For nerve block I took the advice of someone else on here and started approaching from lateral. I forget who that was but maybe they can chime in too. It’s much less painful. For small/medium knees I feel the condyles and mark, then verify with ultrasound, then go in blind with a 27g 1.5”, perpendicular to skin down to bone, inject 0.5 mL local, redirect proximal or distal and inject another 0.5 mL. For big patients where I can’t feel landmarks, I do it under fluoro with a 25g 3.5”. Mark in AP then trace straight down to the side of the knee (like you’d do for a GT bursa), stick the needles in parallel to the table to the target points.
For the RF I did yesterday, I came in from lateral with a 27g under fluoro, and injected about 2 mL 2% lidocaine all along the sides of the femur and tibia along the target area. Then I localized the skin from AP and put the RF needles in from AP, injecting additional local as I get close to the targets to fully anesthetize the needle tract. That worked really well - she had a lot less pain than previous patients.