Mechanical Comparison of Two Types of Fixation for Ludloff Oblique First Metatarsal Osteotomy

TY - JOUR

T1 - Mechanical Comparison of Two Types of Fixation for Ludloff Oblique First Metatarsal Osteotomy

AU - Tsilikas, Stavros P.

AU - Stamatis, Emmanouil D.

AU - Kourkoulis, Stavros K.

AU - Mitousoudis, Athanasios S.

AU - Chatzistergos, Panayiotis E.

AU - Papagelopoulos, Panayiotis J.

PY - 2011/11

Y1 - 2011/11

N2 - The Ludloff oblique metatarsal osteotomy is an effective method to correct hallux valgus deformity, although a number of problems have been associated with it, including inherent instability, delayed union, dorsal malunion, and fixation failure. The purpose of the present study was to compare the mechanical characteristics of fixation of the Ludloff osteotomy in 20 identical synthetic bone models, 10 fixated using 2 screws (group I) and 10 fixated using 2 screws augmented with a mini locking plate (group II). Each specimen was loaded to failure, and the mean average load to failure, stiffness, and absorbed energy to failure were compared using unpaired Student's t test. The mean average stiffness of the Ludloff osteotomy fixed with 2 screws (group I) and with the supplementary mini locking plate (group II) was 172.7 ± 31.7 N/mm and 193.3 ± 39 N/mm, respectively (p = .21). The mean average load to failure for groups I and II was 278.4 ± 64.4 N and 356.2 ± 77.9 N, respectively (p = .025). The mean average energy absorbed before failure for groups I and II was 506.7 ± 206.4 Nmm and 769.8 ± 339.4 Nmm, respectively (p = .05). The use of a medially applied supplementary mini locking plate offers a simple and effective method to improve the mechanical stability of the Ludloff oblique osteotomy.

AB - The Ludloff oblique metatarsal osteotomy is an effective method to correct hallux valgus deformity, although a number of problems have been associated with it, including inherent instability, delayed union, dorsal malunion, and fixation failure. The purpose of the present study was to compare the mechanical characteristics of fixation of the Ludloff osteotomy in 20 identical synthetic bone models, 10 fixated using 2 screws (group I) and 10 fixated using 2 screws augmented with a mini locking plate (group II). Each specimen was loaded to failure, and the mean average load to failure, stiffness, and absorbed energy to failure were compared using unpaired Student's t test. The mean average stiffness of the Ludloff osteotomy fixed with 2 screws (group I) and with the supplementary mini locking plate (group II) was 172.7 ± 31.7 N/mm and 193.3 ± 39 N/mm, respectively (p = .21). The mean average load to failure for groups I and II was 278.4 ± 64.4 N and 356.2 ± 77.9 N, respectively (p = .025). The mean average energy absorbed before failure for groups I and II was 506.7 ± 206.4 Nmm and 769.8 ± 339.4 Nmm, respectively (p = .05). The use of a medially applied supplementary mini locking plate offers a simple and effective method to improve the mechanical stability of the Ludloff oblique osteotomy.

KW - Bone

KW - Hallux valgus

KW - Interfragmental compression screw

KW - Locking plate

KW - Surgery

UR - https://www.scopus.com/pages/publications/80054915254

U2 - 10.1053/j.jfas.2011.06.006

DO - 10.1053/j.jfas.2011.06.006

M3 - Article

C2 - 21813302

AN - SCOPUS:80054915254

SN - 1067-2516

VL - 50

SP - 699

EP - 702

JO - Journal of Foot and Ankle Surgery

JF - Journal of Foot and Ankle Surgery

IS - 6

ER -