Ultrasound-guided lumbar selective nerve root block plus T12 paravertebral and sacral plexus block for hip and knee arthroplasty: Three case reports

AbstractRationale:For hip or knee arthroplasty, it is essential to develop a satisfied peripheral nerve block method that will benefit elderly patients or patients who are contraindicated to neuraxial anesthesia.Patients concerns:Patient in Case 1 suffered from the right intertrochanteric fracture,