The<unk>  can identify spinal<unk>  root compression, which is associated with disc protrusion and<unk><unk>  injury. It can reliably identify spinal<unk>  root compression for L2, L3, and L4. It is usually positive for L2-L3 and L3-L4 (high lumbar) disc protrusions, slightly positive or negative in L4–L5 disc protrusions, and negative in cases of lumbosacral disc protrusion.
Femoral nerve stretch test
Percutaneous tibial nerve stimulation
Nerve conduction study
Gnathodynamometer
Tone decay test
Nerve biopsy
Elbow extension test
Optomyography