I think the quadriceps group is driven by the femoral nerve typically supplied from L2, L3, and L4. Very close to your L5 injury. But maybe there’s an issue elsewhere – the nerve passes under or through the sartorius muscle, and can get pinched causing numbness / tingling in the outer thigh. You could try working that muscle with a lacrosse ball or foam roller and seeing if that improves anything. See attachments.
Leg paralysis when hinging the hip
Since 2 weeks I realized that when I bend my hip, the quadriceps of my left leg is getting weak immediately and I have a strange sensation. My MRI came back clear three days ago though. I had disk surgery on L5/S1 one year ago and relapse in November at same disk. No problems when standing or lying.
I’m very diligent on my physio training and just doing isometric excercises. I got PRT the first time three days ago, which felt good.
I know it’s a moonshot given the complexity of that injury.
Is there something I can/must do?
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