The Phelps Community Center School Age Program is a NYSOCFS Certified program held at the Phelps Community Center, 8 Banta Street, Suite 100, Phelps, N.Y. 14532. This program will include quiet time to study and do homework, weekly themes, a weekly trip to the library, gym time, arts and crafts, games, and much more!
View All. A subchondral bone cyst is a fluid-filled sac that forms inside of and extends from the bone of a joint. It is seen on x-rays in cases of osteoarthritis. These cysts are not treated. They are a sign of osteoarthritis, although they do not occur in all cases.
Figure 3:Communicating and noncommunicating subchondral cysts. In the intrusion theory of cyst formation, the cyst starts open and later becomes covered. In the bone contusion theory, the cyst develops before opening up to communicate with the joint.