Three-Dimensional-Printed Osteotomy and Snap-Tooth Repositioning Guides for Corrective Osteotomy of Severe Lower-Limb Varus Deformity:A Case Report
Wu Bi
Fang Zhi
Lan Pingwen
Zhang Jianjun
Gao Bo
Chen Xi
Abstract：Objective To explore the application of 3D printed osteotomy and snap-tooth repositioning guides in corrective osteotomy for severe lower-limb varus deformity.Methods A 32-year-old man with bilateral lower-limb varus deformity for more than 20 years and progressive bilateral knee and ankle pain for 2 years was diagnosed with bilateral knee and ankle osteoarthritis.Pre-operative CT of the pelvis and entire lower limbs was performed to construct a 3D model.Femoral and tibial deformity angles were measured in the coronal,sagittal and transverse planes,and patient-specific osteotomy and snap-tooth repositioning guides were designed.Post-operative full-length anteroposterior radiographs of the lower limbs were obtained and mechanical lateral distal femoral angle,anatomical lateral distal femoral angle,medial proximal tibial angle,lateral distal tibial angle and hip-knee-ankle angle were measured to assess correction.The hospital speical surgery(HSS)is used to evaluate patients' knee joint function.Results Post-operative alignment of both lower limbs was markedly improved compared with pre-operative values.The HSS scores showed significant improvement at 3 and 6 months postoperatively compared to preoperative levels.By the 6-month mark,the deformities in the lower limbs' appearance had markedly improved,and the knee joint flexion-extension function had been fully restored.Conclusion For patients with multiplanar deformities of both lower limbs,3D-printed osteotomy and snap-tooth repositioning guides can achieve and maintain triplanar correction,facilitate internal fixation,reduce intra-operative fluoroscopy and yield satisfactory post-operative limb alignment.
Keywords：3D printingrepositioning guidelower-limb varus deformitycorrective osteotomy
Publication Date：2025-10-25
Online Publishing Date：2025-11-11(First online date of this platform, not the publication date of the document)
Pages：5( 932-936 )