Sacroiliac joint manipulation was performed in lateral decubitis position.

The control group did not undergo any treatment.

Sacroiliac manipulation was performed using manual treatment method by lying patients on their sides. First, the patient was positioned firmly on the edge of the examination table, while the restricted sacroiliac joint remains on the upper side. Then, the physician's hand was positioned on the patient's hip, and the flexion was made on the lumbar spine with the movement from the hip to the upper thigh, and the impulse given by the HVLA technique was applied in the anteroinferior direction to the iliac crest and trochanter major.

Biodex Balance System (Biodex, Inc, Shirley, New York) (BDS) device was used to measure postural balance. It can extract anterior-posterior stability index (APSI), mediolateral stability index (MLSI) and overall stability index (OSI) for the measurement of standing posture control. Lower oscillation scores indicate better postural stability (Sung and Kim, 2018). The bipedal balance tests were performed with eyes open and closed and the volunteers were measured with their hands at their sides. The tests were performed for 30 seconds.

Muscle strength measurements were performed with microFET ®2, a digital handheld dynamometer. The measurement is based on the compression principle and has high reliability and measurement accuracy. The results were recorded in kilograms of force (kgf) and measurements were taken from the quadriceps femoris and hamstring muscles.

Range of motion (ROM) measurements were performed with a universal goniometer. Degree was used as the unit of measurement. Flexion, extension, internal rotation, external rotation, abduction and adduction angles were measured bilaterally for the hip joint. Flexion, extension and lateral flexion (left-right) were measured in the lumbar region. For these values, the values determined by the American Association of Orthopedic Surgeons were taken as a basis, recorded during the measurement and proceeded in order.