Perichondrial ring is:
Seen around foramen magnum
Seen around epiphyseal plate
More prominent in adults
Shear strength increases with age
The perichondrial ring- surrounds the growth plate circumferentially. Peri-chondrial ring extends towards metaphysis and become continuous with periosteum of metaphysis. With increasing age, perichondrial ring is thinned and its shear resistance (strength) is decreased.
Pediatric Ohopedics