Muscle Function and Pelvic Stability While Walking in Patients With Symptomatic Lumbar Spinal Stenosis

Inclusion Criteria patients: * Diagnosed symptomatic lumbar spinal stenosis * Availability of lumbar MR images * Scheduled for decompressive surgery at the University Hospital Basel Exclusion Criteria patients: * Prior decompressive surgery * Body Mass Index (BMI) ≥ 35 kg/m2 * Additional pathologies that influence the mobility of the pelvis * Use of walking aids * Inability to provide informed consent Exclusion Criteria healthy control subjects: * BMI ≥ 35 kg/m2 * Pain in the lower extremity or lower back in the previous 6 months * Prior surgery of the lumbo-pelvic-hip complex * History of claudications * Neurological or orthopaedic conditions that may influence gait * Inability to provide informed consent