This is a Phase 3, two-part, multi-center, open-label study designed to evaluate the PK and safety profile of EXPAREL in pediatric subjects aged 6 to less than 17 years when administered intraoperatively at the end of surgery via local infiltration. 90 pediatric subjects undergoing spine and/or cardiac surgeries are planned for enrollment.~Part 1 is a multicenter, randomized, open-label study in subjects aged 6 to less than 17 years undergoing spine or cardiac surgeries. There will be 2 treatment groups: Group 1 will include subjects aged 12 to less than 17 years, while Group 2 will include subjects aged 6 to less than 12 years~Part 2 is a multicenter, randomized, open-label, safety study in subjects aged 6 to less than 17 years undergoing spine or cardiac surgeries. There will be 2 treatment groups: Group 1 will include subjects aged 12 to less than 17 years, while Group 2 will include subjects aged 6 to less than 12 years.~Subjects will be screened within 30 days prior to study drug administration. During the screening visit, subjects will be assessed for past or present neurologic, cardiac, and general medical conditions that, in the opinion of the investigator, would preclude them from study participation.~Subjects will undergo their pre-planned spinal or cardiac surgeries per the institution's standard of care. On Day 1, eligible subjects will receive the study drug intraoperatively at the end of surgery via local infiltration into the surgical site. Dosing of EXPAREL will be based on body weight, with a starting dose of 4 mg/kg (maximum 266 mg).~There is no required length of stay in the hospital; subjects may be discharged based on the medical judgment of the treating physician.~A follow-up phone call will be scheduled for all subjects on Day 7. A final follow-up visit will be made on Day 30 to all subjects who would have received the study drug.
Primary Objective: To evaluate the pharmacokinetics (PK) of EXPAREL in pediatric subjects aged 6 to less than 17 years undergoing various types of surgeries.~Secondary Objective: To evaluate the safety of EXPAREL in pediatric subjects aged 6 to less than 17 years undergoing various types of surgeries.