Shoulder pain: diagnosis and management in primary care
Compromised shoulder movement due to pain, stiffness, or weakness can cause substantial disability and affect a person's ability to carry out daily activities (eating, dressing, personal hygiene) and work.w1 Self reported prevalence of shoulder pain is estimated to be between 16% and 26%; it is the third most common cause of musculoskeletal consultation in primary care, and approximately 1% of adults consult a general practitioner with new shoulder pain annually.1 Occupations as diverse as construction work and hairdressing are associated with a higher risk of shoulder disorders. Physical factors such as lifting heavy loads, repetitive movements in awkward positions, and vibrations influence the level of symptoms and disability, and psychosocial factors are also important.w1 Recent studies suggest that chronicity and recurrence are common.2,3
Common shoulder disorders exhibit similar clinical features, and the lack of consensus on diagnostic criteria and concordance in clinical assessment complicates treatment choices.3 w2-w5 This review proposes an evidence based approach using a simplified classification of shoulder problems, incorporating diagnostic techniques applicable to a primary care consultation and a “red flag” system to identify potentially serious disease.
Sources and selection criteria
We incorporated the latest consensus from systematic reviews and publications identified by a literature search through Medline, CINAHL, AMED, the Cochrane Library (Central, CDSR, HTA, DARE), Clinical Evidence, Best Evidence, Embase, British Nursing Index, PEDro,w6 Web of Science (social science and science citation indexes), and bmj.com. The search strategy included the terms “shoulder pain”, “rotator cuff disorder”, “rotator cuff tear”, “frozen shoulder”, and “primary care”.
We found six published systematic reviews of interventions for shoulder disorders and one health technology assessment systematic review of diagnostic tests for the assessment of shoulder pain.4-10 A topic search within Clinical Evidence identified the section “Shoulder pain.”11 We identified and critically appraised other key publications in peer reviewed journals that were relevant to primary care or published since the latest systematic reviews.w7
Assessment of the painful shoulder
Diagnosis should be pragmatic and based on a clinical assessment (box 1) that groups patients according to the most common presentations in primary care (figure). An overcomplicated approach to diagnosis is unlikely to alter early conservative management in primary care.12
Diagnosis of shoulder problems. Adapted with permission from shoulder pain algorithm: www.oxfordshoulderandelbowclinic.org.uk
The four most common causes of shoulder pain and disability in primary care are rotator cuff disorders, glenohumeral disorders, acromioclavicular joint disease, and referred neck pain (box 2).
One primary care study that used standardised clinical tests for shoulder disorders found rotator cuff tendinopathy in 85% of patients, but in 77% of patients a clinical diagnosis of more than one shoulder problem was made—for example, tendinosis and impingement (57%); tendinosis, impingement, acromioclavicular disease, and adhesive capsulitis (6%).13 Blood tests and radiography are indicated only if there are “red flag” indicators such as symptoms and signs of systemic disease (weight loss, generalised joint pains, fever, lymphadenopathy, new respiratory symptoms); history of cancer; or concerning local features such as a mass lesion or bony tenderness or swelling (box 3).
Rotator cuff disorders (age 35-75)
Rotator cuff tendinopathy is the most common cause of shoulder pain. An occupational history may reveal heavy lifting or repetitive movements, especially above shoulder level.w1 Although related to activity, it often occurs in the non-dominant arm and in non-manual workers. Evidence suggests genetic susceptibility in some families.w8 Wasting may be present on examination; active and resisted movements are painful and may be partially restricted, whereas passive movements are full, albeit painful. Although a painful arc is neither specific nor sensitive as a clinical sign, its presence reinforces the diagnosis of a rotator cuff disorder.14
A rotator cuff tear is usually strongly indicated by the history: traumatic in young people and atraumatic in elderly people (related to attrition from bony spurs on the undersurface of the acromion or intrinsic degeneration of the cuff). Partial tears may be difficult to differentiate from rotator cuff tendinopathy on examination; weakness in resisted movement may occur in either condition. Several studies have suggested that no correlation exists between symptoms and loss of function in the presence of full thickness supraspinatus tears, that tears of the lower rotator cuff may lead to inability to rotate beyond 20°, and that partial and full thickness tears are commonly found during imaging of asymptomatic people.15-17 The “drop arm test” may be used to detect a large or complete tear (a high specificity and low sensitivity for this test was reported in a secondary care population).14
Glenohumeral disorders (adhesive capsulitis: age 40-65, median 50-55; osteoarthritis: ≥60)
Adhesive capsulitis (“frozen shoulder”) and true glenohumeral arthritis are often preceded by a history of non-adhesive capsulitis symptoms, are characterised by deep joint pain, and restrict activities such as putting on a jacket (impaired external rotation). Adhesive capsulitis is more common in people with diabetes and may also occur after prolonged immobilisation. On examination global pain is present, along with restriction of all movements, both active and passive.
