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Table 2 Radiological variables in the +IPI and −IPI group

From: Risk factors for iliopsoas impingement after total hip arthroplasty using a collared femoral prosthesis

  +IPI group (n = 15) −IPI group (n = 191) P value
Number of patients 15 181  
Dorr classification, no. (%)*    < 0.001a
 Type A 2 (13.3) 54 (28.3)  
 Type B 4 (26.7) 109 (57.1)  
 Type C 9 (60) 28 (14.6)  
Stem alignment (°)    0.065
 Mean (SD) 1.2 (1.9) 0.4 (1.6)  
 Median (range) 1 (− 1–3) 0 (− 2–3)  
Stem anteversion (°)*    < 0.001
 Mean (SD) 19.1 (8.9) 15.2 (2.9)  
 Median (range) 16 (10–39) 15 (9–25)  
CPL (mm)*    < 0.001
 Mean (SD) 2.6 (2.3) − 0.5 (1.1)  
 Median (range) 3 (− 2–5) 0 (-2-1)  
  1. CPL collar protrusion length, SD standard deviation
  2. *Difference of data statistically significant (P < 0.05)
  3. aFisher exact test