Hi Xue,
So nice to see your excellent work again,
The video did not load up as the file was too large,
If you email it to me I can compress it and upload it for you, or you can do it yourself if it is easier.
Despite this the still images are really beautiful and make the case.
that tibial nerve is massively swollen.
I assume it was proximal to the bifurcation into the medial and lateral plantar nerves.
The symptoms seem to be medial plantar nerve related as this is the sensory neural provider for the first and second toes exclusively, with the 3rd toe being shared with the medial and lateral plantar nerves.
It is worth looking at the muscles of the foot for atrophy changes. The medial plantar nerve motor drives the Abductor Hallucis and the Flexor Digitorum Brevis muscles, while the Quadratus Plantae and the Abductor Digits Minimi are lateral plantar nerve driven. So it would be interesting to see if there was any subtle atrophy changes in the muscles and which muscles are involved.
As for the cause of the neural oedema. It does not look like a nerve sheath tumour as the fascicles are still intact, although swollen. So what would cause such dramatic neural oedema? In the tarsal tunnel any space occupying lesion could be a cause and a subtalar joint ganglion is the most common, however I can see no evidence of this.
I suspect the foot massage machine is unfairly compressing and irritating the nerve and perhaps the footwear of the patient also requires some assessment.
I will add more once I have seen the video.
Steve.