Chronic lower back pain is a significant cause of disability, affecting 21-68% of people 60 years of age and older (source). Of these cases, 15-30% are attributed to posterior sacroiliac joint complex (PSIJC) pain (source), making it a target for treatment. Peripheral Nerve Stimulation (PNS) is a procedure that involves the placement of a lead under the skin with local anesthetic and electrically stimulating designated spinal nerves that deliver pain signals to the brain. It has emerged as a promising alternative to drug, injection, and radioablative therapies. Its use has been supported by previous studies of subjects who received permanent neurostimulation and experienced benefits such as decreased sensation of pain and perceived level of disability. SPRINT is a minimally invasive PNS system of interest due to its ability to provide long-term pain relief after temporary administration of PNS. The aim of this study is to understand whether the FDA-cleared SPRINT PNS system is safe and effective for the treatment of chronic PSIJC pain. This prospective clinical study will assess 10 subjects that meet the inclusion and exclusion criteria across 5 separate time points- 1.) Screening; 2.) Procedure within 3 months of screening; 3.) 12-day post-procedure follow-up; 4.) 3-month post-procedure follow-up; 5.) 3-Month post lead removal follow-up. The subjects will be required to complete physical examinations, and VAS and ODI questionnaires at timepoints 3, 4, and 5.