Acromioclavicular disease (teenage to 50)
Acromioclavicular disease is usually secondary to trauma or osteoarthritis; dramatic joint dislocation can occur after injury (teenage to 30 years). Pain, tenderness, and occasionally swelling are localised to this joint, and there is restriction of passive, horizontal adduction (flexion) of the shoulder, with the elbow extended, across the body. Acromioclavicular osteoarthritis may also cause subacromial impingement.
Referred mechanical neck pain (common)
Typically there is pain and tenderness of the lower neck and suprascapular area, referred to the shoulder and upper limb area; shoulder movement may be restricted. Movement of the cervical spine and shoulder may reproduce more generalised upper back, neck, and shoulder pain. Upper limb paraesthesia may occur.18Treatment is with relative rest and analgesia, and return to normal activities should be encouraged. Physiotherapy may be helpful.
Treatment
A functional holistic approach to shoulder pain, including adequate analgesia, is important to motivate patients and encourage rehabilitation. However, the evidence for common primary care interventions, including steroid injections, is relatively weak.6 The general practitioner should decide whether the pain is arising from the shoulder; if it is from elsewhere, the patient should be treated and referred appropriately.
If the pain is arising from the shoulder, is it due to a rotator cuff disorder or a glenohumeral joint problem? For both these shoulder disorders, analgesics should be recommended (ideally paracetamol; non-steroidal anti-inflammatory drugs should be used intermittently as second line if no contraindications exist), activity should be encouraged, and written information provided (for example, the Arthritis Research Campaign's patient leaflet).
Rotator cuff disorders (including possible minor tears)
Rotator cuff disorders should be treated initially with relative rest of the shoulder. The patient should return to normal activity or temporarily modified work as soon as possible,w1 within the limits of the disability and pain. Overall, systematic reviews and more recent studies suggest equivalent short term benefit for physiotherapy (incorporating supervised exercise) and steroid injections in the management of shoulder disorders.6,7,10 In a primary care population with undifferentiated shoulder disorders, participants allocated to a physiotherapy treatment group were less likely to re-consult with a general practitioner than were those receiving steroid injections alone.12
A single recent study reported that a subacromial injection of xylocaine was as effective as steroid plus xylocaine in all disease specific outcome measures at two weeks, with follow-up of participants at six, 12, and 24 weeks.w9 Some practitioners recommend larger volumes of injection of up to 10 ml, as a theoretical benefit of hydrodilatation of the subacromial bursa exists. However, inadequate evidence is available on evaluating outcomes with variation in volume injected.19 Therefore, subacromial corticosteroid injections, up to 10 ml in volume, should be considered for short term pain relief and to facilitate rehabilitation. If the initial response is good, the injections should be repeated up to three times, at six weekly intervals. No evidence exists to show that steroid injections are either harmful or beneficial in the presence of a rotator cuff tear, so they should be avoided if the drop arm test is positive.5 w10
Glenohumeral disorders
Traditional teaching is that the natural history of a frozen shoulder is recovery by two years; however, symptoms may persist for three years or more in some cases, particularly in patients with diabetes mellitus. Corticosteroid injections (intra-articular, anterior approach) may be of benefit in reducing pain in the early phase.10 No evidence exists to show that physiotherapy alone is of benefit for adhesive capsulitis; when the joint is very painful, movement is distressing and may well be counterproductive.7 Intra-articular corticosteroid injections and physiotherapy, starting one week after the injection, may be of short term benefit.20 However, in this study, intra-articular injection was done as a guided technique using fluoroscopy, limiting the generalisability of these findings to primary care.
