Subacromial Bursitis

Upper Limb

Overview

Subacromial bursitis is inflammation of the bursa located between the supraspinatus tendon and the acromion process, causing localized pain and restricted shoulder movement. This condition frequently coexists with rotator cuff dysfunction and impingement syndrome, resulting in painful arc of motion and night pain. Early intervention with manual therapy and targeted rehabilitation can significantly improve outcomes and prevent chronic shoulder disability.

Pathophysiology

The subacromial bursa acts as a lubricating sac to facilitate smooth gliding between the rotator cuff tendons and the overlying acromion. Repetitive overhead activities, poor scapular kinematics, rotator cuff weakness, or direct trauma cause bursal inflammation through mechanical irritation and microtrauma. Inflammatory mediators accumulate within the bursa, thickening the synovial lining and reducing available subacromial space, leading to further mechanical impingement and pain with arm elevation.

Patient Education

Modifying aggravating overhead activities while maintaining pain-free movement patterns is crucial; progressive strengthening of the rotator cuff and scapular stabilizers addresses underlying biomechanical dysfunction and prevents recurrence.

Typical Presentation

Site

Anterolateral shoulder, localized to the subacromial space; pain may radiate to the lateral upper arm

Quality

Dull, aching, or sharp mechanical pain worsened by specific movements; may feel like catching or pinching sensation

Intensity

Mild to moderate (3-7/10) with acute flare-ups potentially reaching severe levels (7-9/10); typically worse in morning and with activity

Aggravating

Overhead reaching, throwing, swimming, painting, sleeping on affected side, cross-body adduction, repetitive lifting

Relieving

Rest, NSAIDs, ice application, gentle pendulum exercises, scapular support, avoiding provocative positions

Associated

Reduced active range of motion (especially abduction 60-120 degrees), weak rotator cuff on manual testing, positive Neer impingement sign, possible scapular dyskinesis, night pain disrupting sleep

Orthopaedic Tests

Neer Impingement Sign

Procedure

Patient is seated or standing. Passively flex the shoulder to 90° while internally rotating the humerus (thumb pointing downward). The examiner pushes the scapula down with the other hand. A positive test reproduces anterior shoulder pain.

Positive Finding

Reproduction of anterior shoulder pain during passive shoulder flexion with scapular depression

Sensitivity / Specificity

72% / 60%

Neer, 1972, Journal of Bone and Joint Surgery; Hegedus et al., 2015, BJSM

Interpretation

Suggests subacromial impingement; may indicate subacromial bursitis, rotator cuff pathology, or both. Low specificity means positive result does not rule in diagnosis reliably.

Hawkins-Kennedy Impingement Test

Procedure

Patient is seated or standing. Shoulder is flexed to 90° and internally rotated passively by the examiner. A positive test reproduces pain in the anterior shoulder region.

Positive Finding

Reproduction of anterior or lateral shoulder pain with 90° flexion and internal rotation

Sensitivity / Specificity

72% / 44%

Hawkins & Kennedy, 1980, Journal of Bone and Joint Surgery; Hegedus et al., 2015, BJSM

Interpretation

Indicates subacromial impingement; similar sensitivity to Neer test but lower specificity. Positive result suggests need for further imaging or differential diagnosis.

Painful Arc Sign (Cocking Test)

Procedure

Patient performs active abduction of the shoulder in the scapular plane (0° to 180°). Examiner observes for reproduction of pain during the middle arc of motion (typically 60°–120°).

Positive Finding

Reproduction of pain between 60° and 120° of abduction, with relief at end-range

Sensitivity / Specificity

53% / 80%

Calis et al., 2000, American Journal of Physical Medicine & Rehabilitation; Hegedus et al., 2015, BJSM

Interpretation

Suggests subacromial impingement or bursal irritation. High specificity makes this a useful confirmatory test; negative result helps rule out subacromial pathology.

Subacromial Space Palpation

Procedure

Patient is seated with arm at rest. Examiner palpates just inferior to the anterolateral acromion while patient passively abducts the arm to 60°–90°. Tenderness or reproduction of pain suggests bursal irritation.

Positive Finding

Local tenderness or pain reproduction over the subacromial space during palpation or passive movement

Sensitivity / Specificity

Unknown / Unknown

Interpretation

Direct palpation may identify localized tenderness consistent with bursitis; however, lacks well-established diagnostic accuracy. Most useful as part of multimodal clinical assessment.

Resisted Abduction Test

Procedure

Patient is seated with shoulder abducted to 90° and externally rotated slightly (neutral position). Examiner applies downward resistance while patient attempts to maintain abduction. Pain or weakness is noted.

Positive Finding

Pain with resisted abduction, particularly in the range of 75°–110°; may indicate rotator cuff involvement or bursal irritation

Sensitivity / Specificity

Unknown / Unknown

Interpretation

Helps differentiate between subacromial bursitis and rotator cuff tendinopathy; pain suggests bursal irritation or supraspinatus involvement. Weakness may indicate cuff pathology.

Empty Can Test (Supraspinatus Strength)

Procedure

Patient stands with shoulders abducted to 90°, elbows extended, and thumbs pointing downward (internally rotated). Examiner applies downward pressure while patient resists. Pain or weakness is noted.

