Fixation of patella transverse fracture with absorbable materials: A biomechanical comparison with mental implant
10.3969/j.issn.1673-8225.2009.51.013
- VernacularTitle:可吸收内固定材料植入髌骨横断性骨折局部:与金属植入物生物力学性能的比较
- Author:
Jinlong ZHENG
;
Yijin WANG
;
Aimin CHEN
;
Lifeng LIU
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2009;13(51):10069-10073
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Absorbable materials for internal fixation have some advantages such as simple surgery, rapid recovery and no need to second surgery, and have been accepted in the circle of orthopaedics, and had been applied in the clinic. However, the system experiment evidences are not reliable.OBJECTIVE: To investigate whether the absorbable material (the absorbable tension band, absorbable stick or screw) is an acceptable alternative to stainless steel wire with Kirschner wire by comparing their biomechanical properties in the fixation of patella transverse fractures.DESIGN, TIME AND SETTING: The randomized controlled study of biomechanical analysis was performed at the Laboratory of Institute of Biomechanics, Shanghai University from March 2007 to January 2008.MATERIALS: Eight fresh patellae specimens were collected, with the complete patella, articular capsule and patellar ligament (3.0-4.0 cm) and quadriceps femoris (4.0-5.0 cm), and then divided into two groups at random, AO steel wire group (n = 2) and absorbable tension band group (n = 6).METHODS: Eight fresh patellae specimens were divided into two groups at random, AO steel wire group (n = 2) and absorbable tension band group (n = 6) to create models of transverse fractures, which were separately fixed by absorbable tension band,steel wire tension band + Kirschner wire to measure their biomechanics function. If fracture gap reached 1.0 mm, the fixation failed.MAIN OUTCOME MEASURES: The changes in patellar ligament tensile force, quadriceps femoris tensile force, patellar displacement, quadriceps femoris displacement, patellar ligament displacement and patella tensile strain were measured under external load.RESULTS: Under external load, no significant difference was determined in total displacement between the absorbable tension band group and AO steel wire group (9%-10% difference). No significant difference was detected in patellar strain between absorbable tension band group and AO steel wire group (9%-10% difference). The patellofemoral joint force was similar between the absorbable tension band group and AO steel wire group. When internal fixation displaced 1 mm, the load was 587 N in the absorbable tension band group, and 650 N in the AO steel wire group (P > 0.05).CONCLUSION: The absorbable material is an acceptable alternative to stainless steel wire with Kirschner wire in the fixation of patella transverse fractures, with the advantages of good biological function and good stability at the broken ends of fractured bone.
