Abstract:
BACKGROUND::The current work sought to quantify pronation of the first metatarsal relative to the second metatarsal and of the proximal phalanx of the great toe relative to the first metatarsal. METHODS::Three-dimensional models were reconstructed from weightbearing computed tomography (CT) images (10 hallux valgus, 10 normal). The orientations of bones related to hallux valgus (HV) (ie, the phalanx, first and second metatarsals) were determined from coordinate systems established by selecting landmarks. After determining the hallux valgus and intermetatarsal angles, additional calculations geometrically determined the 3-dimensional (3D) angles using the aeronautical system of yaw-pitch-roll. The 3D geometrically determined angles were compared to the conventional plain radiographic angles. RESULTS::HV measurements taken with CT and 3D computer-aided design (3DCAD) geometric methods were the same as measurements taken from plain radiographs (P > .05). The average pronation of the first metatarsal relative to the second metatarsal was 8.2 degrees greater in the hallux valgus group (27.3 degrees) than in the normal group (19.1 degrees) (P = .044). A regression analysis of pronation vs intermetatarsal angle (IMA) was not found to be significant. There was also no correlation between pronation of the great toe and first metatarsal in the HV group. CONCLUSIONS::The pronation angle of the first metatarsal relative to the second metatarsal between normal and hallux valgus patients was larger in HV patients but was not well correlated with the IMA. CLINICAL RELEVANCE::The findings of this study indicate that pronation may need to be considered in the operative correction of hallux valgus for restoration of normal anatomy.
journal_name
Foot Ankle Intjournal_title
Foot & ankle internationalauthors
Campbell B,Miller MC,Williams L,Conti SFdoi
10.1177/1071100718793391subject
Has Abstractpub_date
2018-12-01 00:00:00pages
1449-1456issue
12eissn
1071-1007issn
1944-7876journal_volume
39pub_type
杂志文章abstract:BACKGROUND:More than 40 open procedures have been described for ankle arthrodesis, most with high complication rates. Since its description in 1983, arthroscopic ankle arthrodesis has become a viable option in selected patients. With one of the largest series in the literature, the purpose of the paper was to analyze t...
journal_title:Foot & ankle international
pub_type: 杂志文章
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journal_title:Foot & ankle international
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