Low-Angle Fixation in Fractures of the Femoral Neck
Garden JBJS-B 1961

Stage I - Incomplete and abducted or valgus impacted
Stage II - Complete and non-displaced
Stage III - Complete partially displaced
Stage IV - Complete fully displaced

Pauwels Classification 1935

I - up to 30 degrees
II - 30 - 50 degrees
III - greater than 50 degrees

a line drawn thru the fracture on the AP x-ray in relation to a line from the horizontal

Bonus credit - look up Wards Triangle first described in 1838

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