Acromioclavicular disorders
Acromioclavicular disorders usually resolve with rest and simple analgesia, unless significant traumatic dislocation is present. If symptoms persist, a local steroid injection may help.
Biopsychosocial and complementary interventions
Individual psychosocial factors such as a passive coping style, fear of movement, and general psychological distress influence the risk of chronicity of symptoms in low back and neck pain. Therefore, targeted interventions to alter these and any occupational factors have also been suggested for shoulder disorders.w1A systematic review, however, concluded from the little evidence available that no evidence showed that multidisciplinary biopsychosocial rehabilitation is better than “usual care” in the management of shoulder problems in adults of working age.9
The only complementary therapy widely reported on is acupuncture. The studies identified by systematic review were small and methodologically diverse and provided little evidence to either support or refute the use of acupuncture for shoulder disorders.5,8 The authors concluded that acupuncture may improve pain and function in the short term (two to four weeks).8
Further investigation
Ultrasound examination and magnetic resonance imaging have been reported as useful diagnostic tools in secondary care and may increase the specificity of diagnosis.3,21,22 w2 However, early access to these investigations is unlikely to improve management of a heterogeneous group of shoulder disorders that should usually be managed conservatively and for which surgical intervention (informed by sophisticated imaging techniques) is rarely indicated. Structural abnormalities may be present in asymptomatic patients,15 and thus early investigation may paradoxically increase referral rates to specialists.w11
Referral criteria
The patient should be referred to an orthopaedic specialist if there is
- Pain and significant disability lasting more than six months, despite attention to occupation or sporting factors and, if indicated, physiotherapy and steroid injections
- History of instability (“Has your shoulder ever partly or completely come out of joint?” “Are you worried that your shoulder might slip on certain movements?”) or acute, severe post-traumatic acromioclavicular pain
- Diagnostic uncertainty or red flag criteria summarised in box 3.
Future developments and surgical interventions
Surgery has a place in the management of emergencies such as unreduced dislocation, infection, and traumatic acute rotator cuff tear. Its role is less clear in frozen shoulder, for which some surgeons advocate manipulation under anaesthesia and arthroscopic release.23 A recent study found equivalent results for graduated supervised physiotherapy programmes and arthroscopic decompression for patients with rotator cuff disease.24 For significant persistent disability associated with impingement and rotator cuff tear, surgery may be effective at relieving pain and restoring function in patients who have failed conservative treatment. However, published studies typically involve small numbers of participants with limited long term follow-up.5 Controversy exists regarding the management of mildly symptomatic small rotator cuff tears. Arguably, small tears should be repaired to relieve symptoms and to prevent progression to larger tears, which are associated with high levels of disability, but little evidence exists to support this view. For resistant acromioclavicular joint pain, an arthroscopic excision of the distal clavicle is an effective low risk procedure. Surgery remains the mainstay of management for most cases of recurrent shoulder instability; those cases that do not need surgery will need specialist physiotherapy and can be difficult and resistant problems. The management of osteoarthritis and rheumatoid arthritis has improved considerably in recent years, and joint replacement surgery, as with other joints, provides relief of pain for end stage disease.
Conclusions
Shoulder pain is a common and important musculoskeletal problem. Management should be multidisciplinary and include self help advice, analgesics, relative rest, and access to physiotherapy. Steroid injections have a marginal short term effect on pain.
Poorer prognosis is associated with increasing age, female sex, severe or recurrent symptoms at presentation, and associated neck pain. Mild trauma or overuse before onset of pain, early presentation, and acute onset have a more favourable prognosis.3,25 w12 No evidence exists to show that early orthopaedic intervention improves the prognosis for most rotator cuff or glenohumeral disorders. Surgery should be considered when conservative measures fail.
Notes
Extra references w1-12 are on bmj.com
Contributors: CM, AA, and EH conceived the idea for the article. CM reviewed the literature. All authors contributed to writing the article. CM is the guarantor.
Competing interests: None declared.
References
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