THE STRENGTH AND STIFFNESS OF THORACIC IMPLANT ANCHORS IN OSTEOPOROTIC SPINES

被引：21

作者：

BUTLER, TE ^{[1
]}

ASHER, MA ^{[1
]}

JAYARAMAN, G ^{[1
]}

NUNLEY, PD ^{[1
]}

ROBINSON, RG ^{[1
]}

机构：

[1] UNIV KANSAS,MED CTR,ORTHOPED SURG SECT,KANSAS CITY,KS 66160

来源：

SPINE | 1994年 / 19卷 / 17期

关键词：

BIOMECHANICS; OSTEOPOROSIS; SPINAL IMPLANTS; THORACIC SPINE;

D O I：

10.1097/00007632-199409000-00016

中图分类号：

R74 [神经病学与精神病学];

学科分类号：

摘要：

Objective. To gain a better understanding of factors affecting dorsal implant pull-out strength and stiffness so thoracic spinal implant fixation can be improved. Methods. Posterior pull-out testing of six thoracic implant anchor types was performed on 54 osteoporotic human vertebra, T2-10, with an average bone mineral density of 0.67 g/cm(2). Results. The mean loads at neural arch failure were similar (296 to 382 N). Pedicle strength was greatest at T2 and least at T3. Hook claws were stiffer than sublaminar wires (121 N/mm and 180 N/mm versus 42 N/mm and 52 N/mm, respectively). Facet hook and pedicle hook claws were comparable, as were subpars wires. Bone mineral density of the vertebral bodies correlated with the stiffness of the sublaminar wire anchors only. Conclusion. To optimize the strength and stiffness of implant constructs designed to resist forward flexion, this study supports using hook-claws rather than sublaminar wires and extension of fixation to T2 when clinically realistic.

引用

页码：1956 / 1962

页数：7

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