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80% of all FAI's are the product of an unstable, but not necessarily painful, lumbar spine.
FAI symptoms are caused by excessive hip movement which causes either the cam or pincer impingement. OS can shave as much as the bone back, but unless the underlying instability is identified and then corrected, having a painless post op hip doesn't mean that it's fixed.
It also doesn't mean that having an op will not be successful (very) if it's not tailored up with a good functional rehab program that doesn't just concentrate on hip mobility and strength. It must incorporate lumbar spine stability patterning.
Sorry....I'll get me coat
FAI - emperor's new clothes?
Symptoms are rarely caused by only having cam or pincer impingements. Prolonged rest (totally unrealistic!) would eliminate symptoms.
The symptoms are most likely due to have having poor control, which caused the extra bone growth leading to the FAI....Control and function need nailing or failing to progress into invasive treatment.
Even with invasive treatment, which some people will definately need, unless the control issue is nailed post op, I'm pretty sure symptoms will appear at a much later date.