Planning and correcting long bone deformities on the basis of using the models of 3D printing (A preliminary report)

Aims. The purpose of this study was to analyze the initial experience with adolescents treated for long-bone deformities of the lower extremities of different etiologies using osteotomies and fixation by interlocking nails.Materials and methods. We analyzed the accuracy of long-bone deformity correction using referent lines and angles, the time of consolidation, number of complications, and functional result.Results. We found that the accuracy of femur deformity correction (dependent on the complicity of the deformity), as estimated by different parameters, varied from 77.8% to 91.7%. Simple deformities and deformities of moderate complicity had the most accurate correction; the group of complex multiplanar deformities of the femur had the least accurate correction. This group included five cases of residual deformity, in which three of these had an angle of residual deformity <10°. The accuracy of leg deformity correction was 90%. Evaluation of the functional results using the Lower Extremity Functional Scale indicated the high functionality of the method used.Conclusions. Correction of long-bone deformities using intramedullary osteosynthesis by interlocking nails is an effective treatment of all types of femur and lower leg deformities. When treating complex deformities of the femur, the path to operative treatment should be complex and in most cases the nailing should be accompanied by intraoperative external fixation frame assistance.

Download Full-text

3D Printing Guide Plate for Accurate Hemicortical Bone Resection in Low-Grade Bone Sarcoma

10.21203/rs.3.rs-80945/v1 ◽

2020 ◽

Author(s):

Hongwei Wu ◽

Xian'an Li ◽

Shuo Yang ◽

Jie Bu ◽

Xuezheng Xu ◽

...

Keyword(s):

3D Printing ◽

Bone Sarcoma ◽

Long Bone ◽

Low Grade ◽

Joint Function ◽

Bone Resection ◽

Musculoskeletal Tumor ◽

Musculoskeletal Tumor Society ◽

Guide Plate ◽

Post Operation

Abstract Background: Surgical resection and reconstruction for low grade bone sarcoma in the metaphysis of the long bone remains challenging. We hypothesize that 3D printing osteotomy guide plate could assist to accurately resect the tumor lesion and save the joint function without higher recurrence rate. Methods: From January 2017 to August 2019, ten patients with low-grade malignant bone tumor in metaphysis of the limbs were treated with hemicortical resection using 3D printing guide plate and biological reconstruction. Results: Four patients were paracorticular osteosarcoma, five cases had highly differentiated chondrosarcoma, and one case was a chondromyxoid fibroma. Two of the cases involved the proximal humerus, while eight cases involved the distal femur. There was neither post-operation infection, internal fixation loosening, nor fracture occurrence in any of the patients. The Musculoskeletal Tumor Society score averaged at 27.1, while the International Society of Limb Salvage imaging score examination averaged 87.8%. Conclusions: Here, we demonstrate that the 3D printing osteotomy guide plate assisted hemicortical bone resection is a beneficial strategy to effectively resect the primary low-grade malignant bone tumors in the metaphysis of long bone and restore excellent joint function.

Download Full-text