STUDY DESIGN: Posture and motion analysis after a Cotrel-Dubousset instrumentation. OBJECTIVES: To investigate the compensation role of pelvis. SUMMARY OF BACKGROUND DATA: Few existing studies found no compensation at the lower unfused level but did not investigate the pelvis. METHODS: Thirty patients were analyzed before surgery then at short-, medium-, and long-term postoperative follow-up. Calibrated x-rays with three-dimensional reconstruction yielded quantification of pelvic parameters. Noninvasive optoelectronic system allowed analyzing subjects first in standing position, then during flexion-extension, lateral bending, and axial rotation. Skin markers were used to quantify three-dimensional orientation of the shoulders, trunk and pelvis, and their range of motion (ROM). RESULTS: Ten patients among 21 had after surgery more than 5 degrees change of pelvic incidence. In flexion, global ROM decreased from preoperative to postoperative phase (P < 0.05). Global ROM variation was not correlated to that of lower unfused segment, while it was highly correlated to pelvic ROM variation (r = 0.78 at medium follow-up). CONCLUSION: This study underlines the central role of pelvis in balance and motion of the patients before and after surgery.
STUDY DESIGN: Posture and motion analysis after a Cotrel-Dubousset instrumentation. OBJECTIVES: To investigate the compensation role of pelvis. SUMMARY OF BACKGROUND DATA: Few existing studies found no compensation at the lower unfused level but did not investigate the pelvis. METHODS: Thirty patients were analyzed before surgery then at short-, medium-, and long-term postoperative follow-up. Calibrated x-rays with three-dimensional reconstruction yielded quantification of pelvic parameters. Noninvasive optoelectronic system allowed analyzing subjects first in standing position, then during flexion-extension, lateral bending, and axial rotation. Skin markers were used to quantify three-dimensional orientation of the shoulders, trunk and pelvis, and their range of motion (ROM). RESULTS: Ten patients among 21 had after surgery more than 5 degrees change of pelvic incidence. In flexion, global ROM decreased from preoperative to postoperative phase (P < 0.05). Global ROM variation was not correlated to that of lower unfused segment, while it was highly correlated to pelvic ROM variation (r = 0.78 at medium follow-up). CONCLUSION: This study underlines the central role of pelvis in balance and motion of the patients before and after surgery.
Authors: Raphaël Dumas; Bertrand Blanchard; Robert Carlier; Christian Garreau de Loubresse; Jean-Charles Le Huec; Catherine Marty; Maryse Moinard; Jean-Marc Vital Journal: Med Biol Eng Comput Date: 2007-09-14 Impact factor: 2.602
Authors: Per D Trobisch; Amer F Samdani; Randal R Betz; Tracey Bastrom; Joshua M Pahys; Patrick J Cahill Journal: Eur Spine J Date: 2013-04-09 Impact factor: 3.134