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Table 2 Results of RSA

From: Effect of symmetrical restoration for the migration of uncemented total hip arthroplasty: a randomized RSA study with 75 patients and 5-year follow-up

 

Mean stem migration (Stdev) in relation to direct postoperative reference examination

Early migration

Late migration

2 weeks

3 months

pvalue£

1 year

2 years

5 years

pvalue$

Rotation (°)

X-axis

 All stems

0.15 (0.52)

0.15 (0.65)

0.13

0.09 (0.67)

0.17 (0.61)

0.27 (0.79)

0.01

 Modular stems

0.12 (0.52)

0.11 (0.65)

0.54

0.01 (0.67)

0.12 (0.61)

0.16 (0.79)

0.18

 Standard stems

0.21 (0.49)

0.24 (0.72)

0.27 (0.72)

0.28 (0.66)

0.51 (0.68)

Y-axis

 All stems

0.66 (1.27)

1.03 (1.51)

< 0.001

1.05 (1.41)

1.23 (1.60)

1.47 (1.70)

< 0.001

 Modular stems

0.61 (1.27)

1.07 (1.51)

0.35

1.11 (1.41)

1.32 (1.60)

1.56 (1.70)

0.93

 Standard stems

0.76 (1.49)

0.95 (1.67)

0.92 (1.61)

1.03 (1.97)

1.25 (2.02)

Z-axis

 All stems

− 0.56 (0.57)

− 0.69 (0.68)

< 0.001

− 0.70 (0.71)

− 0.75 (0.77)

− 0.82 (0.77)

< 0.001

 Modular stems

− 0.55 (0.57)

− 0.69 (0.68)

0.74

− 0.69 (0.71)

− 0.76 (0.77)

− 0.81 (0.77)

0.62

 Standard stems

− 0.60 (0.70)

− 0.69 (0.82)

− 0.72 (0.83)

− 0.74 (0.95)

− 0.84 (0.89)

Translation (mm)

X-axis

 All stems

0.16 (0.25)

0.18 (0.26)

< 0.001

0.18 (0.27)

0.20 (0.29)

0.23 (0.30)

0.001

 Modular stems

0.14 (0.25)

0.18 (0.26)

0.50

0.16 (0.27)

0.19 (0.29)

0.21 (0.30)

0.15

 Standard stems

0.21 (0.29)

0.19 (0.32)

0.22 (0.33)

0.21 (0.39)

0.28 (0.33)

Y-axis

 All stems

− 0.76 (0.83)

− 1.00 (1.10)

< 0.001

− 1.00 (1.12)

− 0.89 (1.21)

− 0.92 (1.11)

0.09

 Modular stems

− 0.70 (0.83)

− 0.88 (1.10)

0.17

− 0.88 (1.12)

− 0.84 (1.21)

− 0.86 (1.11)

0.77

 Standard stems

− 0.90 (0.89)

− 1.25 (1.21)

− 1.25 (1.22)

− 1.01 (1.49)

− 1.05 (1.07)

Z-axis

 All stems

0.01 (0.26)

0.03 (0.34)

0.22

0.06 (0.42)

0.02 (0.40)

0.01 (0.44)

0.66

 Modular stems

0.00 (0.26)

− 0.02(0.34)

0.02

− 0.03 (0.42)

− 0.04 (0.40)

− 0.09 (0.44)

0.03

 Standard stems

0.03 (0.23)

0.14 (0.43)

0.25 (0.51)

0.14 (0.53)

0.23 (0.48)

  1. £p values for estimates of changes before 3 months representing the period when the stem settles in place
  2. $p values for estimates of changes from 3 months after surgery during which osseous integration and stabilization should have occurred
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X