Patients repeatedly suffer this condition and often have blue scleras in a genetic disease caused by a similar mutation to Ehlers-Danlos syndrome. Medical shorthand indicates this condition with a pound sign. This condition is the most common cause of compartment syndrome and malunions. Patients with OI (“O-I”) are genetically prone to this condition and take bis·phosphonates to maintain a higher density of (*) hydroxy·apatite. This condition is called an avulsion if tissue shears off a ligament or tendon under stress, whereas its “greenstick” form is most common in children or sufferers of osteoporosis. The skin is punctured in the “compound” form of this condition. For 10 points, what painful condition can be treated by immobilizing skeletal tissue inside a plaster cast? ■END■