriately. The findings of structural damage must be seen in the context of the clinical presentation rather than as a definite causal factor.

At Northwest Physiotherapy Group, we look at the whole person. You are not just the sum of the negative changes seen on scans. If you have pain or issues with your shoulder the experienced physios at NWPG look at all the possible causes rather than just the ultrasound results.

References

  1. Ultrasound of the shoulder: asymptomatic findings in men Gandikota Girish et al

         AJR Am J Roentgenol  2011 Oct;197(4):W713-9

 

  1. A systematic review and pooled analysis of the prevalence of rotator cuff disease with increasing age.

         Teunis T, Lubberts B, Reilly BT, Ring D. J Shoulder Elbow Surg. 2014

 

  1. Glenohumeral findings on magnetic resonance imaging correlate with innings pitched in asymptomatic pitchers Bryson P Lesniak 1 Michael G BaragaJean JoseMarvin K SmithSean CunninghamLee D Kaplan Am J Sports Med . 2013 Sep;41(9):2022-7.

 

  1. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations W Brinjikjiet al AJNR Am J Neuroradiol . 2015 Apr;36(4):811-6.

 

  1. Abnormal findings on magnetic resonance images of the cervical spines in 1211 asymptomatic subjects. Hiroaki Nakashima Spine (Phila Pa 1976)

 

  1. Variability in diagnostic error rates of 10 MRI centers performing lumbar spine MRI examinations on the same patient within a 3-week period. Richard Herzog et al. Spine J . 2017 Apr;17(4):554-561

 

  1. https://www.thesports.physio/a-picture-is-not-always-worth-a-thousand-words/

 

  1. Intra- and Inter-Rater Reliability of Ultrasound Measurements of Supraspinatus Tendon Thickness, Acromiohumeral Distance, and Occupation Ratio in Patients With Shoulder Impingement Syndrome. Fatih BaĞcier   Arch Rheumatol . 2020 Feb 7;35(3):385-393.

 

  1. Lumbar MR imaging and reporting epidemiology: do epidemiologic data in reports affect clinical management? Brendan J McCullough 1 Germaine R JohnsonBrook I MartinJeffrey G Jarvik Radiology . 2012 Mar;262(3):941-6.

  2. Does Rewording MRI Reports Improve Patient Understanding

         and Emotional  Response to a Clinical Report?
         Jeroen K. et al Clin Orthop Relat Res     (2013) 471:3637–3644    

 

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