使用聚乳酸扩张塞固定截骨术时，兔股骨远端在愈合过程中的抗剪强度。

Shear strength of a distal rabbit femur during consolidation of an osteotomy fixed with a polylactide expansion plug.

作者信息

Pihlajamäki H, Böstman O, Manninen M, Päivärinta U, Taurio R, Tamminmäki M, Törmälä P, Rokkanen P

机构信息

Department of Orthopaedics and Traumatology, University Central Hospital, Helsinki, Finland.

出版信息

Biomaterials. 1994 Mar;15(4):257-61. doi: 10.1016/0142-9612(94)90048-5.

DOI:10.1016/0142-9612(94)90048-5

PMID:8031984

Abstract

The consolidation of a transverse transcondylar osteotomy of the distal rabbit femur, fixed with a self-reinforced polylactide expansion plug, was studied radiographically and mechanically. The peak shear force was assessed by stressing the osteotomy site to failure. The intact contralateral femur of the same rabbit served as a control. Fifteen rabbits were tested in groups of five animals with follow-up times of 6, 12 or 24 wk after fixation of the osteotomy. The absorbable plug, measuring 4.5 mm in diameter and 30 mm in length, had an expandable distal locking blade system. Thirteen osteotomies showed a radiographically solid bony union. The mean shear strength of the specimens was 3.5 MPa at 6 wk, 3.5 MPa at 12 wk and 4.3 MPa at 24 wk. The mean shear strength of the control distal femora was 3.6 MPa. In conclusion, the fixation properties of the newly developed absorbable expansion plug were deemed satisfactory in this experimental fracture model.

摘要

研究了采用自增强聚丙交酯扩张塞固定的兔股骨远端横向髁上截骨术的骨愈合情况，并进行了影像学和力学分析。通过对截骨部位施加应力直至失效来评估峰值剪切力。同一只兔的完整对侧股骨作为对照。将15只兔分为5组进行测试，截骨固定后随访时间分别为6周、12周或24周。可吸收塞直径4.5毫米，长度30毫米，具有可扩张的远端锁定刀片系统。13例截骨术显示影像学上骨愈合良好。标本的平均剪切强度在6周时为3.5兆帕，12周时为3.5兆帕，24周时为4.3兆帕。对照股骨远端的平均剪切强度为3.6兆帕。总之，在该实验性骨折模型中，新开发的可吸收扩张塞的固定性能被认为是令人满意的。