Does skateboarding commonly mess up your knees and shoulders?

Skateboarding: Typically more stress on the ankles falls can create knee and shoulder injuries, sprains, strains, contusions, tears. Thus good padding helps.

Worse: I have examined dozens of skateboarders with chronic back pain. Examination finds that repetative pratfalls have permanently loosened their pelvises. Many have nocturia, restless & painful sleep, & irritable bowel syndrome & can sit for less than an hour. Pelvic parasympathetic nerve impingement within pelvic plexus causes colon & bladder smooth muscle spam. My report submitted for publication.