Rotator Cuff Tear Classification: Partial vs Full Thickness
Understand rotator cuff tear classification systems, partial vs full thickness tears, and how tear size affects treatment decisions.
Rotator cuff tears are classified using several grading systems that describe the depth, size, location, and tissue quality of the injury. Understanding these classifications helps you interpret your MRI report, have meaningful conversations with your surgeon, and understand the treatment options available for your specific tear type.
This guide covers the major classification systems used for rotator cuff tears, including the distinction between partial and full-thickness tears, the Ellman classification for partial tears, and the Patte classification for tendon retraction. For guidance on reading your shoulder MRI, see our article on how to read shoulder MRI.
Partial vs Full-Thickness Tears
The most fundamental distinction in rotator cuff tears is between partial-thickness and full-thickness injuries. A partial-thickness tear involves only part of the tendon depth — the defect does not extend completely through the tendon from one surface to the other. A full-thickness tear means the defect extends all the way through, creating a communication between the joint space below and the subacromial bursa above. On MRI, partial tears show focal bright signal on T2 images that affects only part of the tendon thickness, while full-thickness tears show bright signal extending completely through the tendon.
Partial-Thickness Tear Classification (Ellman)
The Ellman classification grades partial tears by location (Type A: articular-side, accounting for 60% of partial tears; Type B: bursal-side; Type C: intratendinous) and depth:
- Grade 1: less than 3 mm deep (less than 25% of tendon thickness)
- Grade 2: 3-6 mm deep (approximately 25-50% of tendon thickness)
- Grade 3: greater than 6 mm deep (more than 50% of tendon thickness)
Full-Thickness Tear Size Classification
Full-thickness tears are classified by their size measured in the anteroposterior dimension (front to back):
- Small: less than 1 cm — often responds well to conservative treatment
- Medium: 1-3 cm — may require surgery depending on symptoms and demands
- Large: 3-5 cm — typically requires surgical repair for active patients
- Massive: greater than 5 cm or involving two or more tendons — challenging to repair, may be irreparable
Patte Classification (Tendon Retraction)
The Patte classification describes the degree of tendon retraction in full-thickness tears — how far the torn tendon end has pulled away from its insertion on the humerus. This is assessed on coronal oblique MRI images:
- Stage 1: tendon stump near insertion (proximal to bony insertion) — good repair potential
- Stage 2: tendon stump retracted to the level of the humeral head — moderate repair difficulty
- Stage 3: tendon stump retracted to the level of the glenoid — difficult or impossible to repair primarily
Goutallier Classification (Fatty Infiltration)
When a rotator cuff tendon is torn, the muscle may undergo fatty infiltration — graded 0 (normal) to 4 (more fat than muscle) on sagittal T1 MRI. Grades 3-4 are largely irreversible and associated with poor surgical outcomes, potentially making tears irreparable. Early evaluation is important to prevent progressive infiltration.
Key Takeaways
- Partial tears affect only part of the tendon thickness; full-thickness tears extend completely through
- Ellman classification grades partial tears by location (articular, bursal, intratendinous) and depth (Grades 1-3)
- Full-thickness tears are sized as small (under 1 cm), medium (1-3 cm), large (3-5 cm), or massive (over 5 cm)
- Patte classification measures tendon retraction, which affects repair feasibility
- Goutallier grading of fatty infiltration (0-4) is critical because it is irreversible and affects surgical outcomes
- Timely treatment prevents progressive fatty infiltration that can make tears irreparable
Frequently Asked Questions
Can a partial rotator cuff tear become a full tear?
Yes. Partial tears can progress to full-thickness tears over time, particularly high-grade partial tears (Ellman Grade 3, greater than 50% thickness). Studies suggest approximately 25-50% of partial tears will progress over a 2-year period, especially in patients who continue high-demand overhead activities. Regular monitoring with ultrasound or MRI can track tear progression.
What makes a rotator cuff tear irreparable?
A tear is considered irreparable when the tendon has retracted significantly (Patte Stage 3), the muscle has undergone advanced fatty infiltration (Goutallier Grade 3-4), and the tissue quality is too poor to hold sutures. In these cases, alternative procedures such as superior capsular reconstruction, tendon transfer, or reverse total shoulder replacement may be considered.
Do all rotator cuff tears need surgery?
No. Studies show 60-80% of patients achieve satisfactory outcomes with physical therapy alone. Surgery is recommended for large tears in active patients and tears failing conservative treatment. See our shoulder rehab guide.
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