Clinical Orthopaedics and Related Research®

, Volume 470, Issue 9, pp 2513–2521 | Cite as

Does Augmentation with a Reinforced Fascia Patch Improve Rotator Cuff Repair Outcomes?

  • Andrew R. Baker
  • Jesse A. McCarron
  • Carmela D. Tan
  • Joseph P. Iannotti
  • Kathleen A. Derwin
Symposium: Allograft Research and Transplantation

Abstract

Background

Scaffold devices are used to augment rotator cuff repairs in humans. While the strength of a novel poly-L-lactic acid-reinforced (human) fascia patch has been documented, it is unclear whether such patches will enhance the strength or likelihood of healing of rotator cuff repairs.

Questions/purposes

In a canine shoulder model, we asked: Do tendon repairs augmented with a reinforced fascia patch have (1) increased biomechanical properties at Time 0 and (2) less tendon retraction and increased cross-sectional area and biomechanical properties after 12 weeks of healing compared to repairs without augmentation? (3) Do the biomechanical properties of tendon repairs reach normal values by 12 weeks of healing? And (4) is the host response associated with use of the reinforced fascia patch biocompatible?

Methods

Eleven dogs underwent bilateral shoulder surgery with partial release and acute repair of the infraspinatus tendon, one shoulder with augmentation and one without augmentation. Repair retraction, cross-sectional area, biomechanical properties, and biocompatibility were assessed at 12 weeks.

Results

At Time 0, the mean ± SD ultimate load of augmented repairs was 296 ± 130 N (46% ± 25%) more than nonaugmented repairs, with no difference in stiffness between groups. At 12 weeks, the ultimate load of augmented repairs averaged 192 ± 213 N (15% ± 16%) less than nonaugmented repairs, with no difference in stiffness between groups. At the tendon repair site at 12 weeks, the fascia patch showed a biocompatible host tissue response.

Conclusions

The biomechanical properties of repairs augmented with a reinforced fascia patch demonstrated greater ultimate load at Time 0 than nonaugmented repairs but remained essentially unchanged after 12 weeks of healing, despite improvements in the ultimate load of nonaugmented controls in the same time frame.

Clinical Relevance

Together with our previous work, these findings support the possibility that reinforced fascia patches would incorporate and provide (at least early) mechanical augmentation to rotator cuff repair in human patients.

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Copyright information

© The Association of Bone and Joint Surgeons® 2012

Authors and Affiliations

  • Andrew R. Baker
    • 1
  • Jesse A. McCarron
    • 2
  • Carmela D. Tan
    • 3
  • Joseph P. Iannotti
    • 1
    • 4
  • Kathleen A. Derwin
    • 1
    • 4
  1. 1.Department of Biomedical Engineering, Orthopaedic and Rheumatologic Research CenterCleveland Clinic FoundationClevelandUSA
  2. 2.Orthopedic Surgery Section Department of VA Medical CenterPortlandUSA
  3. 3.Department of Anatomic PathologyCleveland Clinic FoundationClevelandUSA
  4. 4.Department of Orthopaedic Surgery, Orthopaedic and Rheumatologic InstituteCleveland Clinic FoundationClevelandUSA

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