Leah
Perhaps a good question to ask might be what do podiatrist do to avoid back injury.
When I was training I suffered terrible back pain when using the practitioner chairs and each weekend would find me at my favourite physiotherapist. I thought I would not be able to continue in Chiropody practice. Fortunately quite by chance I found that using a low stool with no back was the answer and I never have any back problems now.
The reason for this is that the low stool, which is set so that my knees are flexed at less than 90dgs, ie my knee is higher than my hip, enables and compels me to rest my elbows on my knees and therefore flexing moments about the lumbar spine are resisted by my arms and not the lumbar muscles.This also tends to prevent kyphosis (slouching) in the upper spine.
I found this out because in my first practise I took over an opticians clinic and used his patient chair and stool. I changed the patient chair to a podiatry type but kept the old stool.
BTW My first patients could not see how removing a corn would improve their myopia. I took them outside and asked them if they thought they were still short sighted, "of course" would be the response. "Look up in the sky" I then said, "what do you see". "The sun" they replied". "That's 93 million miles, how far do you want to see then"
Larf!

Cheers Dave Smith