1. Specimen of internal semilunar cartilage as a complete disc;Watson-Jones,1930
2. A ring-shaped medial semilunar carilage;Basmajian;J Bone Joint Surg Br,1952
3. A ring-shaped medial semilunar cartilage;Basmajian;J Bone Joint Surg Br,1957
4. Discoid medial meniscus;Johnson;Clin Orthop,1982
5. Operative arthroscopy;McGinty,1991