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Supplementary Core Sutures Increase Resistance to Gapping for Flexor Digitorum Profundus Tendon to Bone Surface Repair – An in vitro Biomechanical Analysis 
N. KUSANO
M. A. ZAEGEL
J. D. PLACZEK
R. H. GELBERMAN
M. J. SILVA
From the Department of Orthopaedic Surgery, Barnes-Jewish Hospital at Washington University, St. Louis, Missouri, USA
Correspondence: *Prof Matthew J. Silva, Ph.D., Department of Orthopaedic Surgery, Barnes-Jewish Hospital at Washington University, One Barnes-Jewish Hospital Plaza, Suite 11300 WP, St. Louis, MO 63110, USA. Tel.: +1 314 362 8597; fax: +1 314 362 0334. E-mail: silvam{at}wustl.edu
We evaluated the effects of two types of supplementary core sutures on the tensile properties and resistance to gap formation of flexor digitorum profundus (FDP) tendon-bone repairs. Forty-five human cadaver FDP tendons were sharply released from their insertion sites and repaired to bone utilizing one of three repair techniques: four-strand modified Becker core suture (Becker only), modified Becker plus a figure-of-eight supplementary core suture (Becker plus figure-of-eight), and modified Becker plus a supplementary core suture using a bone anchor (Becker plus anchor). Ultimate (maximum) force did not differ between repair groups. However, addition of a supplementary suture significantly increased repair-site stiffness and the 1, 2 and 3 mm gap forces, while decreasing the gap at 20 N compared to the Becker only suture (P<0.05). The only difference between the two supplementary suture groups was that the Becker plus anchor group had increased stiffness compared to the Becker plus figure-of-eight group. In conclusion, a supplementary figure-of-eight suture and a supplementary suture using a bone anchor provide enhanced resistance to gap formation for FDP tendon–bone repairs.
Key Words: FDP tendon tendon-bone repair gap formation
Journal of Hand Surgery (British and European Volume), Vol. 30, No. 3,
288-293 (2005)
DOI: 10.1016/J.JHSB.2005.01.002

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