Melis, Clin Orthop Relat Res 2010 - Natural History of Fatty Infiltration and Atrophy of the Supraspinatus Muscle in Rotator Cuff Tears

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Natural History of Fatty Infiltration and Atrophy of the Supraspinatus Muscle in Rotator Cuff Tears

Melis, Walch, et al.·Clin Orthop Relat Res·2010·250 citations·Retrospective cohort

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Background

In some patients nonoperative treatment of a rotator cuff tear is sufficient, while in others it is only the first stage of treatment prior to surgery. Fatty infiltration progresses throughout the nonoperative treatment although it is not known at what point fatty infiltration contributes to poor functional outcomes, absence of healing, or increased rerupture rates.

Purpose

We therefore identified factors related to the appearance of supraspinatus muscle fatty infiltration, determined the speed of appearance and progression of this phenomenon, and correlated fatty infiltration with muscular atrophy.

Methods

We retrospectively reviewed 1688 patients with rotator cuff tears and recorded the following: number of tendons torn, etiology of the tear, time between onset of shoulder symptoms and diagnosis of rotator cuff tear.
Fatty infiltration of the supraspinatus was graded using either CT or MRI classification.
Muscular atrophy was measured indirectly using the tangent sign.

Results

Moderate supraspinatus fatty infiltration appeared an average of 3 years after onset of symptoms and severe fatty infiltration at an average of 5 years after the onset of symptoms.
A positive tangent sign appeared at an average of 4.5 years after the onset of symptoms.

Conclusions

Our results suggest that rotator cuff repair should be performed before the appearance of fatty infiltration (Stage 2) and atrophy (positive tangent sign)-especially when the tear involves multiple tendons.

Level of evidence: Level IV, prognostic study. Copyright remains with the authors and publisher.

Natural History of Fatty Infiltration and Atrophy of the Supraspinatus Muscle in Rotator Cuff Tears

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Natural History of Fatty Infiltration and Atrophy of the Supraspinatus Muscle in Rotator Cuff Tears

Melis, Walch, et al.·Clin Orthop Relat Res·2010·250 citations·Retrospective cohort

Free Full Text·DOI·PubMed

|

Background

In some patients nonoperative treatment of a rotator cuff tear is sufficient, while in others it is only the first stage of treatment prior to surgery. Fatty infiltration progresses throughout the nonoperative treatment although it is not known at what point fatty infiltration contributes to poor functional outcomes, absence of healing, or increased rerupture rates.

Purpose

We therefore identified factors related to the appearance of supraspinatus muscle fatty infiltration, determined the speed of appearance and progression of this phenomenon, and correlated fatty infiltration with muscular atrophy.

Methods

We retrospectively reviewed 1688 patients with rotator cuff tears and recorded the following: number of tendons torn, etiology of the tear, time between onset of shoulder symptoms and diagnosis of rotator cuff tear.
Fatty infiltration of the supraspinatus was graded using either CT or MRI classification.
Muscular atrophy was measured indirectly using the tangent sign.

Results

Moderate supraspinatus fatty infiltration appeared an average of 3 years after onset of symptoms and severe fatty infiltration at an average of 5 years after the onset of symptoms.
A positive tangent sign appeared at an average of 4.5 years after the onset of symptoms.

Conclusions

Our results suggest that rotator cuff repair should be performed before the appearance of fatty infiltration (Stage 2) and atrophy (positive tangent sign)-especially when the tear involves multiple tendons.

Level of evidence: Level IV, prognostic study. Copyright remains with the authors and publisher.

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