An injury is a search; a conditions list is not. Somebody typing the outside of their knee hurting after five kilometres wants that exact page, and a clinic offering one gets the booking before the comparison starts.
Searches naming an operation are gold. The patient knows the procedure, knows rehabilitation is coming and is looking weeks ahead — which is the calmest and best-informed enquiry a clinic receives.
The referral question is typed thousands of times and answered almost nowhere. It costs one page and removes the belief that stops people booking at all.
Injuries follow a calendar. January gyms, spring marathon training, the first week of a new season: each brings the same complaints at the same time every year, and pages written in advance catch all of them.