J Korean Shoulder Elbow Soc.
2009 Dec;12(2):207-214.
Is the UU Stitch Really Alternative to Modified MA (Mason-Allen) Stitch for Rotator Cuff Repair?: Biomechanical Comparative Study of UU to Modified MA Stitch
- Affiliations
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- 1Department of Orthopedic Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Korea. shkoshko@naver.com
- 2School of Medical and Automotive Engineering, Ulsan University, Korea.
- 3NYU Hospital for Joint Diseases, NYU School of Medicine, USA.
Abstract
- PURPOSE
In arthroscopic rotator cuff repairs there are generally weak link in tendon suture interface, arthroscopic rotator cuff repairs can have higher retear rates than open repairs. The purpose of this study was to compare the strength of UU (Ulsan University) suture than open modified MA (Mason-Allen) suture when suture anchored into bone.
MATERIALS AND METHODS
The human supraspinatus tendons were harvested from the shoulder of the cadaver and split in 2 times, producing four tendons per one shoulder, for a total of 24 specimens. Two suture configurations (UU, MA) were randomized and checked on each set of tendons. Specimens were cyclically loaded under force control between 5 and 30 N at 0.25 Hz for fifty cycles. Each specimen was loaded to failure under displacement control at 1 mm/sec. Cyclic elongation, peak to peak displacement, stiffness, ultimate tensile load, mode of failure were checked.
RESULTS
No significant difference was found between two suture configuration with respect to peak to peak displacement, cyclic elongation, and stiffness. With regard to ultimate failure load, there were no significant difference statistically between the UU suture and modified MA suture (109.4 N, 110.6 N). The most common mode of failure between both sutures was suture pull-out through the tendon.
CONCLUSION
The UU suture and modified MA suture produced similar biomechanical properties.
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