Spine
-
Randomized Controlled Trial Comparative Study
Predictors and modifiers of treatment effect influencing sick leave in subacute low back pain patients.
Modifying effects in multivariate analyses of a randomized controlled trial. ⋯ The spine clinic intervention seems to have a main effect on work absenteeism via interacting with the concerns of being unable to work.
-
Comparative Study
Effects of charité artificial disc on the implanted and adjacent spinal segments mechanics using a hybrid testing protocol.
Finite element model of L3-S1 segment and confirmatory cadaveric testing were used to investigate the biomechanical effects of a mobile core type artificial disc (Charité artificial disc; DePuy Spine, Raynham, MA) on the lumbar spine. ⋯ The hybrid testing protocol is advocated because it better reproduces clinical observations in terms of motion following surgery, using pure moments. Using this approach, we found that the Charité artificial disc placement slightly increases motion at the implanted level, with a resultant increase in facet loading when compared to the adjacent segments, while the motions and loads decrease at the adjacent levels. However, in the load control mode that we believe is not that clinically relevant, there was a large increase in motion and a corresponding increase in facet loads, as compared to the intact.
-
Comparative Study
Effects of degeneration on the biphasic material properties of human nucleus pulposus in confined compression.
The biphasic compressive material properties of normal and degenerate human nucleus pulposus tissue were measured in confined compression. ⋯ Swelling is the primary load-bearing mechanism in both nondegenerate and degenerate nucleus pulposus. Knowledge of the biphasic material properties of the nucleus pulposus will aid the development of new treatment strategies for disc degeneration aimed at restoring mechanical function of the intervertebral disc.
-
A retrospective review of spine, chest, and pelvic dimensions of normal CT scans from 1999 to 2004 was performed. ⋯ Pelvic inlet width is an age-independent predictor of pediatric chest width and thoracic dimensions that may be used to assess thoracic and spine growth in early onset spine deformity patients.