Our experience:
Son complained of hip flexor issues, usually at the start of the high school season. Coming off basketball, then going into a SS position where you move side to side. He complained every year about the same time of year. FINALLY, took him to an ortho to get an xray and some PT his senior year.
His Freshman year in college he heard/felt a "pop" in his hip. Got a contrast MRI and it showed he had a hip impingement with tears. He played through the season with a cortisone shot. Had surgery on both hips, one month apart, during the following summer since impingements are usually bilateral and inherited. This was on the college's insurance dime, btw, since he heard the pop in college and treatment started there.
It was probably the impingements that were bothering him in HS. Apparently it can be a fairly common thing among short stops. Son kept telling me "A-Rod had it done"!