A New Mini-External Fixator for Treating Hallux Valgus: A Preclinical, Biomechanical Study

Abstract Proximal metatarsal osteotomy is the most effective technique for correcting hallux valgus deformities, especially in metatarsus primus varus. However, these surgeries are technically demanding and prone to complications, such as nonunion, implant failure, and unexpected extension of the os...

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Bibliographic Details
Published in:The Journal of foot and ankle surgery 2016-01, Vol.55 (1), p.35-38
Main Authors: Erdil, Mehmet, MD, Ceylan, Hasan Huseyin, MD, Polat, Gokhan, MD, Kara, Deniz, MD, Bozdag, Ergun, PhD, Sunbuloglu, Emin, PhD
Format: Article
Language:English
Subjects:
Biomechanical Phenomena
biomechanical stability
Bone Plates
Bone Screws
Cadaver
cannulated screw
external fixator
External Fixators
hallux valgus
Hallux Valgus - physiopathology
Hallux Valgus - surgery
Humans
Metatarsal Bones - physiopathology
Metatarsal Bones - surgery
Orthopedics
Osteotomy - methods
proximal osteotomy
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Summary:Abstract Proximal metatarsal osteotomy is the most effective technique for correcting hallux valgus deformities, especially in metatarsus primus varus. However, these surgeries are technically demanding and prone to complications, such as nonunion, implant failure, and unexpected extension of the osteotomy to the tarsometatarsal joint. In a preclinical study, we evaluated the biomechanical properties of the fixator and compared it with compression screws for treating hallux valgus with a proximal metatarsal osteotomy. Of 18 metatarsal composite bone models proximally osteotomized, 9 were fixed with a headless compression screw and 9 with the mini-external fixator. A dorsal angulation of 10° and displacement of 10 mm were defined as the failure threshold values. Construct stiffness and the amount of interfragmentary angulation were calculated at various load cycles. All screw models failed before completing 1000 load cycles. In the fixator group, only 2 of 9 models (22.2%) failed before 1000 cycles, both between the 600th and 700th load cycles. The stability of fixation differed significantly between the groups ( p  
ISSN:1067-2516
1542-2224
DOI:10.1053/j.jfas.2015.04.018