Long Term Safety and Efficacy Study of Tanezumab in Japanese Adult Subjects With Chronic Low Back Pain

Inclusion Criteria: * Duration of chronic low back pain for ≥3 months, and treatment with agents for low back pain for ≥3 months. * Primary location of low back pain must be between the 12th thoracic vertebra and the lower gluteal folds, with or without radiation into the posterior thigh, classified as Category 1 or 2 according to the classification of the Quebec Task Force in Spinal Disorders. * Subjects must be experiencing some benefits from their current stable dose regimen of oral NSAID (celecoxib, loxoprofen or meloxicam) treatment as described in the protocol, be tolerating their NSAID regimen, be taking this medication regularly during the 30 day period prior to the Screening visit and must have had some improvement in low back pain, but still require additional pain relief at Screening. * Subjects must maintain a stabilized, protocol specified NSAID dose regimen for at least the final 2 or 3 weeks of the Screening period. * Low Back Pain Intensity (LBPI) score of ≥5 at Screening. * Subjects must be willing to discontinue all pain medications for chronic low back pain except rescue medication and investigational product and not use prohibited pain medications throughout the duration of the study. * Female subjects of childbearing potential and at risk for pregnancy must agree to comply with protocol specified contraceptive requirements. Exclusion Criteria: * Subjects exceeding protocol defined BMI limits. * Diagnosis of osteoarthritis of the knee or hip as defined by the ACR combined clinical and radiographic criteria. * Subjects who have Kellgren Lawrence Grade \> or =2 radiographic evidence of hip or Grade \> or =3 radiographic evidence of knee osteoarthritis will be excluded. * Subjects who have Kellgren Lawrence Grade \< or =2 radiographic evidence of knee osteoarthritis but who do not meet ACR criteria and do not have pain associated with their knee osteoarthritis will be allowed. * Subjects with symptoms and radiologic findings consistent with osteoarthritis in the shoulder. * History of lumbosacral radiculopathy within the past 2 years, history of spinal stenosis associated with neurological impairment, or history of neurogenic claudication. * Back pain due to recent major trauma within 6 months prior to Screening. * Surgical intervention during the past 6 months for the treatment of low back pain. * Planned surgical procedure during the duration of the study. * History or radiographic evidence of other diseases that could confound efficacy …