Biomechanical study on V-Y&nbsp; extending terminal tendon of extensor tendon for distal attachment inhuman cadaver hands

doi:10.13418/j.issn.1001-165x.2021.03.015

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Chinese Journal of Clinical Anatomy ›› 2021, Vol. 39 ›› Issue (3) : 330-335. DOI: 10.13418/j.issn.1001-165x.2021.03.015

Biomechanical study on V-Y extending terminal tendon of extensor tendon for distal attachment inhuman cadaver hands

Wang Gaofei^1,2, Zhang Zhufeng¹, Wei Zhuang¹

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Abstract

Objective　To discuss the biomechanics of V-Y extending terminal tendon (TT) for distal attachment to treat chronic mallet fingers (tendon-bone or partial bony).　Methods　Twelve fingers were randomly divided into the following two groups based upon the repair technique. A control group: 1mm TT was removed at the insertion, the distal TT was attached by pull-out; an experimental group: 1mm TT was removed at the insertion, the proximal portion of the TT was cut with a “V” incision which was then repaired in a “Y” fashion, and the distal TT was attached by pull-out. Biomechanics experimental outputs were calculated and statistically analyzed.　Results　As the rupture (load failure) occurred, the experimental group: 2 specimens (accounting for 33.3%) failed by suture breakages and 4 cases (accounting for 66.7%) failed by suture pulled out from the tendon at V-Y suture and all sutures were prolonged at attachment. Suture breakages happened in all specimens of the control group. There was significant difference between the two groups (P<0.05) in the load failure while no significant difference (P>0.05) in the maximum displacement. All sutures were prolonged at the attachment when the tendon-bone gap reached 1mm in both groups and the tendon-tendon was closely sticked at V-Y suture. There was significantly different between the two groups (P＜0.05) in the displacement while no significant difference (P>0.05) in the load and stiffness. Conclusions The load, displacement and stiffness of 1mm tendon-bone gap were more clinically meaningful than the repair failure force and maximum displacement. Reattachment with V-Y suture effectively extended TT and repaired tendon-bone gap, while unaffected the biomechanical properties of TT.

Key words

/ Chronic mallet finger / 　V-Y suture / 　Distal reattachment / 　Biomechanics

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Wang Gaofei, Zhang Zhufeng, Wei Zhuang. Biomechanical study on V-Y extending terminal tendon of extensor tendon for distal attachment inhuman cadaver hands[J]. Chinese Journal of Clinical Anatomy. 2021, 39(3): 330-335 https://doi.org/10.13418/j.issn.1001-165x.2021.03.015

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