Sunday, November 21, 2021

Anatomical variants of the medioplantar oblique ligament and inferoplantar longitudinal ligament: an MRI study

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Surg Radiol Anat. 2021 Nov 20. doi: 10.1007/s00276-021-02860-0. Online ahead of print.

ABSTRACT

PURPOSE: The spring ligament complex (SL) is the chief static stabilizer of the medial longitudinal foot arch. The occurrence of normal anatomical variants may influence radiological diagnostics and surgical treatment. The aim of this study was to evaluate anatomical variants of the part of SL located inferior to the talar head (i-SL), medioplantar oblique ligament (MPO) and infer oplantar longitudinal ligament (IPL).

METHODS: We included 220 MRI examinations of the ankle performed on a 3.0 T engine. Only patients with a normal SL were included. Two musculoskeletal radiologists assessed the examinations and Cohen's kappa was used to assess agreement. Differences between groups were assessed using the chi-squared test; p < 0.05 was considered as significant. The final decision was made by consensus.

RESULTS: Most commonly, i-SL was composed of the two ligaments IPL and MPO n = 167 (75.9%); in this group, bifid ligaments occurred in 19.2%, most commonly in the MPO. A branch to the os cuboideum was seen in n = 17 (10.2%). Three ligaments were seen in n = 52 (23.6%). In this group, bifid ligaments occurred in 13.5%; most commonly, the IPL was bifid and a branch to the os cuboideum was noted in n = 6 (11.5%). In one case, n = 1 (0.04%), we identified MPO, IPL and two accessory ligaments. No significant relationship was noted between the number of li gaments, the presence of bifid ligaments and side or gender (p > 0.05).

CONCLUSION: More than two aligaments were seen in 24.1% of examined cases, the most common variant was the presence of MPO, IPL and one accessory ligament.

PMID:34800154 | DOI:10.1007/s00276-021-02860-0

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