Abstract
The load-sharing characteristics of threaded interbody cages before and after cyclic loading are poorly understood. In the current study, lumhar interbody cages were filled with epoxy, sectioned longitudinally, and pressure sensors were placed between halves of the cages to measure the distribution of loads between and within the cages. Human lumbar spine segments were instrumented anteriorly with bilateral cages and subjected to cyclic compression loads combined with flexion and extension moments. Sagittal plane motion between vertebrae on either side of the cages also was measured during application of cyclic compression and flexion loads. A small hut statistically significant asymmetry was found in the distribution of load between the left and right cages, and the extent of asymmetry varied during compression and flexion loading. With ligament tension only, 66% of the load was supported hy the posterior regions of the cages, whereas during peaks in the combined compression and flexion loading, only 33% of the load was supported by the posterior regions. The cages reduced intervertebral motion 78% during forward flexion, whereas extension resulted in a 100% increase in motion. Surgeons should recognize that bilateral cages may not share loads equally, and the results of this study suggest that early extension should he restricted after the placement of anterior lumbar interbody cages.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 174-179 |
| Number of pages | 6 |
| Journal | Clinical Orthopaedics and Related Research |
| Issue number | 408 |
| State | Published - Mar 1 2003 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Surgery
- Orthopedics and Sports Medicine
Cite this
Load sharing and kinematics of threaded cages for lumbar interbody fusion. / Lavoie, Stephane; Lindsey, Ronald; Gugala, Zbigniew; Kirking, Bryan; Hipp, John A.
In: Clinical Orthopaedics and Related Research, No. 408, 01.03.2003, p. 174-179.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Load sharing and kinematics of threaded cages for lumbar interbody fusion
AU - Lavoie, Stephane
AU - Lindsey, Ronald
AU - Gugala, Zbigniew
AU - Kirking, Bryan
AU - Hipp, John A.
PY - 2003/3/1
Y1 - 2003/3/1
N2 - The load-sharing characteristics of threaded interbody cages before and after cyclic loading are poorly understood. In the current study, lumhar interbody cages were filled with epoxy, sectioned longitudinally, and pressure sensors were placed between halves of the cages to measure the distribution of loads between and within the cages. Human lumbar spine segments were instrumented anteriorly with bilateral cages and subjected to cyclic compression loads combined with flexion and extension moments. Sagittal plane motion between vertebrae on either side of the cages also was measured during application of cyclic compression and flexion loads. A small hut statistically significant asymmetry was found in the distribution of load between the left and right cages, and the extent of asymmetry varied during compression and flexion loading. With ligament tension only, 66% of the load was supported hy the posterior regions of the cages, whereas during peaks in the combined compression and flexion loading, only 33% of the load was supported by the posterior regions. The cages reduced intervertebral motion 78% during forward flexion, whereas extension resulted in a 100% increase in motion. Surgeons should recognize that bilateral cages may not share loads equally, and the results of this study suggest that early extension should he restricted after the placement of anterior lumbar interbody cages.
AB - The load-sharing characteristics of threaded interbody cages before and after cyclic loading are poorly understood. In the current study, lumhar interbody cages were filled with epoxy, sectioned longitudinally, and pressure sensors were placed between halves of the cages to measure the distribution of loads between and within the cages. Human lumbar spine segments were instrumented anteriorly with bilateral cages and subjected to cyclic compression loads combined with flexion and extension moments. Sagittal plane motion between vertebrae on either side of the cages also was measured during application of cyclic compression and flexion loads. A small hut statistically significant asymmetry was found in the distribution of load between the left and right cages, and the extent of asymmetry varied during compression and flexion loading. With ligament tension only, 66% of the load was supported hy the posterior regions of the cages, whereas during peaks in the combined compression and flexion loading, only 33% of the load was supported by the posterior regions. The cages reduced intervertebral motion 78% during forward flexion, whereas extension resulted in a 100% increase in motion. Surgeons should recognize that bilateral cages may not share loads equally, and the results of this study suggest that early extension should he restricted after the placement of anterior lumbar interbody cages.
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UR - http://www.scopus.com/inward/citedby.url?scp=0037338598&partnerID=8YFLogxK
M3 - Article
C2 - 12616056
AN - SCOPUS:0037338598
SP - 174
EP - 179
JO - Clinical Orthopaedics and Related Research
JF - Clinical Orthopaedics and Related Research
SN - 0009-921X
IS - 408
ER -