1) Lateral center-edge angle : 25° til 39°

  • >39°: pincer type impingement
  • <20°: acetabular dysplasia 
  • 20° og 25°: borderline acetabular dysplasi

 

2)  Acetabulærindeks : 3-13º

  • > 10º  acetabular dysplasi
  • <3° Pincer impingement

 CE-vinkel < 20 grader i kombination med en stejl acetabulum (AI > 10 grader) og med acetabulær retroversion kan være indikation for PAO 

 

3) Crossover / 8-tal sign (femoroacetabular / pincer impingement)

indikerer acetabular retroversion 

Nicolas J. et al.  showed that the crossover sign has a sensitivity of 96%, a specificity of 95%, a
positive predictive value of 90% and a negative predictive value of 98% to detect acetabular retroversion.  

 

4) Posterior wall sign (femoroacetabular impingement)

 acetabular retroversion eller acetabular dysplasi

 

5) ischial spine sign:

acetabular retroversion

predictor of acetabular retroversion has a sensitivity of
91%, a specificity of 98%, a positive predictive value of 98% and a negative predictive value of 92%

 

6) LJSW ( lateral ledspaltehøjde) 4 mm +

< 3 mm tegn på degenerative bruskforandringer.

6) Alfa vinkel:

Normal alfavinkel < 55° Normal offset > 10 mm

Patologisk alfavinkel > 50°Nedsat offset < 10 mm = CAM

 


Yngre patienter med hofteledssmerter. Ugeskriftet for læger, 6. jan. 2020

 

Hip Imaging and Injections. Clinics in Sports Medicine, 2021-04-01, Volume 40, Issue 2, Pages 241-258.