Table 2.

Outcome measurements compared between the PFC Sigma and ATTUNE systems at baseline, and at the 3-month, 1-year, and 5-year postoperative follow-ups

Outcome measurement	PFC Sigma (N = 59)* Mean ± SD	ATTUNE (N = 54)* Mean ± SD	p-value
Timed up and go test
Baseline (n = 59/54)**	21.5 ± 10.9	23.9 ± 14.8	0.425
3 months (n = 55/53)**	17.3 ± 7.2	19.4 ± 9.2	0.276
1 year (n = 55/47)**	14.3 ± 5.6	15.6 ± 5.6	0.322
5 years (n = 41/39)**	16.9 ± 9.9	16.8 ± 5.6	0.949
Two-minute walk test
Baseline (n = 59/54)**	45.8 ± 21.5	45.3 ± 18.5	0.919
3 months (n = 55/53)**	60.4 ± 20.7	55.6 ± 18.2	0.293
1 year (n = 55/47)**	69.4 ± 19.0	63.8 ± 15.6	0.164
5 years (n = 41/39)**	64.1 ± 21.5	62.5 ± 16.2	0.709
Numerical rating scale-pain
Baseline (n = 59/54)**	7.4 ± 1.9	7.7 ± 1.6	0.447
3 months (n = 56/54)**	1.6 ± 1.3	1.5 ± 0.9	0.560
1 year (n = 56/51)**	0.8 ± 1.2	0.6 ± 0.7	0.561
5 years (n = 44/41)**	0.3 ± 0.6	0.4 ± 0.8	0.734
Range of motion (degrees)
Baseline (n = 59/54)**	102.0 ± 21.6	98.9 ± 13.6	0.522
3 months (n = 55/53)**	105.7 ± 11.2	105.3 ± 7.6	0.855
1 year (n = 55/50)**	106.5 ± 10.3	109.6 ± 7.9	0.203
5 years (n = 55/50)**	110.0 ± 10.8	115.8 ± 9.9	0.041
Modified knee score
Baseline (n = 59/54)**	44.9 ± 11.3	45.2 ± 10.5	0.884
3 months (n = 57/54)**	87.2 ± 6.5	87.5 ± 4.1	0.761
1 year (n = 56/51)**	90.9 ± 7.9	91.4 ± 6.1	0.696
5 years (n = 55/53)**	93.8 ± 6.4	95.0 ± 4.2	0.276

*N indicates the total number of patients before surgery in each group

**(n/n) indicates the number of patients at each follow-up time point in the PFC Sigma and ATTUNE groups, respectively

Student’s unpaired t-test was used to compare differences in each outcome between the PFC Sigma and ATTUNE systems at each follow-up time point

A p-value< 0.05 indicates statistical significance

Abbreviation: PFC, Press Fit Condylar; SD, standard deviation