Objective The main aim of this study was to determine the effective magnitude of proximal tibial segment medialization achievable during tibial plateau levelling and medialization osteotomy (TPLO-M) with Fixin 1.9-2.5 mm pre-contoured T plates with three different offsets.

Methods In this in vitro study, 36 tibia bone models reconstructed using stereolithography from hindlimb CT scans of a 5 kg dog and a 10 kg dog without orthopaedic disease were used. TPLO-M was performed using plates with three different offsets (2, 4 and 6 mm). Post-osteotomy radiographic and bone models measurements were performed.

Results Regardless of patient weight, the +4 mm offset plates provided a translation of 2.93mm (± 0.51) while the +6 mm offset plates provided a translation of 5.03mm (± 0.47). In the 5kg dog bone model group limited bone contact at the osteotomy site was documented when using the +6mm offset plate.

Conclusion The +4mm and +6mm offset Fixin plates may be considered for TPLO-M in dogs weighing between 5 and 10 kg. The +6mm offset plate should be used cautiously in dogs weighing less than 10 kg since this plate may result in insufficient postoperative bone apposition at the osteotomy site.

目的 本研究的主要目的是确定使用具有三种不同偏移量的 Fixin 1.9-2.5 mm 预轮廓 T 板进行胫骨平台调平和内侧化截骨术 (TPLO-M) 期间可实现的近端胫骨段内侧化的有效大小。

方法 在这项体外研究中，使用了 36 个胫骨模型，这些模型是根据一只 5 公斤重的狗和一只没有骨科疾病的 10 公斤重的狗的后肢 CT 扫描立体光刻重建的。TPLO-M 使用具有三种不同偏移量（2、4 和 6 毫米）的板进行。进行截骨术后放射线照相和骨模型测量。

结果 无论患者体重如何，+4 mm 偏移板提供 2.93mm (± 0.51) 的平移，而 +6 mm 偏移板提供 5.03mm (± 0.47) 的平移。在 5kg 狗骨模型组中，使用 +6mm 偏置板时记录了截骨部位的有限骨接触。

结论 +4mm 和 +6mm 偏移 Fixin 板可考虑用于体重在 5 至 10 kg 之间的狗的 TPLO-M。对于体重小于 10 公斤的狗，应谨慎使用 +6mm 偏置板，因为该板可能会导致术后截骨部位骨附着不足。