Peripheral Nerve Stimulation of Genicular Nerves Versus Conventional Therapy With Intra-articular Steroid Injection for Chronic Knee Pain: A Prospective, Randomized Pilot Study

To compare the effects of the following types of therapy on knee range of motion when given to patients with chronic knee pain: * A standard steroid injection * Peripheral nerve stimulation (PNS) therapy in combination with a standard steroid injection * PNS therapy in combination with a placebo injection Steroid injections are given directly into the knee joints and are considered to be the standard therapy for chronic knee pain. In this study, the injection will be made of the steroid drugs triamcinolone and bupivacaine.

Inclusion Criteria: * Patients diagnosed with chronic knee pain (baseline pain score \>=4), seen at Pain Management Center at MD Anderson Cancer Center; if patient has bilateral knee pain, the side with the more severe knee pain will be treated first and counted towards the primary and secondary endpoints * Patients between ages 18-85 years old * Patient signed informed consent Exclusion Criteria: * Patients with cognitive dysfunction or without capacity to consent * Patient with recent history (\