Long-term Safety of PF-00345439 (Oxycodone)

Inclusion Criteria: * Males and females who are ≥ 18 and ≤ 75 years of age with moderate to severe pain in one or more hip or knee joint(s) caused by osteoarthritis for at least three months prior to the Baseline Visit or persistent moderate to severe low back pain for at least six months while regularly taking one or more of the following types of oral analgesic medication(s) prior to the Baseline Visit. * Patient agrees to refrain from taking any opioid medications other than study drug during the study period. Patients must agree to report all non-opioid analgesic medications taken. * Females who are postmenopausal, physically incapable of childbearing, or practicing an acceptable method of birth control. Acceptable methods of birth control include surgical sterilization, hormonal contraceptives, or double-barrier methods (condom or diaphragm with a spermicidal agent or IUD). If practicing an acceptable method of birth control, a negative urine pregnancy test result has been obtained at the Baseline Visit. Exclusion Criteria: * Patient has a positive urine drug screen at the Baseline Visit. * Patient currently is on an opioid regimen with a daily opioid dose equivalent of oxycodone \> 160 mg. * Patient has major surgery planned during the proposed study period.