Paper 50: Biceps Autograft Patch Augmentation for Rotator Cuff Repair: The Effect of Point of Care Compression on Tenocyte Viability.

Abstract

Objectives: Augmentation of rotator cuff repair in patients at risk for retear has gained popularity. These techniques have generally consisted of allograft and xenograft patches. Recently, use of an autograft biceps from the normally discarded portion after biceps tenodesis was described as a potential patch for rotator cuff repair augmentation. As an autograft, it is free and readily available. The original description prepared the patch by placing it through a commercial skin graft preparation station. This technique results in a significant decrease in tenocyte viability, however, and results in a patch that is difficult to work with. Recently, an autograft compression plate has been employed to use as a point of care processor for adapting the discarded long head of the biceps after tenodesis into an autograft patch. The purpose of this study was to evaluate the feasibility of this point of care graft preparation method, and to specifically evaluate its effect on tenocyte viability in patients undergoing patch augmentation for rotator cuff repair. Methods: We reviewed the medical records of consecutive patients who underwent biceps tenodesis for either rotator cuff repair or anatomic shoulder arthroplasty. After tenodesis, and after 27 mm of the long head of the biceps was secured for compression into the patch, the remaining length of normally discarded tendon was longitudinally split, resulting in 2 equal lengths of remnant tendon from the same zone of the tendon. One sample was sent to pathology with no preparation, and the other was prepared as a biceps autograft patch using the autograft compression plate according to the manufacturer’s recommendations. Once prepared, this second biceps sample was sent to pathology along with the first. The request was to evaluate for tenocyte viability. Pathologists were not told which sample was compressed. Records were reviewed to determine if biceps tendon samples were viable at the time of harvest, and whether the compression process affected a change between the first and second specimen. Results: 20 consecutive patients were reviewed. All 20 biceps produced usable patches. The remnant biceps samples that were sent to pathology revealed the following: Sixteen of the 20 patients had biceps tenocyte viability that were read out as completely normal in both the compressed and non compressed samples. Of the 4 patients that did show some degree of tenocyte necrosis or death, 3 of the patients had identical findings between the compressed and non-compressed samples. Only 1/20 (5%) of the patients showed a difference between the compressed sample and the non-compressed sample, with the compressed sample demonstrating small areas of “patchy necrosis” while the non compressed sample showed normal tendon in that specimen. Conclusions: Compression of the long head of the biceps results in an autograft patch that is a promising option in rotator cuff augmentation. The method of compression plating to process the long head of the biceps remnant into an augmentation patch appears to have no significant effect on tenocyte viability, suggesting that the patch has live tenocytes at the time of point of care augmentation.