The Use of Bone Growth Stimulators for Osteoarthritis of the Knee.

Inclusion Criteria: 1. Subjects must have diagnosis of osteoarthritis of the knee with radiographic evidence of joint space narrowing, Kellgren-Lawrence Classification grade Grade 3 or 4. 2. Subjects must discontinue corticosteroids administered by any route except intranasal spray, steroid- containing ophthalmic solutions and anti-asthmatics. 3. Subjects must speak English. 4. Subject must be willing and able to sign an informed consent document. 5. Subjects must be willing and able to comply with all study procedures for the duration of the clinical study. Exclusion Criteria: 1. Subjects with a diagnosis of inflammatory arthritis such as rheumatoid arthritis, gout, joint infection, Lyme disease, or systemic lupus erythematosus. 2. Subjects with a diagnosis of secondary arthritis such as acromegaly, Charcot's arthropathy, hemochromatosis, or Wilson's disease. 3. Subjects who have had an injury to the index knee within 6 months of starting treatment. 4. Subjects must NOT have had arthroscopy within 8 weeks of starting treatment. 5. Subjects must NOT have had viscosupplementation within 8 weeks of starting treatment. 6. Subjects who plan to have surgery on the target knee within the study period. 7. Subjects with surgical metallic hardware in the target knee. 8. Subjects who are unwilling or unable to adhere to the follow up schedule and procedures. 9. Subjects who are pregnant.