This subproject is one of many research subprojects utilizing theresources provided by a Center grant funded by NIH/NCRR. The subproject andinvestigator (PI) may have received primary funding from another NIH source,and thus could be represented in other CRISP entries. The institution listed isfor the Center, which is not necessarily the institution for the investigator.Hi-Res MRI of Paraspinal Muscles Before and After Posterolateral Fusion of Vertebral BodiesPosterior spinal fusion techniques through a midline approach are effective but result in significant muscle damage from paraspinal muscle stripping and elevated intramuscular pressure from retractors. Recent studies have shown a minimally invasive expanding retractor inserted through a paramedian approach generates significantly less retraction pressure than an open retractor inserted through a midline approach. The purpose of this multi-center study is to quantify paraspinal muscle damage and evaluate clinical outcome of minimally invasive (MIS) versus open posterolateral fusion. and retraction pressure studies.
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