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[Experimental cadaveric study assesing protection and osteotomy guide system (BARU) in hallux valgus surgery using Reverdin-Isham technic].

INTRODUCTION: Hallux valgus is a high frequency disorder, affecting the first ray. Operative correction techniques have grown popularity lately. One of them is the Reverdin-Isham technique (first metatarsal medial incomplete osteotomy). Recently, a protection and osteotomy cutting guide has been developed: the BARU system.

OBJECTIVE: To test the usefulness of the BARU system as a protective factor for soft structures adjacent to the surgical site and guidance for osteotomy.

MATERIAL AND METHODS: Experimental cadaveric study. Six cadaveric feet (two fresh-frozen and four in formaldehyde solution), unapproached. Feet were numbered and intervened with RI technique, three of them with BARU system and three without it. Afterwards, dissection by two dissectors who did not know whether the BARU system had been used or not, establishing a single-blinded model. 13 structures were evaluated in each foot. Data was recovered into Microsoft Office Excel and processed with SPSS. 2 test (significative if p value < 0.05) and relative risk were calculated.

RESULTS: Approach using BARU system was satisfactory, with usual-size operation-ports. BARU system colocation was simple and radiological control showed adequate spatial location. The device contributed as reference for cutting direction and depth. 65 out of the 78 searched structures were found (83.3%). Six injuries were found among the assessed structures: plantar medial nerve (one injury), plantar medial artery (one injury), flexor brevis muscle (three injuries), abductor muscle (one injury). Five of these injuries occurred in non-utilizing BARU system feet.

CONCLUSION: Promising results in terms of protection of nearby structures, cutting guide, and ease of intervention. Avoids X-rays exposure. Not significant statistical calculations, the sample should be enlarged.

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