Gerber et al. released the infraspinatus tendon in six sheep and prevented healing for 40 weeks to model chronic rotator cuff retraction. They then performed delayed repair and followed animals for 35 more weeks. The study asks whether repair can reverse muscle atrophy and fatty infiltration.
Goutallier grade on preoperative CT or MRI is not just an imaging finding — this paper explains the biology behind it. Those fat cells have invaded the muscle architecture and will not leave after repair. Repair restores the tendon-bone connection but cannot undo muscle-level damage that accumulated during retraction.
When you see a chronic, retracted tear with advanced fatty infiltration, counsel patients that repair may improve pain and prevent further retraction, but functional recovery is limited by muscle quality. Not surgical technique. The structural changes are fixed at the time of repair.
This paper is the experimental foundation for why Goutallier stage and retraction grade are used as surgical decision thresholds, and why tendon transfer or arthroplasty may be preferred over repair when fatty infiltration is advanced.
Gerber et al. released the infraspinatus tendon in six sheep and prevented healing for 40 weeks to model chronic rotator cuff retraction. They then performed delayed repair and followed animals for 35 more weeks. The study asks whether repair can reverse muscle atrophy and fatty infiltration.
Goutallier grade on preoperative CT or MRI is not just an imaging finding — this paper explains the biology behind it. Those fat cells have invaded the muscle architecture and will not leave after repair. Repair restores the tendon-bone connection but cannot undo muscle-level damage that accumulated during retraction.
When you see a chronic, retracted tear with advanced fatty infiltration, counsel patients that repair may improve pain and prevent further retraction, but functional recovery is limited by muscle quality. Not surgical technique. The structural changes are fixed at the time of repair.
This paper is the experimental foundation for why Goutallier stage and retraction grade are used as surgical decision thresholds, and why tendon transfer or arthroplasty may be preferred over repair when fatty infiltration is advanced.