Recent diagnosis of osteoarthritis in left knee, supported by X-Ray. Pain has lessened somewhat due to favoring knee and use of cane. Problem is swelling of calf and foot, especially foot. Complicating factor may be frequent urination due to recent 6 week radiation regimen for biochemical re3currence evidenced on bladder wall. Elevation of foot and supine rest does not seem to remediate swelling; no dimpling or indication of coronary distress. Primary says " body trying to conserve water". Your opinion ?