Cohort study to examine the effect of age on duration of analgesia in patients receiving single-shot femoral nerve block prior to surgery, by postoperative phone follow-up questionnaire.

The purpose of this study is to find out how differences in age can affect the duration of pain relief from a femoral nerve block. Complete recovery after leg surgery involves healing of tissues at the surgical site, recovery of muscle strength and range-of-motion. Some pain is normally experienced after leg surgery. At the hospital, pain is usually treated with pain medicines, and/or a nerve block procedure. A nerve block involves injecting a local anesthetic beside the nerves to numb the nerves that supply feeling to the knee joint and surrounding tissues. The choice as to whether a participant has a nerve block or not is made by the participant and their surgeon and is not determined by this research study. The study aim is to find out how long a nerve block can relieve postsurgical pain, and whether that duration is affected by the age of the participant.

Inclusion Criteria:

• Adult patients (age >18 years)
• American Society of Anesthesiology physical status 1-3
• Having ambulatory surgery, who have received a single-shot femoral nerve block
• Able to read and understand English
• Have access to a phone after surgery

Exclusion Criteria:

• Pediatric patients (age <18 years)
• American Society of Anesthesiology physical status >3
• Unable to read and understand English
• Unable to have access to a phone after surgery

Adult ambulatory surgery patients receiving a single-shot peripheral femoral nerve block preoperatively as part of their clinical anesthesia care on day-of-surgery.