Can spinal fusion surgery cause bilateral peroneal neuropothy?

Are: You referring to your groin or your ability to move your feet up ?

It is very unusual: I have not seen that, but that does not means could not happen from the surgery itself. The other issue could cause, is unusual pressure on the nerves from out side. .

Neuropathy : Bilateral peroneal mononeuropathies are commonly seen in patients with mononeuritis multiplex secondary to diabetes, polyarthritis nodosa, nutritional deficiencies, and critical illness polyneuropathy. Bilateral and symmetrical presentation rises the possibility of lumbar radiculopathies or lumbar stenosis. Neuroimaging like MRI and electrophysiological studies like EMG and nerve conduction study could help in sorting this out.