Comparative efficacy of analgesic techniques in total hip arthroplasty

This network meta-analysis pooled 112 randomized trials comparing 23 different regional analgesic techniques (nerve blocks, periarticular injection, intrathecal morphine, and combinations) against placebo in patients undergoing total hip arthroplasty. On the primary outcome, postoperative day 1 pain score, several techniques reached statistical significance versus placebo but none crossed the pre-defined MCID of 1.86 points on the VAS, meaning no technique produced a pain reduction patients would actually notice; secondary analyses found intrathecal morphine and iliopsoas block plus periarticular injection reduced opioid use, and intrathecal morphine and pericapsular nerve group (PENG) block shortened hospital stay.

AI summary · from the full text · reviewed by Pukhraj Gaheer, Medical Student, Queen's University before publishing

Why it mattersThis challenges the assumption, embedded in current PROSPECT guidelines, that specific regional blocks meaningfully reduce pain after hip arthroplasty, and instead points clinicians toward opioid-sparing and discharge-related benefits rather than pain control itself.

Presenting this at rounds? Start here

• ?The primary outcome (POD1 pain) showed many statistically significant pairwise differences that were then judged clinically insignificant using an externally sourced MCID of 1.86; how robust is that threshold, and could it be masking real differences in some subgroups?
• ?If no block meaningfully reduces day-1 pain, should a surgeon still choose PENG or intrathecal morphine purely for their opioid-sparing and length-of-stay benefits, and what does that mean for patients who cannot receive intrathecal morphine (e.g., outpatient/no spinal anesthesia)?