Subchondral insufficiency fracture
A subchondral insufficiency fracture refers to a type of stress fracture that occurs below the chondral surface on a weight-bearing surface of a bone.
They tend to occur when normal physiological forces are repeatedly applied to an area of bone.
Typical sites include
- knee: previously referred to as spontaneous osteonecrosis of the knee
- femoral head
- metatarsal head
- T1: may be characteristically low signal intensity band through the affected region
- T2: florid marrow edema