Rationale: The sacroiliac joint (SIJ) is increasingly being recognized as a potential cause of chronic low back and buttock pain. The SIJ is affected in 14-22% in patients presenting with this pain. Conservative treatment options include oral analgesic use, physical therapy, radiofrequency denervation and intraarticular steroid injections. When non-surgical treatment remains ineffective, surgical intervention is a reasonable option in the form of minimally invasive sacroiliac joint fusion (MISJF). Recent literature suggests that imbalance and sagittal sacropelvic morphology can occur in patients with SIJ dysfunction. Using motion analyses, the investigators want to evaluate full movement patterns in SIJ patients. Potentially, changes in these parameters can be observed before and after MISJF surgery. Objective: To determine spatiotemporal parameters, pelvic obliquity, center of gravity and load capacity in patients suffering from SIJ dysfunction before and after MISJF surgery. Movement parameters will also be determined in healthy individuals to compare with patients suffering from SIJ dysfunction. Methods: This prospective cohort study will include patients enlisted for MISJF surgery because of SIJ dysfunction. Spatiotemporal parameters, pelvic obliquity, center of gravity and load capacity will be examined before and 3 months after surgery in a professional Motion Lab. Movement parameter of healthy individuals will also be evaluated at the Motion Lab. All data will be analyzed using MATLAB software.
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Change in pelvic obliquity during one leg stance will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in pelvic tilt during one leg stance will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in pelvic obliquity during sit-to-stand task will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in pelvic tilt during sit-to-stand task will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in cadence during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in stride length during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in step width during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in percentage of swing phase during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in percentage of single support phase during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in percentage of double support phase during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in center of gravity during gait will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in center of gravity during one leg stance will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery
Change in center of gravity during sit-to-stand tasks will be collected using VICON Nexus systems.
Timeframe: Before and 3 months after surgery