A comparative study of flat surface design and medial pivot design in posterior cruciate-retaining total knee arthroplasty: a matched pair cohort study of two years

Table 1 Patient characteristics in the Hi-Tech Knee II and FINE Knee groups

	Hi-Tech Knee II (n = 45)	FINE Knee (n = 45)	p values
Gender (male:female)	7:38	7:38	1.000^a
Age, years	74.1 (8.1)	74.3 (10.3)	0.351^b
Diagnosis (OA:RA)	38:7	30:15	0.846^a
Height, cm	149.5 (8.6)	147.8(7.2)	0.015^b
Weight, kg	60.3 (9.5)	55.7(8.4)	0.035^b
BMI	25.8 (3.1)	25.6 (3.7)	0.566^b
Surgical approach (Mid-vastus: Medial parapatellar)	29:16	41:4	0.005^a
Preoperative knee score^c	64.6 (12.0)	55.1 (14.3)	0.006^b
Preoperative functional score^c	45.6 (16.9)	33.3 (21.1)	0.013^b
Preoperative total ROM, degrees	104 (23)	104 (23)	0.961^b
Preoperative maximum flexion, degrees	114 (17)	116 (19)	0.436^b
Preoperative flexion contracture, degrees	11 (10)	13 (10)	0.226^b
Preoperative FTA, degrees	183.7 (6.8)	181.3 (5.2)	0.069^b

Mean (standard deviation)
^aFisher’s exact probability test
^bWilcoxon signed rank test, ^cKnee Society score
OA osteoarthritis, RA rheumatoid arthritis, BMI body mass index, ROM range of motion, FTA femoro-tibial angle

ISSN: 1471-2474