The authors reviewed 10 @entity1 with @entity174 associated with extensive @entity2530 of the femoral head and distinguished these @entity174 from @entity2249 The mean age of the @entity1 was 52 years (range, 36-68 years). Nine @entity1 were younger than 60 years. Eight @entity1 had risk factors for @entity2530 . Necrosis was extensive and involved nearly the whole femoral head. @entity174 occurred at the junction between a necrotic bone and reparative bone and extended downward through the reparative interface to the @entity2249 . @entity1 experienced @entity158 that was aggravated gradually during a period of 1 to 24 weeks before diagnosis of the @entity174 . In all @entity1 , the opposite femoral head was involved with @entity2530 . In two femoral heads, slight collapse or subchondral @entity174 (crescent sign) also was observed. No @entity1 had a history of precipitating @entity130 . In @entity1 younger than 60 years with a subcapital @entity174 , @entity174 associated with extensive @entity2530 of the femoral head should be suspected when a history of @entity130 is not obvious, when the opposite hip shows findings of @entity2530 , and when the @entity1 has a risk factor of @entity2530 . In these @entity174 , osteosynthesis rarely should be considered because of the high failure rate caused by additional progression of extensive @entity2530 and the probability of nonunion.

XXXX associated with extensive @entity2530 of the femoral head.

@entity1 :: ('9606', 'Species') :: ['Patients', 'patients', 'patient'] @entity2249 :: ('MESH:D005265', 'Disease') :: ['traumatic femoral neck fractures', 'healthy inferior cortex of the femoral neck'] @entity174 :: ('MESH:D050723', 'Disease') :: ['fractures', 'subcapital fractures', 'Fracture', 'fracture'] @entity158 :: ('MESH:D010146', 'Disease') :: ['hip pain'] @entity130 :: ('MESH:D014947', 'Disease') :: ['trauma'] @entity2530 :: ('MESH:D010020', 'Disease') :: ['osteonecrosis']
@entity174 :: (MESH:D050723,Disease) :: ['Subcapital fractures']
