A Systematic Review of Intra-Articular Ketamine for Postoperative Analgesia.

Background: This systematic review appraises the evidence from human clinical trials comparing postoperative pain scores and opioid consumption in patients receiving intra-articular ketamine versus other modalities of analgesia after orthopedic joint procedures.

Methods: Studies were identified from Embase, Scopus, and OVID Medline databases. Included studies compared patients receiving intra-articular ketamine versus other modalities of analgesia. The primary outcome of interest was postprocedural pain score and total opioid consumption, whereas secondary outcomes included time to rescue analgesic medication request, active range of motion, time to mobilization, and adverse effects.

Results: Seventeen studies were included. Dosage of ketamine varied widely from 0.25 to 2 mg/kg. Fifteen of 17 demonstrated decreased overall pain scores and decreased total postoperative opioid consumption in patients receiving intra-articular ketamine versus control groups. Included studies generally demonstrated reduced time to mobilization and increased latency until rescue analgesic medication in the intra-articular ketamine group.

Conclusions: Patients who received intra-articular ketamine generally reported lower pain scores and had lower postoperative opioid consumption after orthopedic joint procedures. This suggests that the intra-articular route of ketamine delivery may be a useful analgesic modality, although future larger-scale trials should explore its pharmacokinetics, optimal dosing, safety, and cost-effectiveness.