Acetabulum/injuries; Athletic Injuries/etiology; Fractures, Bone/etiology; Horses; Pelvic Bones/injuries; Accidental Falls; Acetabulum/surgery; Adolescent; Adult; Aged; Animals; Athletic Injuries/surgery; Female; Follow-Up Studies; Fracture Fixation, Internal; Fractures, Bone/surgery; Head Protective Devices; Hospitalization; Humans; Ilium/injuries; Ilium/surgery; Length of Stay; Male; Middle Aged; Pelvic Bones/surgery; Protective Clothing; Pubic Bone/injuries; Pubic Bone/surgery; Sacroiliac Joint/injuries; Sacroiliac Joint/surgery