WEIGHT BEARING X-RAYS FOR LISFRANC JOINT INJURY INSTABILITY & FRACTURE
- Early diagnosis of Lisfranc instability is crucial to prevent premature OA in the mid foot.
- Subtle instability patterns can be very difficult to identify on xrays.
- Plain radiographs may not effectively identify instability at the LisFranc Joint, especially on non-weight-bearing views.
- Weight-bearing x-rays are important as they reveal subtle differences between injured and uninjured sides.
- However, weight bearing may not be possible in the acute phase due to pain
Lisfranc instability on weight bearing x-rays can be assessed by examining:
- The lateral displacement of the second metatarsal in relation to the intermediate cuneiform on weight bearing radiographs C2M2 alignment. Step off more than 3mm.
- The distance between the medial cuneiform and the base of the second metatarsal on weight bearing radiographs C1M2 distance. Distance more than 2.1mm.
- Comparison views of the contralateral foot are also very useful.
- Do both non weight bearing and weight bearing.
- Subtle instability and widening can be easier to recognize when there is a direct comparison with normal.
- Weight-bearing radiographs provide greater reliability in diagnosing Lisfranc instability compared to non-weight-bearing views.
- Early diagnosis is important to prevent premature OA developing in the mid foot
Learn more about this condition & How best to report it in more detail in
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