A PASTA lesion is a partial tear of the rotator cuff, specifically on the articular side of the supraspinatus tendon where the tendon faces the shoulder joint. The full name often used in orthopedic practice is “partial articular-sided supraspinatus tendon avulsion.” Although the name sounds highly technical, the real issue is usually familiar: ongoing shoulder pain, weakness, difficulty with overhead activity, and reduced function in daily life.[1][2]
In Bangladesh, many patients with this type of problem simply say, “I have shoulder pain that is not getting better.” Some are treated for muscle strain for months. Some think it is only a posture problem. Others continue working through pain until sleep becomes difficult. In my practice, I often see patients reach me only after pain has persisted for a long time or when lifting the arm becomes more difficult.
One important point I want Bangladeshi patients to understand is that not all tendon tears are complete tears. A PASTA lesion is still a partial tear, but that does not mean it is always minor. Some partial tears respond well to non-surgical care, while others continue to cause pain and weakness and may need more structured intervention, including arthroscopic treatment in selected cases.[1][2]
What is a PASTA lesion?
The supraspinatus tendon is one of the most important parts of the rotator cuff. It helps lift the arm and stabilize the shoulder during movement. In a PASTA lesion, the tendon is partially torn on the joint side rather than through the full thickness.[1]
Why the name matters less than the function
Patients do not need to memorize the full orthopedic term. What matters is understanding that:
- the tendon is injured
- the tear is partial, not always complete
- pain and weakness can still be significant
- the treatment plan depends on symptoms, tear depth, and function
What causes a PASTA lesion?
A PASTA lesion may develop gradually or after a more specific strain or injury.
Common causes include
- repeated overhead activity
- long-term impingement
- shoulder overuse
- sports requiring repetitive arm motion
- degeneration with age
- lifting injury
- fall or traction injury in some cases
I often see similar patterns in office workers with poor shoulder mechanics, homemakers doing repeated overhead household work, manual workers, and active individuals who continue using a painful shoulder without assessment.
What symptoms does it cause?
This lesion often behaves like a painful rotator cuff injury. Many patients do not know whether they have tendinitis, bursitis, or a partial tear until imaging and examination clarify the problem.
Common symptoms
Patients may report:
- pain on the top or outer part of the shoulder
- pain during overhead movement
- night pain, especially when lying on the affected side
- weakness when lifting the arm
- pain with reaching backward or above shoulder level
- reduced confidence using the shoulder
- clicking or discomfort with motion
These symptoms overlap with conditions such as Supraspinatus Tear and broader Rotator Cuff Tear patterns, which is why diagnosis should not be based on symptoms alone.[1][2]
How is it different from a full rotator cuff tear?
This is a very common question.
Partial tear versus full-thickness tear
In a partial tear, some tendon fibers remain intact. In a full-thickness tear, the tendon is torn through its full depth and may detach more significantly from bone.[1]
Why that difference matters
The difference affects:
- treatment planning
- prognosis
- rehabilitation expectations
- whether surgery is more or less likely
However, a partial tear can still be very painful and functionally limiting, so it should not be dismissed.
How do I diagnose a PASTA lesion?
The diagnosis usually comes from a combination of clinical examination and imaging.
Clinical evaluation
When I evaluate patients with this problem, I usually look for:
- painful arc of movement
- weakness during certain shoulder tests
- tenderness
- impingement signs
- night pain
- reduced overhead function
- associated neck or posture-related issues
Many patients also describe overlapping symptoms with Shoulder Arthroscopy Surgery discussions because persistent cuff-related pain is one of the reasons arthroscopic evaluation may later be needed.
Imaging
X-rays
X-rays do not show the tendon directly but may help reveal other shoulder issues.
MRI
MRI is often the most useful imaging tool for identifying the depth and location of the partial tear, along with associated bursitis, impingement, or other rotator cuff pathology.[1][2]
