Shielding the Joint: The kneecap functions as being a protect, preserving the sensitive structures of the knee joint, just like the cartilage and ligaments, from immediate effects. The American Academy of Orthopaedic Surgeons (AAOS) explains which the patella can crack in alternative ways, ranging from hairline cracks to accomplish shattering. https://www.theorthopaedicandpainpractice.com/what-are-patella-fractures/