Key Finding
Adding genicular nerve block to standard adductor canal block plus IPACK for total knee arthroplasty provided no clinically meaningful improvements in pain control, opioid consumption, physical therapy clearance time, or opioid refill rates compared to standard nerve blocks alone.
This study examined whether adding an extra nerve block procedure (genicular nerve block) to standard pain management would improve outcomes for patients having total knee replacement surgery. Researchers compared over 5,000 patients who received different combinations of nerve blocks during their surgery at a major academic medical center between 2021 and 2024.
The researchers looked at four main questions: Did the extra nerve block help with pain control during hospitalization? Did it reduce pain in the recovery room? Did it help patients get cleared for physical therapy faster? Did it reduce the need for opioid refills within 90 days after surgery?
The results showed that adding the genicular nerve block made little to no meaningful difference in any of these areas. While some statistical differences were found, they were too small to matter in real-world patient care. Pain scores were similar between groups, opioid use was essentially the same, and the time to physical therapy clearance differed by only about one hour. There was no difference in whether patients needed opioid refill prescriptions.
What this means for patients: If you're having knee replacement surgery, the standard nerve block combination (adductor canal block plus IPACK) appears sufficient for most people. Adding the genicular nerve block doesn't provide meaningful additional benefit for the general knee replacement population, though it adds time, cost, and potential risks to your procedure. Your surgical team can help you understand which pain management approach is best for your individual situation and ensure you receive comprehensive care during your recovery.
This retrospective propensity score-matched cohort study (n=3,905 matched pairs across inpatient and outpatient settings) evaluated whether adding genicular nerve block to adductor canal block (ACB) plus infiltration between the popliteal artery and posterior knee capsule (IPACK) improved perioperative outcomes following primary TKA. After 1:1 propensity matching on demographics, psychosocial factors, and perioperative variables, researchers compared pain scores, opioid consumption, time to PT clearance, and 90-day opioid refills. Results demonstrated no clinically meaningful differences between groups across all measured outcomes. While some statistically significant differences emerged (median hospital opioid consumption: 55 vs 52 OMEs, p=0.001; time to PT clearance: 21 vs 22 hours inpatient, p<0.001), these failed to meet predetermined clinical significance thresholds. The study concluded that adding genicular nerve block to ACB/IPACK within a comprehensive multimodal analgesia protocol offers no clinically relevant benefit for the general TKA population, considering its additional cost, time, and potential adverse event risk.
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