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Table 3 CH and Subsidence: appearance in Gruen Zones over course of 5 years

From: Prospective 5-year study with 96 short curved Fitmore™ hip stems shows a high incidence of cortical hypertrophy with no clinical relevance

 

1 year

2 year

3 year

5 year

Cortical hypertrophy

 AP: Y/N

68.8%

68.8%

69.8%

70.8%

 AP Gruen zone 1

 AP Gruen zone 2

42%

40%

42%

40%

 AP Gruen zone 3

58%

57%

57%

59%

 AP Gruen zone 4

 AP Gruen zone 5

43%

44%

45%

46%

 AP Gruen zone 6

16%

18%

18%

18%

 AP Gruen zone 7

 Mean medial distance [mm] (SD)

10.42 (± 2.08)

10.53 (± 2.09)

10.48 (± 2.19)

10.38 (± 2.14)

 Mean lateral distance [mm] (SD)

9.89 (± 2.05)

9.92 (± 2.09)

9.75 (± 2.01)

9.72 (± 2.04)

 Axial: Y/N

11.5%

11.5%

11.5%

11.5%

 Axial Gruen zone 8

2%

2%

2%

2%

 Axial Gruen zone 9

6%

5%

5%

5%

 Axial Gruen zone 10

2%

3%

3%

3%

 Axial Gruen zone 11

 Axial Gruen zone 12

5%

6%

5%

6%

 Axial Gruen zone 13

3%

2%

3%

3%

 Axial Gruen zone 14

 Mean ventral distance [mm] (SD)

9.09 (± 2.51)

9.9 (± 2.69)

9.4 (± 2.37)

9.55 (± 2.58)

 Mean dorsal distance [mm] (SD)

9.45 (± 3.53)

9 (± 3.5)

3.5 (± 3.24)

9.55 (± 3.42)

Subsidence

 [mm] (SD)

− 1.62 (± 1.55)

− 1.78 (± 1.6)

−1.8 (± 1.67)

−1.93 (± 1.72)