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Journal of Hand Surgery (British and European Volume)
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Articles

Biomechanical Analysis of a Step-Cut Technique for Flexor Tendon Repair

L. GORDON
J. L. GARRISON
J. C. CHENG
Y. K. LIU
R. P. NATHAN
D. G. LEVINSOHN

From the Department of Orthopaedic Surgery, Hand and Microsurgery Service, UCSF School of Medicine, San Francisco, U.S.A

Correspondence: Leonard Gordon, M.D., U.C.S.F. School of Medicine, 400 Parnassus, Suite 636, San Francisco, CA 94143, U.S.A.

We compared the strength of a new step-cut technique for flexor tendon repair with that of the widely used Kessler-Tajima technique, giving special attention to the relative contributions of the core and epitendinous sutures. 36 flexor digitorum profundus tendons from human cadavers were used. Corresponding digits from the same donor were paired, and the two tendons of each pair were placed in the Kessler-Tajima and step-cut groups, respectively. Each group had three subcategories of repair: (1) core repair alone; (2) epitendinous repair alone; and (3) full repair. In the Kessler-Tajima repair, the core stitch contributed more to ultimate tensile strength, while the epitendinous stitch contributed more to gap formation resistance. In the step-cut repair, however, the epitendinous stitch contributed more to both measures of strength. The full step-cut repair was 65% stronger in resisting gap formation and had 84% more ultimate tensile strength than the full Kessler-Tajima repair. We attribute the greater strength of the step-cut repair to the additional number of epitendinous loops, which lie perpendicular to the long axis of the tendon.

Journal of Hand Surgery (British and European Volume), Vol. 17, No. 3, 282-285 (1992)
DOI: 10.1016/0266-7681(92)90116-J
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