MECHANICS OF RETROGRADE NAIL VERSUS PLATE FIXATION FOR SUPRACONDYLAR FEMUR FRACTURES

被引：86

作者：

FIROOZBAKHSH, K ^{[1
]}

BEHZADI, K ^{[1
]}

DECOSTER, TA ^{[1
]}

MONEIM, MS ^{[1
]}

NARAGHI, FF ^{[1
]}

机构：

[1] UNIV NEW MEXICO,SCH MED,DEPT ORTHOPAED & REHABIL,ALBUQUERQUE,NM 87131

来源：

JOURNAL OF ORTHOPAEDIC TRAUMA | 1995年 / 9卷 / 02期

关键词：

SUPRACONDYLAR FEMUR FRACTURES; INTERNAL FIXATION; MECHANICAL TESTING; RIGIDITY;

D O I：

10.1097/00005131-199504000-00011

中图分类号：

R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学（修复外科学）];

学科分类号：

摘要：

Two common types of internal fixations for the supracondylar femur fractures-the retrograde intramedullary nail and the 95 degrees sideplate and screw-were mechanically tested in synthetic composite femur bones to determine the quantitative differences in their inherent rigidity. The medial and lateral femoral condyles were separated by a sagittal osteotomy, and a standardized medial segmental shaft defect was created at the distal shaft. The osteotomized specimens were stabilized using one of the two implants and were tested in different modes of loading. The bending stiffness of both constructs were not significantly different in varus compression, medial bending (pure varus), and bending in flexion. The plate and screw implant was three times stiffer in lateral bending (pure valgus) and 1.2 times stiffer in valgus compression than the retrograde supracondylar nail (p < 0.01). The torsional stiffness of the plate and screw implant was significantly higher, 1.6 times that of the nail. Clinically, the most important and common cause of implant failure is varus loadings due to loss of medial cortical contact. Although the retrograde nail was less rigid in other physiologically less critical modes of loading, it had a rigidity comparable to that of the plate in varus loading. Therefore, a supracondylar nail may be considered a mechanically possible alternative to plate fixation.

引用

页码：152 / 157

页数：6

共 26 条

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