I get that, I've been there. The vet advice I was given was that work and monitoring how he was coping would be better for him as it would strengthen him and the surrounding areas would then be better able to support the problem one. If he broke, well the chances were he'd have broken anyway and possibly sooner due to getting weaker. It can be nerve wracking but I started very slowly, progressed very slowly, and monitored tightly every day before and after work.
I wonder, if tests were run, how many horses wouldn't have underlying problems either from conformation or injury? My suspicion is very few, just like very few adult people don't carry injury niggles or weaknesses. Sometimes I think all the modern diagnostics can do as much harm as good, particularly when people lose sight of the bigger picture. I'm never sound, but I'm not ready to be doing nothing yet and if I did I'd seize up completely!