Table 6 Basic demographics of patients with PFC-Sigma and Attune implants and comparison of means of various parameters between PFC-Sigma and Attune knees within FBRD and FBRE groups, both before and after surgery

Total number of patients

93

78

Males

35 (37.6%)

25 (32.1%)

Females

58 (62.4%)

53 (67.9%)

Age (years)

65.8 ± 8.6 (44–83)

67.5 ± 8.5 (50–89)

BMI (kg/m²)

28.9 ± 3.5 (21.2–40.2)

29.2 ± 4.5 (21.9–45.4)

FBRD group (before surgery)

n = 93

n = 78

HKA angle (degrees)

167 ± 8.5 (150.8–189.1)

166 ± 7.6 (150.3–182)

Knee flexion (degrees)

128.4 ± 13.6 (100–155)

129.2 ± 12 (100–154)

KSKS

57.5 ± 5.8 (45–69)

57.9 ± 5.5 (45–68)

KSFS

50.2 ± 5.6 (35–60)

51.6 ± 5.9 (40–60)

FBRE group (before surgery)

n = 93

n = 78

HKA angle (degrees)

167.3 ± 8.2 (153.2–190.5)

165.9 ± 7.8 (151.4–183.8)

Knee flexion (degrees)

128.6 ± 13.3 (100–158)

130.2 ± 13.5 (94–155)

KSKS

57 ± 5.1 (44–66)

57.6 ± 5.2 (46–68)

KSFS

50.2 ± 5.6 (35–60)

51.6 ± 5.9 (40–60)

FBRD group (after surgery)

n = 93

n = 78

HKA angle (degrees)

179.4 ± 1.9 (175.1–185.6)

179.4 ± 1.5 (176.5–183)

Knee flexion (degrees)

128.9 ± 10.9 (100–154)

132.2 ± 10.1 (102–155)

KSKS

90.3 ± 4.7 (80–99)

91.1 ± 4.7 (82–99)

KSFS

91.2 ± 4.8 (80–100)

92.2 ± 4.7 (85–100)

Incidence of notching

24 (25.8%)

10 (12.8%)

Incidence of AKP

19 (20.4%)

9 (11.5%)

FBRE group (after surgery)

n = 93

n = 78

HKA angle (degrees)

179 ± 1.8 (175.2–183)

179.3 ± 1.7 (176.3–183.6)

Knee flexion (degrees)

131.7 ± 11.9 (94–157)

135.7 ± 12.2 (102–158)

KSKS

91.2 ± 4.4 (79–99)

92.3 ± 3.5 (85–99)

KSFS

91.2 ± 4.8 (80–100)

92.2 ± 4.7 (85–100)

Incidence of notching

10 (10.8%)

2 (2.7%)

Incidence of AKP

13 (14%)

6 (7.7%)