Inclusion Criteria:  Veterans in VA Rheumatology or Orthopedic clinics Chronic knee osteoarthritis Indication for joint injection Previous joint injections for palliation Patient expresses interest in increasing their physical activity Patient is able to walk 1/2 mile per day  Exclusion Criteria:  Intra-articular hardware or other contraindication to joint injection Lack of smart phone Acute exacerbation of osteoarthritis or knee pain Comorbid condition that precludes safe exercise