{"nct_id":"NCT00477217","title":"Zoledronic Acid Treatment of Spontaneous Osteonecrosis of the Knee","status":"WITHDRAWN","status_verified_date":"2016-09","start_date":"2008-01","start_date_type":null,"primary_completion_date":"2009-05","primary_completion_date_type":"ACTUAL","completion_date":"2009-05","completion_date_type":"ACTUAL","phases":["PHASE2"],"tickers":["NVS"]}