Table 1 Comparison of patient demographics between the unrestricted KA TKA and native knee groups. Values are mean ± standard deviation (range)

Age (years)

68 ± 8 (52–81)

64 ± 7 (52–82)

p = 0.137

Sex (male) n

14 (56%)

14 (56%)

p = 1.00

BMI (kg/m^2)

31.0 ± 5.4 (22.2–42.2)

29.0 ± 4.8 (22–40)

p = 0.178

Time to follow-up (months)

8 ± 1 (6–9)

n.a

n.a

ACL condition (intact) n (%)

17 (68%)

n.a

n.a

Knee extension (deg)

7 ± 6 (0–22)

n.a

n.a

Knee flexion (deg)

115 ± 13 (85–138)

n.a

n.a

Varus deformity n (%)

17 (68%)

n.a

n.a

Valgus ( +)/varus (-) (deg)

3.7 ± 4.6 (-4.0 to 15.4)

n.a

n.a

Kellgren-Lawrence grade

 II

3 (13%)

n.a

n.a

 III

13 (52%)

n.a

 IV

8 (32%)

n.a

Preoperative functional outcome scores

 Oxford Knee Score (48 best, 0 worst)

29 (21–37)

n.a

n.a

 Knee Society Score (100 best, 0 worst)

50 (39–70)

n.a

n.a