Upper limb pain syndromes.
Which anatomical structures account for shoulder pain?
The shoulder complex comprises the glenohumeral, acromiaclavicular, sternoclavicular, scapulothoracic joints and the subacromial space. Important softtissue structures include the capsule, subacromial bursa and rotator cuff muscles - supraspinatus, infraspinatus, teres minor and subscapularis.
What are the causes of referred pain to the shoulder?
Cervical spine pathology is a common cause of referred pain to the shoulder. Symptoms are exacerbated by neck movements and may be accompanied by radicular pain and/or paraesthesia down the arm. Less commonly, but importantly, referred pain may arise from cardiac disease and sub-diaphragmatic pathology (1), (2).
How dose one distinguish articular and soft-tissue pathologh of the shoulder?
It is important to consider the pattern of limitation of motion. A capsular pattern that implies articular pathologypresents as restriction of passive movement, where external rotation is affected more than abduction and internal rotation is the least affected (3).
Pain or weakness with active movement of the muscles against resistance suggests degeneration or a tear of a contractile structure:
* resisted abduction [right arrow] supraspinatus tendon
* resisted external rotation [right arrow] infraspinatus tendon
* resisted internal rotation [right arrow] subscapularis tendon.
What is shoulder impingement syndrome?
Rotator cuff muscles traverse a narrow space between the acromion and coracoacromial, ligament above and the humeral head below. Tendinitis, bursitis or acromioclavicular joint disease compromises the space and impinges the cuff. This is maximal during abduction. It typically produces the painful arc between 70[degrees] and 120[degrees] of shoulder abduction. Internal rotation of the abducted shoulder also reproduces the symptoms. Treatment includes non-steroidal anti-inflammatory drugs (NSAIDs), physiotherapy and steroid infiltration into the subacromial space. If patients fail a second steroid infiltration, surgery may need to be considered (4).
What is a frozen shoulder?
Marked limitation of shoulder movement as a result of contraction or fibrosis of the capsule of the glenohumeral joint may follow chronic inflammatory arthritis, previous trauma, or prolonged immobilisation or may be idiopathic. The condition is seen more commonly in diabetics and in patients after myocardial infarction or stroke. Patients typically have a history of chronic shoulder pain with inability to lie on the affected side, followed by progressive stiffening of the shoulder in all ranges of motion, especially external rotation. Most cases resolve over a few months after mobilisation exercises and a corticosteroid infiltration. Recovery may be prolonged, taking up to 2 years, especially in diabetics (5).
How often is the shoulder joint involved in systemic or generalised arthritic disorders?
The most common inflammatory arthropathy involving the shoulder joint, including the rotator cuff, is rheumatoid arthritis. Shoulder involvement is also seen in seronegative spondyloarthritis (SpA), affecting about 30% of patients with ankylosing spondylitis. Gouty involvement of the shoulder is uncommon. Glenohumeral osteoarthritis is rare and should prompt a search for secondary causes, such as chronic rotator cuff tear, acromegaly, previous trauma or underlying inflammatory arthritis. (5)
What is the Milwaukee shoulder?
This is a condition seen in elderly women due to calcium hydroxyapatite deposition, resulting in an haemorrhagic effusion, severe rotator cuff degeneration and rapidly progressive destructive arthritis of the shoulder joint.(5)
What is enthesitis?
This is inflammation at sites of tendon, ligament, capsular or fascial insertion into bone. It may occur after injury, in repetitive use syndromes and in certain inflammatory conditions such as SpA and HIV-associated arthropathies.(6)
What are the common causes of medial and lateral elbow pain?
Enthesopathy at the origin of the common wrist flexor is characterised by pain at the medial aspect (golfer's elbow) with tenderness just distal to the medial epicondyle and pain that worsens with wrist flexion. Enthesopathy at the origin of the wrist and finger extensors presents with pain and tenderness over the lateral epicondyle exacerbated by resisted wrist extension (tennis elbow). Management may include steroid infiltration if the patient does not respond to conservative measures. (7)
Which conditions need to be considered in patients with nonspecific distal arm pain in the absence of obvious pathology?
Repetitive strain injury is usually a diagnosis of exclusion, with occupational overuse being an important risk factor. Some consider this condition to be a variant of fibromyalgia, as patients tend to have associated fatigue and sleep disturbances. Conditions such as carpal tunnel syndrome (CTS) and a small ganglion within the wrist need to be excluded. (8)
What are the signs of carpal tunnel syndrome?
Typically, patients present with sensory loss or paraesthesia along the radial aspect of the ring, middle and index fingers and the thumb. Symptoms may be reproduced by tapping over the carpal tunnel (Tinel's sign) or by full flexion of the wrist for 60 seconds (Phalen's sign). Thenar atrophy may be present, implying chronicity. Predisposing conditions are inflammatory arthropathy, acromegaly, diabetes, hypothyroidism, overuse syndromes and pregnancy.(7), (8)
What is De Quervain's disease?
This is tenosynovitis of the first dorsal compartment of the wrist, which presents with pain on the radial side of the wrist and the base of the thumb. Pinching or grasping movements of the thumb produce pain. A clinical test - Finkelstein's manoeuvre - is positive if pain is reproduced along the first dorsal compartment, when the wrist is moved in an ulnar direction with the thumb clasped in the palm. Local steroid infiltration into the tendon sheath may be required if conservative measures with NSAIDs and wrist/thumb splint fail.(7), (8)
What is trigger finger?
This is tenosynovitis affecting the flexor tendons of the fingers or thumb, resulting in fibrosis or nodule formation. It interferes with the normal smooth movement of the tendon, 'catching' or locking as the tendon passes under the A1 pulley in the region of the metacarpophalangeal joint. Patients may have tenderness at the base of the finger with a palpable nodule. Pain is exacerbated by stretching the tendon in extension or resisted flexion.
Patients may benefit from local steroid infiltration. Conservative measures include immobilisation for 4 - 6 weeks, with a repeat steroid infiltration; if symptoms persist for more than 6 weeks surgery should be considered.(7), (8)
* Upper limb pain syndromes may be due to a wide variety of local or systemic factors, many of which may be effectively managed in primary care.
* Due consideration has to be given to referred pain so as not to miss pathology elsewhere.
References available at www.cmej.org.za
MAHMOOD MOOSA TAR MAHOMED ALLY, MB BCh, FCP (SA)
Professor and Head, Division of Rheumatology, Department of Internal Medicine, School of Medicine, University of Pretoria
Correspondence to: M Ally (email@example.com)
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|Title Annotation:||MORE ABOUT...RHEUMATOLOGY|
|Author:||Ally, Mahmood Moosa Tar Mahomed|
|Publication:||CME: Your SA Journal of CPD|
|Date:||Aug 1, 2011|
|Previous Article:||The eye in rheumatoid arthritis.|