Radiographic signs of ingrowth fixation

 

Moore et al CORR 2006

- 3 or more 97% stable

- 2 or less, 83% unstable

 

 

 

Five signs

- absence of radiolucent lines

- presence of a superolateral buttress

- medial bone stress-shielding

- radial trabeculae

- inferomedial buttress

 

Radiographic signs of loosening

5 signs

- radiolucent lines that appear after two years

- progression of radiolucent lines after two years

- radiolucent lines in all three zones

- radiolucent lines 2 mm or wider in any zone

- migration > 2mm

 

Engh Classification

 

I  Osse-ointegration

 

A  No RLL

B  One RLL zone 1 or 2

C  RLL zones 1 & 2

 

II Stable fibrous ingrowth

- <2mm zone 3

 

 

III Unstable fibrous ingrowth

- >2mm RLL in zone 3

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