Hi, It is nice to know that you do not wish to be on opioid analgesics like oxycontin for long in spite of suffering so much. The best and easiest way to come off opioids is to gradually decrease the dosage before ultimately stopping completely. During this process you may suffer from mild withdrawal symptoms like aches and pains, loose motions, running nose etc which can be managed with over the counter medicines. This will certainly be milder than the withdrawal from abrupt stopping of the drug. For osteopenia, you will need calcium supplements and other medicines, depending on the cause of bone loss, like abnormal vitamin D levels etc. Hope this helps you. Best wishes.