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Location of Vertical Limb of Extensile Lateral Calcaneal Approach and Risk of Injury of the Calcaneal Branch of Peroneal Artery.
Foot & Ankle International 2019 Februrary
BACKGROUND:: The extensile lateral calcaneal approach is a standard method for accessing a joint depression calcaneal fracture. However, the operative wound complication rate is high. Previous studies showed a calcaneal branch of the peroneal artery contributing to the calcaneal flap blood supply. This study focuses on the location of the vertical limb in this approach correlating to the aforementioned artery and flap perfusion.
METHODS:: Ten pairs of fresh-frozen cadaveric lower extremities were used. Extensile lateral calcaneal approach (ELCA) was carried out on both calcanei, where the vertical limb was placed at the line between the posterior border of lateral malleolus and lateral edge of the Achilles tendon for the right side (standard ELCA; sELCA) and at the lateral edge of the Achilles tendon for the left side (modified ELCA; mELCA). The identified vessel in the vertical limb incision was ligated and cut, and the horizontal limb of the incision was carried out as usual. After completion of flap elevation, 80°C water was injected into the popliteal vessel. In addition, thermal images were taken pre- and postinjection. Dye was injected subsequently, and perfusion was recorded in video format.
RESULTS:: Mean pre- and postinjection skin flap temperature difference was significantly higher in mELCA (5.36°C vs 0.72°C, P = .0002). Dye perfusion patterns were significantly better in mELCA ( P = .0013). The calcaneal branch of peroneal artery was found in the vertical incision in 9 of 10 sELCA, with average distance 22.04 mm anterior to the calcaneal tuberosity and 8.22 mm proximal to superior border of the calcaneus, whereas one was found in mELCA, in which perfusion tests still appeared normal.
CONCLUSION:: The vertical limb of incision during extensile lateral calcaneal approach should be placed at the lateral edge of the Achilles tendon to avoid injuring the calcaneal branch of peroneal artery, which supplies the lateral calcaneal flap. However, further clinical research might be needed to confirm the results of this study.
CLINICAL RELEVANCE:: This study demonstrates a likely safest position for the proper incision for exposing the lateral calcaneus.
METHODS:: Ten pairs of fresh-frozen cadaveric lower extremities were used. Extensile lateral calcaneal approach (ELCA) was carried out on both calcanei, where the vertical limb was placed at the line between the posterior border of lateral malleolus and lateral edge of the Achilles tendon for the right side (standard ELCA; sELCA) and at the lateral edge of the Achilles tendon for the left side (modified ELCA; mELCA). The identified vessel in the vertical limb incision was ligated and cut, and the horizontal limb of the incision was carried out as usual. After completion of flap elevation, 80°C water was injected into the popliteal vessel. In addition, thermal images were taken pre- and postinjection. Dye was injected subsequently, and perfusion was recorded in video format.
RESULTS:: Mean pre- and postinjection skin flap temperature difference was significantly higher in mELCA (5.36°C vs 0.72°C, P = .0002). Dye perfusion patterns were significantly better in mELCA ( P = .0013). The calcaneal branch of peroneal artery was found in the vertical incision in 9 of 10 sELCA, with average distance 22.04 mm anterior to the calcaneal tuberosity and 8.22 mm proximal to superior border of the calcaneus, whereas one was found in mELCA, in which perfusion tests still appeared normal.
CONCLUSION:: The vertical limb of incision during extensile lateral calcaneal approach should be placed at the lateral edge of the Achilles tendon to avoid injuring the calcaneal branch of peroneal artery, which supplies the lateral calcaneal flap. However, further clinical research might be needed to confirm the results of this study.
CLINICAL RELEVANCE:: This study demonstrates a likely safest position for the proper incision for exposing the lateral calcaneus.
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