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Syndesmotic screw placement: a biomechanical analysis
A McBryde1, B Chiasson, A Wilhelm
1Department of Orthopaedic Surgery, University of South Alabama, Mobile 36617, USA.
Foot & Ankle International
|May 1, 1997
Summary
Optimal syndesmotic screw placement is crucial for treating tibiofibular diastasis and Maisonneuve fractures. Studies suggest placing screws 2.0 cm above the tibiotalar joint minimizes syndesmotic widening and improves fixation stability.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Anatomy
Background:
- Syndesmotic screw fixation is indicated for tibiofibular diastasis, Maisonneuve fractures, and post-fixation instability of distal tibia-fibula fractures.
- Optimal screw placement is essential for effective syndesmotic stabilization.
Purpose of the Study:
- To determine the optimal level for syndesmotic screw placement prior to Maisonneuve fracture creation.
- To evaluate the biomechanical effects of different syndesmotic screw placement depths.
Main Methods:
- Cadaveric dissection and biomechanical testing of 17 embalmed legs.
- Syndesmotic fixation at 2.0 cm and 3.5 cm above the tibiotalar joint, compared to no fixation.
- Application of torsional load to quantify syndesmotic widening and failure under simulated fracture conditions.
Main Results:
- Fixation at 2.0 cm significantly reduced syndesmotic widening compared to no fixation (P = 0.04).
- Fixation at 2.0 cm showed a trend towards less syndesmotic widening than fixation at 3.5 cm (P = 0.07).
- Screw placement at 2.0 cm above the tibiotalar joint demonstrated superior stability.
Conclusions:
- Placing syndesmotic screws at 2.0 cm above the tibiotalar joint appears to be an optimal strategy.
- This placement minimizes instability and widening in simulated Maisonneuve fractures.
- Further research may validate this finding for clinical application in ankle fracture management.