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  • Supraspinatus tendonitis
  • Infraspinatus tendonitis

  • 726.10 Disorders of bursae and tendons in shoulder region, unspecified
  • 840.3 Infraspinatus (muscle) (tendon) sprain
  • 840.4 Rotator cuff (capsule) sprain
  • 840.5 Subscapularis (muscle) sprain
  • 840.6 Supraspinatus (muscle) (tendon) sprain

  • S43.429A Sprain of unspecified rotator cuff capsule, initial encounter
  • S43.80XA Sprain of other specified parts of unspecified shoulder girdle, initial encounter


  • Inflammation, irritation, swelling of one or more of the rotator cuff tendons
    • Supraspinatus muscle
    • Infraspinatus muscle
    • Teres minor muscle
    • Subscapularis muscle
  • Occurs most often from repetitive motion injuries or impingement syndrome but can occur with a sudden strain/stress to the tendon.
  • Early stages: The tendon becomes swollen and red, and as the tendonitis develops, the tendon sheath may thicken
  • Late stages: Chronic inflammation may result in fraying of the tendon (tendinosis) and could progress to rupture with long term inflammation.
  • Shoulder pain and dysfunction due to compression and abrasion of one or more of the rotator cuff tendons
  • Impingement is the most commonly diagnosed shoulder problem and likely has numerous potential mechanisms, which can impact both treatment and prognosis.

Essentials of Diagnosis

  • Multifactorial and thought to be related to intrinsic and/or extrinsic mechanisms.
    • Extrinsic mechanisms (extratendinous, caused by decreased sub-acromial space and subsequent micro-trauma with repetitive movements)
      • Mechanical wear under the coracoacromial arch
      • Aberrant movement patterns due to rotator cuff and/or periscapular muscular dysfunction
      • Capsular abnormalities
        • Capsular tightness (particularly posterior capsule)
        • Capsular laxity (poor humeral head dynamic control)
      • Sub-optimal posture
        • Muscle imbalances
      • Overuse/repetitive motions occurring at more than 90 degrees of elevation
    • Intrinsic factors (directly associated with the narrowing of the sub-acromial space)
      • Vascular supply/changes to the cuff tendons
      • Acromial morphology (structural variations)
        • Type I (flat)
        • Type II (curved)
        • Type III hooked)
      • Degenerative and/or structural changes to the AC joint
      • Other trophic changes in the coracoacromial arch or humeral head
  • Classification
    • Primary impingement is usually associated with degenerative changes to any of the following tissues:
      • Rotator cuff tendons
      • Acromioclavicular (AC) joint
      • Coracoacromial arch
    • Secondary impingement is the result of muscle imbalances and/or joint instability, which can result in altered dynamics and subsequent secondary impingement.
    • A third class of impingement, not subacromial in nature, is referred to as internal impingement and occurs between the undersurface (articular side) of the rotator cuff tendons and the posterior/superior surface of the labrum in the position of abduction and external rotation that occurs with throwing.
    • Regardless of the specific classification, all types of impingement are proposed to be mechanisms of rotator cuff and biceps tendinopathy.

General Considerations

  • The rotator cuff stabilizes and steers the head of the humerus in the glenoid of the scapular at the glenohumeral (GH) joint.
  • Rotator cuff and possibly the biceps are thought to compresses the head of the humerus into ...

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