The standard treatment combination used to treat patients with osteosarcoma is doxorubicin, cisplatin, and methotrexate with or without ifosfamide. When this treatment combination is given in the hospital, it can require around 18-22 hospital stays. Somewhat recently, chemotherapy for osteosarcoma has become possible to give in the outpatient clinic. Researchers want to learn if giving 4 certain drugs (the combination of doxorubicin, cisplatin, and methotrexate with or without ifosfamide) in the outpatient setting to eligible patients will help to decrease the number of hospital stays.