Performance of antegrade suture passers according to tendon thickness.
OBJECTIVE
To determine the effect of tendon thickness on the needle penetration ability of four different designs of antegrade suture passers.


METHODS
Four antegrade suture passers were tested: (a) ExpresSew II (Depuy Mitek Inc., Raynham, MA), (b) Arthrex Scorpion (Arthrex, Naples, FL), (c) Concept (Linvatec Corp, Largo, FL), and (d) ElitePass (Smith and Nephew Endoscopy, Andover, MA). Bovine tendons were divided into five thickness groups: 3, 5, 7, 9 and 11 mm. At each tendon thickness, we performed 15 trials with the suture loaded and 15 unloaded per device. Successful needle penetration was recorded, and in case of success, the exit point of the needle was noted in relation to the superior arm of the grasping component.


RESULTS
All tested suture passing devices successfully penetrated tendon thicknesses of 3 and 5 mm. With the suture loaded, one device (Concept) only successfully penetrated 7 mm group tendons in 3/15 (20%) trials. Success rates at 9 mm with the suture loaded were 40% in ExpresSew II, 53% in Arthrex Scorpion, 0% in Concept and 53% in ElitePass. Among successful passages with a loaded suture in the 7 and 9 mm-groups, about 20-50% of passages were oblique, and the needle came out distal to the superior arm of grasping the component. No trial with any device succeeded with 11 mm tendons in the suture loading condition.


CONCLUSIONS
Using an antegrade suture passer during arthroscopic rotator cuff repair should be carefully considered when the torn end of the tendon is thicker than about 7-9 mm due to potential failure of needle penetration and/or too oblique a suture passage.


METHODS
Controlled laboratory study.
Department of Orthopedic Surgery, Chonnam National University College of Medicine, Chonnam National University Hospital, Gwangju, Korea.
Myung-Sun
MS
Kim
Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.
Dong Whan
DW
Kim
Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.
Young Eun
YE
Choi
Department of Bioengineering, University of California, San Diego, USA.
Larry
L
Bachman
Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.
Sae Hoon
SH
Kim
Antegrade suture passer; needle passage; rotator cuff repair; tendon thickness