Pain Management in Total Knee Arthroplasty

Primary Anesthetic and Analgesic Techniques

The PROSPECT guidelines recommend a multimodal approach for total knee arthroplasty (TKA) pain management, combining general anesthesia with femoral nerve block or spinal anesthesia with local anesthetic plus spinal morphine, supplemented with paracetamol, NSAIDs/COX-2 inhibitors, cooling techniques, and appropriate opioids based on pain intensity, as recommended by the American Society of Anesthesiologists 1
General anesthesia combined with femoral nerve block is recommended as the primary technique for surgery and postoperative analgesia, according to the American Society of Regional Anesthesia and Pain Medicine 1, 2
Alternatively, spinal anesthesia with local anesthetic plus spinal morphine can be used effectively, as suggested by the European Society of Anaesthesiology 1, 3

Paracetamol (acetaminophen) should be administered on a scheduled basis as a baseline analgesic, as recommended by the American College of Clinical Pharmacy 1, 4
Strong intravenous opioids should be used for high-intensity pain, according to the American Pain Society 1, 2
Weak opioids should be used for moderate to low-intensity pain, as suggested by the American Academy of Pain Medicine 1, 2
Cooling and compression techniques should be implemented to reduce local inflammation and pain, as recommended by the Orthopaedic Trauma Association 1, 4

For extended analgesia, consider continuous peripheral nerve block catheter techniques rather than single-shot injections, as suggested by the American Society of Regional Anesthesia and Pain Medicine 4

Be cautious with bilateral blocks in elderly patients or those with significant comorbidities due to increased risk of local anesthetic systemic toxicity, as warned by the American Society of Anesthesiologists 4