Comparison of Vertical Ground Reaction Force during Walking in Patients with Sacroiliac Joint Pain and Healthy People

Introduction: Vast majority of the muscular disorders are known to be related to Sacroiliac joint. Due to the main role played by Sacroiliac joint, the current study was conducted to examine the effect of the pain among the people suffering from Sacroiliac joint pain on the vertical ground reaction force parameter. Materials and Methods : This case control study was carried out on 19 participants with Sacroiliac joint pain, VAS 3-5 and average age of 27±5.7, and 19 subjects with normal health conditions and average age of 29±7.6. The relevant data were collected while the participants were asked to walk at their desired speed over the force plate located on their way. Later on, all the parameters of vertical ground reaction force in the stance phase were recorded. At the end, data collected were compared by independent T-test in SPSS. Results: The results of the study revealed that participants distributed in control (healthy individuals) and experimental (individuals with Sacroiliac joint pain) groups were significantly different regarding the parameters of time and speed required to reach the stage of weight transition to the heel. Discussion: Considering the findings, it can be concluded that some compensatory strategies were adopted by the individuals with Sacroiliac joint- related problems in order to decrease the force that body experienced during walking. Key words: Force Plate, Sacroiliac Joint, Vertical Ground Reaction Force