Long and short - the calves and hamstrings don't generate pain to the back.

The biggest pain generators are the SI joint and the lumbar facets with the ql muscle and gluts including piriformis slowing recovery because of tension.

Be careful choosing a osteopath some don't seem to manipulate, don't ask me why, because they are taught it undergrad level.

If you see a chiropractor they are trained in musculoskeletal radiology and might take x rays on site to determine state of back curve, joints and disc. But check they have x ray machine it means a smoother ride.

Essentially do your research on practice which everyone you choose and pick a practitioner with at least 3 years of experience.