![](http://www.alamy.com/thumbs/6/E8EE02E4-6AD2-4EA1-9239-303184B6B338/2ACPWPD.jpg)
Paprosky femur defect. Cutaway artwork of bone degradation in a type IV medial-lateral femur cortex defect (Paprosky classification system). This syst
Paprosky femur defect. Cutaway artwork of bone degradation in a type IV medial-lateral femur cortex defect (Paprosky classification system). This system is used for revision (replacement or repair) of a hip implant. The ball and socket part of the implant is at top. The rest of the implant consists of a shaft inside the femur (thigh bone). The amount of degradation in the cortical (outer) bone layer determines the amount of bone grafting needed, and whether a cementless implant can replace a cemented one. Type IV defects make the shaft unable to support weight (see C016/6620 for other types). Named for US surgeon Wayne G. Paprosky, the classification was developed in the 1980s and 1990s.
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Photo credit: © D & L GRAPHICS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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