American Academy of Orthopedic Surgeons classification of periprosthetic hip fractures

The American Academy of Orthopedic Surgeons classification of periprosthetic hip fractures divides the femur into three separate regions:

  • level I: proximal femur distally to lower extent of lesser trochanter 
  • level II: 10 cm of femur distal to level I 
  • level III: femur distal to level II 

Fractures are classified accordingly:

  • type I: fractures proximal to intertrochanteric line; usually occur during dislocation of hip
  • type II: vertical or spiral fractures that do not extend past lower extent of lesser trochanter
  • type III: vertical or spiral fractures that extend past lower extent of lesser trochanter, but not beyond level II; usually at junction of middle and distal thirds of femoral stem
  • type IV: fractures that traverse femoral stem in level III or lie within that area
    • type IV-A: spiral fractures around tip of stem
    • type IV-B: simple transverse or short oblique fractures 
  • type V: severely comminuted fractures around stem in level III 
  • type VI: fractures distal to tip of stem in level III

 

Share article

Article information

rID: 52718
Synonyms or Alternate Spellings:
  • American Academy of Orthopedic Surgeons classification
  • AAOS classification

Support Radiopaedia and see fewer ads

Updating… Please wait.
Loadinganimation

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.