Clinical Spine Surgery

Skip Navigation LinksHome > September 1990 - Volume 3 - Issue 3 > The Strength of a Posterior Element Claw at One versus Two S...
Journal of Spinal Disorders:

The Strength of a Posterior Element Claw at One versus Two Spinal Levels.

Roach, James W.; Ashman, Richard B.; Allard, Randy N.

Collapse Box


Summary: In the Cotrel-Dubousset and Texas Scottish Rite Hospital spinal implants systems, the upper hook on the convex rod is usually clawed to prevent posterior pull out. A transverse process hook and an upwardly directed pedicle hook are usually inserted on the same lamina level. However, clawing two levels instead of one is a simpler surgical procedure. We biomechanically compared the posterior pull-out strength of a one-level versus two-level construct. The average load of failure of the double-level construct was significantly greater (p <0.05) as compared with the single level. Thus, the two-level construct is not only easier to insert, it is also stronger.

(C) Lippincott-Raven Publishers.

Follow Us!



Article Tools


Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.