Effect of Rebound Pain on Chronic Postsurgical Pain After Total Knee Arthroplasty

N/ANot Yet RecruitingNCT07511985

Konya City Hospital220 enrolled

Overview

This prospective observational study aims to evaluate whether rebound pain after peripheral nerve block is associated with the development of chronic postsurgical pain following elective total knee arthroplasty. Adult patients undergoing unilateral total knee arthroplasty under spinal anesthesia and receiving a peripheral nerve block as part of routine multimodal analgesia will be included. No additional intervention, drug administration, or biological sampling will be performed beyond standard clinical care. Rebound pain will be assessed during the early postoperative period using pain diaries, numeric rating scale pain scores, and analgesic consumption records. Chronic postsurgical pain and related outcomes will be evaluated at postoperative 3 and 6 months using validated instruments assessing pain severity, neuropathic pain features, psychological status, functional outcomes, and health-related quality of life. The primary outcome is the presence of chronic postsurgical pain at 3 months after surgery. Secondary outcomes include chronic pain at 6 months, pain intensity, neuropathic pain characteristics, opioid consumption, rescue analgesic requirements, sleep disturbance, and quality-of-life measures. The study also aims to explore demographic and clinical factors associated with rebound pain and chronic postsurgical pain.

Study Type

OBSERVATIONAL

Enrollment

220

Conditions

Acute Pain, Postoperative Chronic Pain Arthroplasty, Replacement, Knee

Eligibility

Medical Language ↔ Plain English

Inclusion Criteria: * Age 18 years or older * ASA physical status I to III * Scheduled for unilateral elective total knee arthroplasty * Planned to undergo spinal anesthesia * Planned to receive a peripheral nerve block as part of routine multimodal analgesia * Able to provide informed consent and complete study assessments Exclusion Criteria: * Chronic opioid use (60 mg oral morphine equivalent per day or more, or use for 3 months or longer) * Significant neuropathy or radiculopathy * Bilateral or two-stage total knee arthroplasty during the same hospitalization * Contralateral total knee arthroplasty within the previous 6 months * Severe cognitive impairment or major psychiatric disorder * Chronic analgesic dependence

Outcomes

Primary Outcomes

Presence of Chronic Postsurgical Pain at 3 Months

Chronic postsurgical pain will be defined as pain developing or persisting after total knee arthroplasty that is not explained by another cause. Participants with pain and at least one Brief Pain Inventory-Short Form interference item score of 3 or higher at postoperative month 3 will be considered positive for chronic postsurgical pain.

Time frame: 3 months after surgery

Secondary Outcomes

Presence of Chronic Postsurgical Pain at 6 Months assessed by Brief Pain Inventory-Short Form (BPI-SF) interference score

Presence of chronic postsurgical pain at postoperative month 6 will be assessed using the same Brief Pain Inventory-Short Form (BPI-SF)-based study definition applied at month 3: pain not explained by another cause, NRS \>0, and at least one BPI-SF interference item score of 3 or higher.

Time frame: 6 months after surgery

Pain Intensity in the Early Postoperative Period

Pain intensity at rest and during movement will be assessed using the Numeric Rating Scale during the first 72 hours after surgery.

Time frame: 0 to 72 hours after surgery