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.
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Incidence of Adverse Events, Graded According to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version (v) 4.0
Timeframe: through study completion; an average of 1 year