Subtle, or ligamentous, Lisfranc injuries occur following low-energy trauma to the midfoot and can be debilitating. Since they are ligamentous, they may not heal, requiring arthrodesis in some cases. Certain mortise anatomic characteristics on radiographs have been shown to be associated with a predisposition to the ligamentous subtype of Lisfranc injuries. It is not known whether there are other morphometric characteristics, such as arch height or the relative length of the second metatarsal, that can similarly influence the predisposition to these injuries.
The present retrospective matched case-control study involved fifty-two control subjects and twenty-six patients with ligamentous Lisfranc injuries treated from 2006 to 2010 at two institutions. Clinical and radiographic data (second metatarsal length relative to foot length, first intermetatarsal angle, navicular-cuboid overlap relative to cuboid vertical height, first metatarsal-talus angle, and calcaneal pitch angle) were examined for the existence of significant differences between control and Lisfranc subjects. Logistic regression analysis was then performed to evaluate potential risk for injury on the basis of these anatomic variables.
Compared with matched controls, patients with a ligamentous Lisfranc injury were found to have a significantly smaller ratio of second metatarsal length to foot length (p < 0.001) on weight-bearing radiographs.
Occurrence of a ligamentous Lisfranc injury was shown to be associated with a smaller ratio of second metatarsal length to foot length; >50% of patients in the injury group had a ratio of <29%.
Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.
[Show abstract][Hide abstract] ABSTRACT: To investigate efficacy of open reduction and internal fixation with the miniplate and hollow screw in the treatment of Lisfranc injury.
Ten cases of Lisfranc injury treated by open reduction, miniplate and hollow screw in our hospital were retrospectively analyzed. There were 6 males and 4 females with age ranging from 25 to 45 years (mean 32 years). Among them, one case was classified as Type A, six Type B and three Type C. Injury mechanism included road traffic accidents (3 cases), fall from height (5 cases) and hit by heavy object (2 cases). All injuries were closed without cerebral trauma or other complicated injuries. The time interval between injury and operation was 6-10 days (average 6.6 days). Postoperatively, the foot function was assessed using Visual Analogue Scales (VAS) and American Orthopaedic Foot and Ankle Society (AOFAS) Scales. Healing time and complications were observed.
All patients were followed up for 18-24 months (average 20 months). Anatomic reduction was achieved in all patients on images. There was statistical significance between preoperative score (7.89 ± 0.34) and score at postoperative 8 weeks (0.67 ± 0.13). According to the AOFAS score, 5 cases were defined as excellent, 3 cases as good and 2 cases as fair. During follow-up, there was no wound infection or complications except for osteoarthritis in 2 cases. Healing time ranged from 3 to 6 months with an average of 3.6 months.
Anatomical reduction of Lisfranc injury can be achieved by open reduction and internal fixation with the miniplate and hollow screw. Normal structure of Lisfranc joint is regained to a great extent; injured ligaments were also repaired. Therefore, this method offers excellent curative effect and can avoid postoperative complications and improve the patients' quality of life.
Chinese Journal of Traumatology (English Edition) 05/2015; 156(1). DOI:10.1016/j.cjtee.2014.08.002
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