Cases include: 72-year-old male, increased pain and swelling of right knee, increases stiffness; 40-year-old female, progressive pain in right knee, increases with activity; 25-year-old female, pain and stiffness in neck; 14-year-old female, pain and swelling in right knee and lower leg; and 33-year-old male, severe pain and swelling in right knee after sudden change in direction in soccer.