Deltoid ligament injury
Etiology
Ankle sprain
- eversion / external rotation
Ankle fractures
Ankle sprain
- eversion / external rotation
Ankle fractures
Much less common than hip and knee OA
Patients tend to be younger
Inflammation and degeneration of the achilles tendon in the midsubstance 2 - 6 cm from insertion
Intermediate grade chondroblastic osteosarcoma arising from surface of long bones
Extremely rare
- 1% of all osteosarcomas
- 25% of surface osteosarcomas
Age 15-25
Typically anterior proximal tibia
- diaphysis of major long bones
- humerus
Ossification of the posterior longitudinal ligament (OPLL)
Heterotopic ossification of the posterior longitudinal ligament
2:1 Male:Female
More common in Japanese and East Asian populations