Table 4.

Comparison of the radiographic results in octogenarians who underwent primary or revision total knee arthroplasty

		Primary	Revision	p value
Mechanical axis (degrees)	Preoperative	Varus 12.3 ± 7.3 (varus 27.3 – valgus 15.1)	Varus 8.8 ± 9.7 (varus 22.8 – valgus 9.8)	0.045
	Postoperative	Varus 1.0 ± 3.3 (varus 5.3 –valgus 4.7)	Varus 2.8 ± 4.3 (varus 7.4 – valgus 5.2)	0.003
Position of components (degrees)	α angle	95.6 ± 1.9 (92.6–99.8)	95.7 ± 2.9 (92.1–99.9)	0.938
	β angle	90.8 ± 2.0 (86.3–93.7)	90.5 ± 1.7 (86.6–93.9)	0.316
	γ angle	4.2 ± 3.3 (− 2.5–7.9)	3.2 ± 4.1 (− 2.3–7.2)	0.096
	δ angle	86.2 ± 3.1 (84.5–89.7)	86.1 ± 3.7 (81.5–90.2)	0.923

Data are presented as the mean ± standard deviation (range)