Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooRotator Cuff Tear

Neck & Shoulder

What It Is

A rotator cuff tear is a common cause of shoulder pain and disability among adults. Each year, almost two million people in the United States see their doctor because of a rotator cuff tear (AAOS, n.d.a). A torn rotator cuff can weaken the shoulder, so daily activities such as combing your hair or getting dressed can become painful and difficult to do.

Rotator Cuff Tear Anatomy

The rotator cuff is made up of four muscles that join together as tendons and form a covering around the head of the humerus (the upper arm bone). The rotator cuff connects the humerus to the shoulder blade and helps you to rotate and lift your arm. While all four rotator cuff tendons can tear, the one most commonly torn by far is the supraspinatus (AAOS, n.d.a).

The supraspinatus sits above the spine of the shoulder blade, and attaches to the top of the arm bone (humerus) via a tendon. A rotator cuff tear most commonly relates to a tear of this tendon.

Tears Are Usually Classified Into the Following

  • Fraying of the supraspinatus tendon (usually along the top of the tendon).
  • Partial thickness tear (the tear goes partway through the thickness of the tendon).
  • Full thickness tear (the tear goes all the way through the tendon).
  • Rupture (the tendon is completely torn into two parts).
  • Retraction (the tendon has torn into two parts, and one part has pulled back towards the shoulder blade).

There is a lubricating sac known as the bursa that lies between the rotator cuff and the bone on the top of the shoulder (the acromion). The bursa allows the rotator cuff tendons to glide freely whenever you move your arm. When the tendons are damaged or injured, the bursa can also become painful and inflamed (AAOS, n.d.a). So it is not uncommon to have "subacromial bursitis" (inflammation of this bursa) with a rotator cuff tear.

The problem sits under the acromion, the bony point at the top of the shoulder blade. The acromion is joined to the collarbone at the AC joint (acromioclavicular joint), which sits next to the main ball and socket shoulder joint (AAOS, n.d.c).

How Do Rotator Cuff Tears Occur?

Rotator cuff tears usually occur in one of two ways: degeneration (wear) and trauma (injury) (AAOS, n.d.a).

  1. Degeneration: most tears are the result of the tendon slowly wearing down over time, which happens naturally as we age. Repeating the same shoulder movements again and again, and a reduced blood supply to the tendon as we get older, both contribute (AAOS, n.d.a). Bone spurs on the underside of the acromion can also rub on the tendon when you lift your arm (AAOS, n.d.c).
  2. Trauma: falling and landing on your shoulder or an outstretched arm, or lifting something too heavy with a jerking motion, can tear the rotator cuff. This type of tear can happen alongside other injuries, such as a broken collarbone or a dislocated shoulder (AAOS, n.d.a). Sports injuries can cause it too.

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

Book a session

At Fearless Heart, 25 Dupont St E in Uptown Waterloo, or as a home visit across Kitchener–Waterloo.