PubMed · 6116008
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
1981-09-12. Problems with the shoulder.. https://pubmed.ncbi.nlm.nih.gov/6116008/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
STUDY DESIGN: In vitro biomechanical testing was performed on 12 cadaveric human lumbar spines. OBJECTIVE: To determine the initial dislocation resistance, as quantified by the pullout force of three different cage designs. SUMMARY OF BACKGROUND DATA: Interbody cage devices frequently are used as stand-alone cages in the surgical treatment of degenerative conditions in the lumbar spine. In contrast to the wide clinical acceptance of interbody fusion cages, there are only a few biomechanical studies of posterior pullout trials. METHODS: Cylindrical threaded cages (Ray TFC Surgical Dynamics), bullet-shaped cages (Stryker), and newly designed rectangular titanium cages with an endplate anchorage device (Marquardt) were used for posterior interbody implants. For each device, the pullout test was performed in four specimens on both sides (L3-L4). RESULTS: In the pullout test, the Stryker cages required a median pullout force of 130 N (minimum, 100 N; maximum, 220 N), as compared with the higher pullout force of the Marquardt cages (median, 605 N; minimum, 450 N; maximum, 680 N), and the Ray cages (median, 945 N; minimum, 125 N; maximum, 2230 N). CONCLUSIONS: Differences in pullout resistance were noted depending on the cage design. A cage design with threads or a hook device provides superior stability, as compared with ridges. The initial pullout resistance was highest for the Ray cages and lowest for the Stryker cages.
Explore the source record for details and available documents.
STUDY DESIGN: Determination of clinical results at least 2 years after lumbar spine surgery during which spinal stiffness measurements were made. OBJECTIVES: To determine whether spine stiffness is predictive of clinical results after lumbar spine surgery for spinal stenosis, disc herniation, or degenerative spondylolisthesis. SUMMARY OF BACKGROUND DATA: The implied clinical wisdom is that instability of the spine portends a poor prognosis for relief of back pain after surgery in the absence of a fusion. The possibility that an objective measure of lumbar spinal motion segment unit stiffness could aid the surgeon in predicting satisfaction with treatment was considered. METHODS: A total of 298 patients were measured intraoperatively with the spinal stiffness gauge to determine motion segment stiffness. Intraoperative spinal stiffness was analyzed to determine the influence of this measurement on clinical results. RESULTS: Statistical analysis revealed that stiffness measurements did not correlate with clinical results of surgery. Patients with loose motion segment units before decompression did not demonstrate a significantly different level of satisfaction with surgical results a minimum of 2 years after surgery, whether they were fused or not fused. Based on stiffness measurements, a diagnosis of herniated nucleus pulposus or degenerative spondylolisthesis was indicative of a more unstable spine than a diagnosis of spinal stenosis. CONCLUSIONS: Intraoperative spinal stiffness measurements did not predict clinical results after lumbar spine surgery.