Biomechanical study on the suture strength of ligament in cruciate ligament reconstruction.
OBJECTIVE
To test the suture strength on the tendon or ligament end and evaluate the stitch in the reconstruction of cruciate ligament and its clinical application.


METHODS
Twenty-four specimens of patellar tendon with free ends were divided into 3 groups: Group I (3 Krackow stitches), Group II (2 Krackow stitches) and Group III (2 Krackow stitches with the first stitch passing through the tendon tissue as a modified Krackow stitch). These 3 groups were further divided into 6 subgroups according to different suture materials, No 1 Ethilon or stainless steel wire (phi=0.4 mm). Tensile test was undertaken to find out the least stitches with efficient suture pattern.


RESULTS
Two Krackow locking stitches had stronger strength than 0.4 mm-diameter stainless steel wire. The fixation strength of 2 stitches with No 1 Ethilon was more than 80 N, superior to the failure strength of the material itself. The same strength was maintained if the first stitch was across the tendon tissue transversely. There was no statistically significant difference in the suture strength between 2 and 3 Krackow locking stitches.


CONCLUSIONS
The suture strength is greater than the failure strength of the suture material. Less suture exposure can be achieved when the first stitch is across the tendon tissue while maintaining a comparable strength to other sutures. To attain higher suture strength, stronger materials or multiple strands rather than more stitches are preferred. Therefore, a rapid early rehabilitation of range of motion (ROM) is possible and reliable in practice.
Zhang
Chun-li
CL
Department of Orthopaedics, Southwest Hospital, Chongqing 400038, China.
Li
Qi-hong
QH
Yang
Liu
L
D016118:Anterior Cruciate Ligament / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D001696:Biomechanical Phenomena; D002102:Cadaver; D005260:Female; D005500:Follow-Up Studies; D006085:Graft Survival; D006801:Humans; D008297:Male; D019651:Plastic Surgery Procedures / Q000379:methods; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D013536:Suture Techniques; D013718:Tensile Strength