Loop diameter of a modified Kessler locking-loop suture affects in vitro tensile strength and gapping characteristics of canine flexor tendon repairs

Author:

Chang Yi-Jen1,Duffy Daniel J.1,Moore George E.2

Affiliation:

1. Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC

2. Department of Veterinary Administration, College of Veterinary Medicine, Purdue University, West Lafayette, IN

Abstract

Abstract OBJECTIVE To evaluate effects of loop diameter of a modified Kessler locking-loop (LL) suture on in vitro tensile strength and gapping characteristics of canine flexor tendon repairs. SAMPLE 48 cadaveric superficial digital flexor tendons from 24 adult medium- to large-breed dogs. PROCEDURES Flexor tendons were randomly assigned to 4 groups (n = 12/group) and repaired with 2-0 polypropylene in a LL pattern with loops measuring 1, 2, 3, or 4 mm in diameter. Biomechanical loads, gap formation between tendon ends, and failure modes were evaluated and compared between groups. RESULTS Increasing loop diameter from 1 to 4 mm significantly increased yield (P = .048), peak (P < .001), and failure (P < .001) loads. There were no significant differences in yield, peak, and failure loads between 1- and 2-mm loops. Load to 3-mm gap formation was significantly (P < .001) greater for 4-mm loops, compared with 1-, 2-, and 3-mm loops. Failure mode did not differ significantly among experimental groups, with 46 of 48 (96%) of constructs failing because of suture breakage. CLINICAL RELEVANCE Loop diameter of a LL suture pattern is an important biomechanical variable that influences construct biomechanics of canine tendon suture repairs. Loop diameters > 3 mm are recommended when the size of the tendon allows. Further studies are necessary to determine the in vivo effect of these findings, particularly the effects on tendon blood supply.

Publisher

American Veterinary Medical Association (AVMA)

Subject

General Veterinary,General Medicine

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