1. Two cases of double-layer meniscus;Suzuki;Arthroscopy (in Japanese),1990
2. Two cases of the unusual abnormality of the lateral meniscus with accessory meniscus;Yamazaki;Arthroscopy (in Japanese),1994
3. A ring-shaped medial semilunar cartilage;Basmajian;J Bone Joint Surg Br,1952
4. Congenital absence of the anterior cruciate ligament associated with a ring meniscus;Noble;J Bone Joint Surg Am,1975
5. Appendix to arthroscopic anatomical knowledge of the knee joint. Part 2: The Meniscus;Ikeuchi;J Japanese Soc Orthopaedic Assoc,1978