Overtightening of the syndesmosis revisited and the effect of syndesmotic malreduction on ankle dorsiflexion |
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| Institution: | 1. Assistant Professor, AO Research Institute Davos, Davos, Switzerland;2. Assistant Professor, Department of Orthopaedics and Rehabilitation, University of Florida, Gainesville, FL;3. Senior Surgeon, Department of Trauma, Hand and Reconstructive Surgery, University Hospital Jena, Jena, Germany;4. Senior Surgeon, Gelenkzentrum Rhein- Main, Hochheim, Germany;5. Professor and Head of Department, Luzerner Kantonsspital, Centre for Orthopaedics and Trauma Surgery, Luzern, Schweiz;6. Professor and Leader, Biomedical Development Program, AO Research Institute Davos, Davos, Switzerland;7. Professor and Director, AO Research Institute Davos, Davos, Switzerland |
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| Abstract: | BackgroundAnkle syndesmotic injuries are a significant source of morbidity and require anatomic reduction to optimize outcomes. Although a previous study concluded that maximal dorsiflexion during syndesmotic fixation was not required, methodologic weaknesses existed and several studies have demonstrated improved ankle dorsiflexion after removal of syndesmotic screws.The purposes of the current investigation are: (1) To assess the effect of compressive syndesmotic screw fixation on ankle dorsiflexion utilizing a controlled load and instrumentation allowing for precise measurement of motion. (2) To assess the effect of anterior & posterior syndesmotic malreduction after compressive syndesmotic screw fixation on ankle dorsiflexion.Material and methodsFifteen lower limb cadaveric leg specimens were utilized for the study. Ankle dorsiflexion was measured utilizing a precise micro-sensor system after application of a consistent load in the (1) intact state, (2) after compression fixation with a syndesmotic screw and (3) after anterior & (4) posterior malreduction of the syndesmosis.ResultsFollowing screw compression of the nondisplaced syndesmosis, dorsiflexion ROM was 99.7 ± 0.87% (mean ± standard error) of baseline ankle ROM. Anterior and posterior malreduction of the syndesmosis resulted in dorsiflexion ROM that was 99.1 ± 1.75% and 98.6 ± 1.56% of baseline ankle ROM, respectively. One-way ANOVA was performed showing no statistical significance between groups (p-value = 0.88).Two-way ANOVA comparing the groups with respect to both the reduction condition (intact, anatomic reduction, anterior displacement, posterior displacement) and the displacement order (anterior first, posterior first) did not demonstrate a statistically significant effect (p-value = 0.99).ConclusionMaximal dorsiflexion of the ankle is not required prior to syndesmotic fixation as no loss of motion was seen with compressive fixation in our cadaver model. Anterior or posterior syndesmotic malreduction following syndesmotic screw fixation had no effect on ankle dorsiflexion. Poor patient outcomes after syndesmotic malreduction may be due to other factors and not loss of dorsiflexion motion.Level of Evidence: IV |
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| Keywords: | Ankle fracture Syndesmotic screw Syndesmotic overtightening Syndesmotic malreduction Cadaveric study Ankle ROM Biomechanical Study |
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