63 下列關於關節囊內股骨頸骨折（intracapsular femoral neck fracture）之敘述，何者最正確？
(A) Garden type II 股骨頸骨折屬移位性骨折（displaced fracture）
(B)年輕人之股骨頸骨折常見於高能量性創傷（high-energy trauma）
(C)移位性股骨頸骨折之治療原則為開放性復位內固定手術（open reduction and internal fixation）
(D)缺血性壞死（osteonecrosis）是最常見之合併症

(A) The Garden II fracture is complete but undisplaced, and the trabecular lines in the head are colinear with those in the acetabulum and the femoral neck distal to the fracture,故不屬於位移性骨折

(B) In younger adults these injuries(femoral neck fracture) are often the result of high-energy trauma.年輕人常是高能量性創傷造成

(C) For the majority of patients with a displaced intracapsular hip fracture an arthroplasty is the best choice. A displaced fracture in a young patient should be treated by reduction and fixation as soon as possible. In most patients closed reduction is satisfactory.大部分病人以arthroplasty為最佳治療；年輕病人較常使用CRIF,不夠才考慮用ORIF

(D) Osteonecrosis, or avascular necrosis, is a well-recognized complication of femoral neck fracture, but is not frequently encountered in clinical practice. (因近20年來arthroplasty漸漸取代internal fixation); 最常見的應是delayed union, malunion及nonunion