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shoulderpain

the painful shoulder

introduction

  • shoulder pain is a very common presentation to the ED
  • one needs to differentiate local injury or inflammation to that from referred pain

referred pain

  • a painful stimulus involving the diaphragm or the mediastinum commonly results in referred shoulder tip pain, usually on the same side this may be due to life threatening ruptured ectopic pregnancy with haemoperitoneum - urgent bedside FAST USS if this is a possibility
  • referred pain may also originate in the cervical nerves such as with cervical disc prolapse
  • the patient with referred pain to the shoulder generally has full range of movement of the shoulder without increase in pain

common causes

  • gastro-oesophageal reflux
  • diaphragmatic pleural inflammation - eg pulmonary embolism (PE), pneumonia
  • free fluid in the abdomen - eg. ruptured ectopic pregnancy, blunt abdominal trauma
  • air in the abdomen - eg. post-laparoscopy, perforated viscus
  • subphrenic abscess and other hepatic conditions
  • cervical disc prolapse
  • cervical radiculopathy

non-traumatic causes of shoulder pain

septic arthritis

  • mainly elderly patients
  • important to exclude early - suspect in patients with painful shoulder movements without injury

inflammatory arthritis

subacromial bursitis

  • pain is on the lateral aspect of the shoulder and worse on abducting in the arc 60-90deg
  • minimal pain when adducted
  • pain is worse when washing hair or putting clothes out on clothes line

rotator cuff syndrome

  • rotator cuff syndrome is usually caused by a tendinopathy which results from a combination of ageing with decreased local micro-vascular supply perhaps caused by prolonged shoulder adduction. The role of impingement with the anatomic variant shape of the acromion is another possible aetiologic factor.
  • the impingement syndrome associated with rotator cuff injuries tends to cause pain with abduction ranging from 60-120° when the rotator cuff tendons are compressed against the anterior acromion and coracoacromial ligament.
  • strength of the anterior cuff (subscapularis) can be assessed using the lift-off test, which is performed with the arm internally rotated behind the back and the hand then pushes against resistance posteriorly (ie. liftig hand away from the back).
  • The posterior cuff (infraspinatus and teres minor) is isolated best in 90° of forward flexion with the elbow flexed to 90°, testing external rotation.
  • Winging of the scapula as the patient pushes against the wall indicates serratus anterior weakness.
  • supraspinatus strength can be tested with the elbow extended, the shoulder in full internal rotation, and the arm in the scapular plane (thumbs down position).

initial Mx of early rotator cuff disease

  • sleep with pillow between trunk and arm to avoid prolonged adduction
  • home exercise program
    • avoid adduction - ie do push ups, etc with arm at 45deg to the body
    • avoid thumbs down position when arm abducted
    • avoid lifting heavy weights overhead
    • avoid activities such as throwing a baseball that put a significant amount of stress on the tendons
    • start with shoulder shrugs, rowing, and push-ups
  • +/- corticosteroid injection into the subacromial space for severe pain

shoulder subluxation

  • this is mainly due to weak or damaged structures which usually maintain shoulder joint enlocation
  • initial Mx is sling, analgesics, avoiding postures which contribute
  • ongoing Mx is exercises to strengthen muscles, etc
  • surgical Mx may be indicated for chronic subluxations in younger, active patients

dead arm syndrome

  • sudden paralyzing pain & weakness in the arm in young athletes with glenohumeral joint instability (ie. recurrent shoulder dislocations)
  • transient radial pulse obliteration
  • transient shoulder subluxation in elevation and external rotation
  • 30% have co-existent thoracic outlet syndrome
  • 2/3rds have a Bankart lesion
    • an injury of the anterior (inferior) glenoid labrum due to repeated (anterior) shoulder dislocation
    • a pocket then forms at the front of the glenoid which allows the humeral head to dislocate into it
    • often accompanied by a Hill-Sachs lesion, which is damage to the posterior aspect of the humeral head.

frozen shoulder syndrome

primary frozen shoulder syndrome

  • mainly 40-70 year olds, women > men
  • 3% lifetime risk
  • main risk factor is a period of shoulder immobilization.

secondary frozen shoulder syndrome

  • may follow injury of surgery to the shoulder or upper limb or prolonged immobilisation
  • may occur in conditions such as diabetes, thyroid disease, inflammatory diseases, etc
  • may be due to certain medications such as flouroquinolone antibiotics, vaccination, antiretrovirals

adhesive capsulitis

  • often an end stage of rotator cuff syndrome

biceps tendonitis

  • focal tenderness over the biceps tendon
  • rest, non-steroidal anti-inflammatory drugs (NSAIDs), referral to physiotherapy
  • rupture of one of the proximal heads of the biceps may occur following trivial injury in the elderly as a result of degenerative change, and this may have initial pain followed by relief once it ruptures then the characteristic “Popeye” bulge in the biceps muscle appears. Proximal ruptures may not require surgical repair unless it occurs in younger patients.

other non-traumatic causes of shoulder pain

  • bone tumours or cysts - pathologic fracture of bone cysts, metastatic tumours

traumatic injuries

A-C joint strain / dislocation

  • usually results from a fall onto the lateral aspect of the shoulder which forces the acromion under the distal clavicle straining or tearing the acromio-clavicular ligaments
  • usually evidenced by swelling superiorly above the AC-joint
  • A-C joint Xrays may demonstrate a widening of the joint
  • initial ED Mx is broad arm sling and possible referral to orthopaedics

shoulder dislocation

fracture surgical neck of humerus

  • check for damage to the axillary nerve
  • most are managed by collar and cuff with weight of the elbow used to gravitationally straighten any angulation
  • many also apply a U-slab for “protection” and added gravitational weight
  • patient should be advised to avoid putting weight on the elbow

acute rotator cuff tear

  • red flags: suggested by trauma with acute painful shoulder, normal XRay and inability to actively abduct greater than 90deg (this is particularly sensitive if pain is not the limiting factor)
  • if suspected, and pain not settling within 1-2 weeks:
    • arrange USS or MRI scan (sensitivity of 100% and specificity of 95%) within 1-2wks of injury and if present, early surgery within 1 month of injury appears to be preferable
shoulderpain.txt · Last modified: 2020/06/29 12:33 by gary1