HOLE PREPARATION TECHNIQUES FOR TRANSPEDICLE SCREWS - EFFECT ON PULL-OUT STRENGTH FROM HUMAN CADAVERIC VERTEBRAE

被引：8

作者：

GEORGE, DC ^{[1
]}

KRAG, MH ^{[1
]}

JOHNSON, CC ^{[1
]}

VANHAL, ME ^{[1
]}

HAUGH, LD ^{[1
]}

GROBLER, LJ ^{[1
]}

机构：

[1] UNIV VERMONT,COLL MED,DEPT ORTHOPAED & REHABIL,MCCLURE MUSCULOSKELETAL RES CTR,BURLINGTON,VT 05405

来源：

SPINE | 1991年 / 16卷 / 02期

关键词：

D O I：

10.1097/00007632-199102000-00015

中图分类号：

R74 [神经病学与精神病学];

学科分类号：

摘要：

In each of eight thoracolumbar human cadaveric vertebrae, a hole was made through one pedicle into the vertebral body with a drill bit and through the contralateral pedicle with a probe. Identical metal screws were implanted into the holes to equal depths, and maximum pull-out force was determined for each screw. Using a paired Student t test, no significant difference (P = 0.87) was found in pull-out strength between the screws implanted into drilled holes and those implanted into probed holes. In fact, the average pull-out strengths for the two groups differed by less than 2%. The pedicular cortex was broken through during hole preparation in 5 of the 16 pedicles: 3 as a result of drilling and 2 secondary to probing. The average pull-out strength of the screws in these five pedicles was 11.0% less than the average pull-out strength of the screws implanted into the contralateral intact pedicles. Although this does not represent a statistically significant difference (P = 0.15), it suggests that damaging the pedicular cortex may weaken pedicle screw fixation.

引用

页码：181 / 184

页数：4