Table 4 Comparison of lower limb alignment between the loosening group and control group

HKAA [°, (\(\overline{x }\) ± S)]

175.5 ± 2.78

177.50 ± 1.25

 − 2.268

0.034

mLDFA [°, (\(\overline{x }\) ± S)]

94.42 ± 2.57

92.76 ± 1.24

2.129

0.045

mMPTA [°, (\(\overline{x }\) ± S)]

91.50 ± 1.42

91.14 ± 0.78

0.777

0.446

The deviation angle between the lower limb alignment and the femoral prostheses force line [°, (\(\overline{x }\) ± S)]

5.88 ± 1.90

6.75 ± 1.78

 − 1.109

0.280

The deviation angle between the lower limb alignment and the tibial prostheses force line [°, (\(\overline{x }\) ± S)]

2.23 ± 1.09

0.83 ± 0.54

3.596

0.004