Midterm Results of a New Rotating Hinge Knee Implant: A 5-Year Follow-Up

Table 1

Patient characteristics and differences between primary and revision group. Except where indicated otherwise, values presented are mean (standard deviation).

	Total	Primary	Revision	value
(%)	50	24 (48%)	26 (52%)
Female (%)	40 (80%)	22 (91.7%)	18 (69.2%)	p = 0.048
Age	73 (1)	74.7 (2)	72 (1.7)
Weight (kg)	82 (3)	79 (3)	85 (4)
Height (cm)	165 (1)	164 (2)	167 (2)
BMI	29.9 (0.9)	29.5 (1.1)	30.4 (1.4)
CCI	6 (0)	7 (0)	6 (0)
RA (%)	3 (6%)	2 (8.3%)	1 (3.8%)
DM (%)	12 (24.5%)	6 (26.1%)	6 (23.1%)
Hospitalization (days)	18	17 (1)	19 (1)
Indications (%)
Primary	24 (48%)	—	—
Septic loosening	10 (20%)	—	10 (38.5%)
Aseptic loosening	11 (22%)	—	11 (42.3%)
Instability	5 (10%)	—	5 (19.2%)
Complications (all)	11 (22%)	1 (4.2%)	10 (38.5%)	p = 0.003
Type 1	4 (8%)	0	4 (15.4%)
Type 2	3 (6%)	1 (4.2%)	2 (7.7%)
Type 3	4 (8%)	0	4 (15.4%)