Targeting the Infrapatellar Branch of the Saphenous Nerve for Pain Relief in Patients With Acute or Chronic Knee Pain: A Systematic Review of Randomized Controlled Trials and Cohort Studies

Abstract

Blocking the infrapatellar branch of the saphenous nerve (IPBSN) can provide analgesic benefits for patients with postoperative acute pain or chronic pain, with minimal adverse effects. To evaluate the analgesic efficacy and potential adverse events associated with IPBSN block in patients suffering from acute or chronic knee pain. We conducted a systematic review across PubMed, Cochrane, Web of Science, and Embase to identify all relevant randomized controlled trials (RCTs) and cohort studies according to predefined selection criteria. The study quality of the RCTs was evaluated using the Cochrane risk of bias assessment tool, while cohort studies were assessed using the ROBINS-I risk of bias tool. The primary outcomes measured were pain intensity and opioid consumption following the nerve block. A total of eight studies were included in this systematic review, encompassing 613 subjects with 276 participants in the control group and 337 participants in the IPBSN block group. The level of evidence was rated high for the RCTs and moderate for the cohort studies. The nerve block was administrated either through the injection of local anesthetic or percutaneous cryoneurolysis targeting the IPBSN. The results indicated that the IPBSN block significantly improved pain relief and reduced opioid consumption in patients with acute postoperative or chronic pain, with no significant difference in the rate of adverse events relating to the procedures or device. The IPBSN block holds promise for improving pain relief and reducing opioid consumption. However, further well-designed randomized controlled trials are needed to confirm these results.

Keywords

arthroplasty / arthroscopy / knee pain / systematic review / the infrapatellar branch of the saphenous nerve

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2025 The Author(s). Orthopaedic Surgery published by Tianjin Hospital and John Wiley & Sons Australia, Ltd.