The Effect of Pelvic Position on Spinal Rotation a Neutral Spine Analysis

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Virtue, Matthew Charles
ETD; Thoracic cage; Lordosis; Pelvic tilt; Digitization; Kinesiology; Legacy ETDs
thesis / dissertation description
Study Design: To determine if significant differences for active total trunk rotation are present in anterior, neutral and posterior pelvic tilt positions, three repeated measures analysis of variances (RM-ANOVA) were performed.Objective: To determine, from the seated posture, whether the anterior, neutral or posterior position of the spine and pelvis is associated with achieving active total trunk rotation.Background: Many researchers have assessed the movements of the spine, but little research has examined how various pelvic positions influences spinal mobility. Spinal rotation is necessary for functional activity and may be a contributing factor to the incidence of back pain.Methods and Measures: Reflective markers were placed on the acromion processes to track trunk rotation. Markers were also placed on the ASIS and PSIS to track pelvic tilt. Female participants performed the instructed movements in a seated position while being video recorded. All angular measurements were determined from digitized video data.Results: A significant difference was found for the amount of active total trunk rotation achieved in the neutral position when compared to an anterior or posterior pelvic tilt position (p < 0.05).Conclusions: These results suggest that pelvic position influences the amount of active total trunk rotation achieved in the seated position. Further research should examine male participants as well as trunk rotation while standing.