Two Cases of Inferior Dislocation of the Patella with Impaction into the Femoral Trochlea of Osteophytes on the Superior Pole of the Patella - Shinji Yoshioka; Yuji Arai; Kazuya Ikoma; Shinya Fujita; Takanori Akai; Ryuichi Sakuragi; Katsuhito Muneyasu; Toshikazu Kubo (Case Reports in Orthopedics)