Positive Finding

Pain or weakness during resistance; reproduction of shoulder pain indicates positive result

Sensitivity / Specificity

65% / 54%

Jobe & Jobe, 1983, Operative Techniques in Upper Extremity Sports Injuries; Hegedus et al., 2012, JOSPT

Interpretation

Primary purpose is to assess supraspinatus strength and tendinopathy, but pain may also reflect subacromial bursal involvement. Not specific for bursitis alone.

⚠ Red Flags

  • •Sudden onset with severe unremitting pain unresponsive to conservative care lasting >6 weeks
  • •Neurovascular symptoms (numbness, tingling, discoloration, temperature changes)
  • •History of trauma with suspicion of rotator cuff tear (positive drop arm test)
  • •Signs of systemic infection (fever, constitutional symptoms, rapidly worsening swelling)
  • •Inability to actively lift arm from side with negative rotator cuff strength testing
  • •Imaging findings suggesting full-thickness rotator cuff tear requiring surgical intervention

⚡ Yellow Flags

  • •High baseline anxiety or catastrophizing about shoulder injury and prognosis
  • •Significant work demands involving overhead activities with poor ergonomic support
  • •Poor compliance with prescribed exercise program or negative beliefs about activity
  • •Multiple previous shoulder injuries suggesting chronic pain cycle
  • •Depression or low mood affecting motivation for rehabilitation
  • •Lack of social support for activity modification and recovery

Osteopathic Techniques

Region

Supraspinatus and infraspinatus

Technique

Soft Tissue

Rationale

Specific soft tissue mobilization to the rotator cuff muscles reduces muscular tension, improves local circulation, decreases inflammatory mediators, and restores fascial gliding to reduce subacromial impingement

Region

Glenohumeral joint

Technique

Articulation

Rationale

Gentle oscillatory movements within pain-free range restore joint nutrition, maintain synovial fluid distribution throughout the capsule, and normalize proprioceptive feedback to facilitate appropriate scapulohumeral rhythm

Region

Scapulothoracic articulation

Technique

Soft Tissue

Rationale

Mobilization of serratus anterior, trapezius, and rhomboid muscles corrects scapular dyskinesis patterns that reduce subacromial space and perpetuate bursal irritation

Region

Cervicothoracic spine and first ribs

Technique

HVLA

Rationale

Restoring cervicothoracic mobility and rib mechanics improves scapular positioning and upper thoracic extension, reducing compensatory shoulder elevation and subacromial crowding

Region

Acromioclavicular and sternoclavicular joints

Technique

Articulation

Rationale

Normalizing clavicular mechanics ensures optimal scapular orientation and acromion positioning, reducing structural impingement of the subacromial space

Region

Glenohumeral joint capsule and surrounding fasciae

Technique

Functional

Rationale

Functional technique in positions of ease reduces capsular tension, enhances joint centration, and facilitates neuromuscular re-education for improved stability and load distribution

Add-On Approaches

Chinese Medicine

Acupuncture to LI15 (Jianyu), SI9 (Jianzhen), and local ashi points combined with moxibustion supports Qi and blood circulation to resolve inflammation and pain in the shoulder region

Chiropractic

Scapular mobilization, glenohumeral joint manipulation, and thoracic spine adjustment to improve kinetic chain mechanics and reduce subacromial impingement

Physiotherapy

Progressive rotator cuff strengthening (external/internal rotation), scapular stabilization exercises (Y-T-W raises, prone horizontal abduction), proprioceptive training, and activity-specific functional training

Remedial Massage

Deep tissue massage to rotator cuff, deltoid, and scapular musculature combined with trigger point release and myofascial techniques to reduce muscular guarding and improve shoulder mechanics

Rehabilitation Exercises

Pendulum Circles

Range of MotionBeginner

Cross-Body Shoulder Stretch

StretchingBeginner

Sleeper Stretch for Infraspinatus

StretchingBeginner

Supine External Rotation with Resistance Band

StrengtheningBeginner

Standing Internal Rotation with Resistance Band

StrengtheningBeginner

Prone Horizontal Abduction at 90 Degrees

PosturalIntermediate

Side-Lying External Rotation

StrengtheningIntermediate

Y-T-W Raises (Wall or Prone)

PosturalIntermediate

Quadruped Shoulder Stabilization (Bird Dog Variation)

BalanceIntermediate

Prone Horizontal Abduction with External Rotation (90/90)

StrengtheningAdvanced

Standing Cable External Rotation at 0 Degrees Abduction

PosturalAdvanced

Controlled Overhead Reaching Pattern with Progressive Load

CardiovascularAdvanced

Referral Criteria

  • •Failure to improve after 4-6 weeks of consistent conservative management with manual therapy and exercise
  • •Positive imaging findings (MRI/ultrasound) confirming full-thickness rotator cuff tear or significant subacromial narrowing
  • •Persistent severe night pain preventing sleep despite treatment
  • •Signs of neurological compromise or vascular insufficiency
  • •Acute trauma with immediate inability to move shoulder suggesting acute rotator cuff injury
  • •Suspicion of other pathology (AC joint osteoarthritis, calcific tendinopathy, labral pathology)
  • •Patient preference for corticosteroid injection as adjunctive intervention
  • •Functional demands requiring surgical intervention for return to occupation or sport