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J Neurosurg Spine. 2016 Jan;24(1):54-9. doi: 10.3171/2015.4.SPINE14948. Epub 2015 Sep 25.

Flexibility and fatigue evaluation of oblique as compared with anterior lumbar interbody cages with integrated endplate fixation.

Author information

1
Excelen Center for Bone and Joint Research, Minneapolis, Minnesota;
2
Midwest Spine Institute, Stillwater, Minnesota; and.
3
Pinnacle Orthopaedics, Marietta, Georgia.

Abstract

OBJECTIVE:

This study was undertaken to quantify the in vitro range of motion (ROM) of oblique as compared with anterior lumbar interbody devices, pullout resistance, and subsidence in fatigue.

METHODS:

Anterior and oblique cages with integrated plate fixation (IPF) were tested using lumbar motion segments. Flexibility tests were conducted on the intact segments, cage, cage + IPF, and cage + IPF + pedicle screws (6 anterior, 7 oblique). Pullout tests were then performed on the cage + IPF. Fatigue testing was conducted on the cage + IPF specimens for 30,000 cycles.

RESULTS:

No ROM differences were observed in any test group between anterior and oblique cage constructs. The greatest reduction in ROM was with supplemental pedicle screw fixation. Peak pullout forces were 637 ± 192 N and 651 ± 127 N for the anterior and oblique implants, respectively. The median cage subsidence was 0.8 mm and 1.4 mm for the anterior and oblique cages, respectively.

CONCLUSIONS:

Anterior and oblique cages similarly reduced ROM in flexibility testing, and the integrated fixation prevented device displacement. Subsidence was minimal during fatigue testing, most of which occurred in the first 2500 cycles.

KEYWORDS:

DEXA = dual-energy x-ray absorptiometry; IPF = integrated plate fixation; ROM = range of motion; fatigue; interbody cage; interbody device; lumbar spine biomechanics; pullout testing; subsidence

PMID:
26407089
DOI:
10.3171/2015.4.SPINE14948
[Indexed for MEDLINE]

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