Clinical Trial of the MiniStim PNS for Knee Pain- "FLEX" Study

Inclusion Criteria: A. Capable of giving informed consent and willing to follow all study related procedures; B. Women and men \>18 years of age; C. Baseline VAS score of \> 5; D. History of chronic, function-limiting knee pain of at least three months; E. Not had recent surgical procedures of the knee within the last three months; F. ≥50% temporary relief from temporary nerve diagnostics; G. No evidence of anatomic abnormalities that could jeopardize the placement of the device; H. Able to operate programmer, recharger, study assessments and provide accurate responses; I. Appropriate candidate for the implant procedure based on the opinion of investigator. Exclusion Criteria: A. An active implantable electronic device regardless of whether stimulation is ON or OFF; B. Dependency on utilizing wearable or transcutaneous monitoring device (hearing aids, continuous glucose monitors, etc.); C. Pregnant as confirmed by a urine pregnancy test or plan to become pregnant during study; D. Subject noted no relief from temporary nerve diagnostics; E. Inability to achieve appropriate positioning; F. Inability to understand informed consent and protocol; G. Conditions requiring recurring MRI evaluation or diathermy procedures; H. Anatomical restrictions such that device placement is not possible; I. Have a life expectancy of less than 1-year; J. Worker's compensation claimants; K. Based on opinion of investigator any legal concerns that would preclude his/her enrollment in the study or potentially confound results; L. Deemed unsuitable for enrollment by investigator based on medical history or physical examination.