Biomechanical Evaluation of Different Fixation Methods for Percutaneous Extracapsular Transverse Cervical Metatarsal Osteotomy in a Hallux Valgus Sawbone Model

Wagner, Pablo; Wagner, Emilio; Pinochet, Miguel; Salinas, David; Lam, Peter

Publication:
Biomechanical Evaluation of Different Fixation Methods for Percutaneous Extracapsular Transverse Cervical Metatarsal Osteotomy in a Hallux Valgus Sawbone Model

dc.contributor.author	Wagner, Pablo
dc.contributor.author	Wagner, Emilio
dc.contributor.author	Pinochet, Miguel
dc.contributor.author	Salinas, David
dc.contributor.author	Lam, Peter
dc.date.accessioned	2025-08-21T16:02:39Z
dc.date.available	2025-08-21T16:02:39Z
dc.date.issued	2024
dc.description.abstract	Background: There is limited literature available that provide information about fixation methods for minimally invasive hallux valgus osteotomies. Our objective was to evaluate the strength of different fixation methods for a percutaneous extracapsular transverse cervical metatarsal (PTCM) osteotomy in a sawbone model. Methods: Thirty solid foam sawbone foot models were used. Percutaneous extracapsular transverse cervical metatarsal osteotomies were performed and fixed in a standardized fashion in 6 different groups: (1) one 4.0-mm screw; (2) 2 (one 4.0-mm and one 3.0-mm) parallel screws; (3) 2 (one 4.0-mm and one 3.0-mm) divergent screws; (4) same as group 3, but with lateral metatarsal head cortex purchase with the 4.0-mm screw; (5) same as group 4, but with two 4.0-mm screws; (6) same as group 5, but with two 3.5-mm screws. Cyclic and load to failure testing were performed applying a plantar load to the metatarsal head. The measured variables were stiffness and force needed to create deformity using a Zwick Roell Universal Testing Machine. Results: Group 1 failed as a result of rotational instability in cyclic testing. In load to failure testing, group 3 did not achieve difference compared with group 2 (P = .09) (181 vs 131 N). Group 4 was stronger (P = .02) (250 N) than groups 1-3. Group 5 did not show differences relative to group 4 (P = .1) (223 N). Group 6 was stronger only than groups 1 and 2 (P = .01) (193 N). Conclusion: In this sawbones-based study, we found that the use of two 4.0-mm screws or use of a 3.0-mm screw and a 4.0-mm screw with lateral first metatarsal head cortical purchase was superior to other screw configurations.
dc.description.version	Versión Publicada
dc.identifier.citation	Wagner P, Wagner E, Pinochet M, Salinas D, Lam P. Biomechanical Evaluation of Different Fixation Methods for Percutaneous Extracapsular Transverse Cervical Metatarsal Osteotomy in a Hallux Valgus Sawbone Model. Foot Ankle Orthop. 2024 Dec 13;9(4):24730114241303768. doi: 10.1177/24730114241303768
dc.identifier.doi	https://doi.org/10.1177/24730114241303768
dc.identifier.uri	https://hdl.handle.net/11447/10205
dc.language.iso	en
dc.title	Biomechanical Evaluation of Different Fixation Methods for Percutaneous Extracapsular Transverse Cervical Metatarsal Osteotomy in a Hallux Valgus Sawbone Model
dc.type	Article
dcterms.accessRights	Acceso Abierto
dcterms.source	Foot & ankle orthopaedics
dspace.entity.type	Publication
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relation.isAuthorOfPublication	13644119-5fe2-4655-94e2-760522325807
relation.isAuthorOfPublication.latestForDiscovery	be1101a9-b3c7-41ef-a2b7-f3a52a7e5c4f