Table 2.

Preoperative and post‐operative knee extension–flexion angle and UCLA scores. ^[Link] , ^a

Factor	ROCC (113 knees)	LCS (91 knees)	p
Preoperative knee extension angle (°) b	7.2 (8.2) [−15, 0, 5, 10, 30] c	7.8 (8.9) [0, 0, 5, 10, 30] c	0.94d
Post‐operative knee extension angle (°)	0.6 (1.9) [0, 0, 0, 0, 10] c	0.3 (1.5) [0, 0, 0, 0, 10] c	0.27d
p	<0.0001 e	<0.0001 e
Preoperative knee flexion angle (°)	120.9 (17.1) [40, 115, 125, 130, 145] c	120.5 (16.7) [45, 110, 125, 135, 145] c	0.87d
Post‐operative knee flexion angle (°)	122.9 (14.2) [65, 120, 125, 130, 150] c	125.2 (12.2) [100, 120, 125, 135, 150] c	0.50d
p	0.08e	0.006 e
Preoperative UCLA score	4.2 (1.9) [1, 2, 4, 6, 10] c	4.0 (2.0) [1, 2, 4, 5, 10] c	0.29d
Post‐operative UCLA score	5.0 (1.9) [1, 4, 6, 10] c	5.0 (2.0) [1, 4, 6, 10] c	0.56d
p	<0.0001 e	<0.0001 e

Note: p Values <0.05 are in bold.

Abbreviations: BMI, body mass index; LCS, low contact stress; ROCC, rotating concave–convex; UCLA, University of California‐Los Angeles.

^a Continuous variables are means (standard deviation) for normally distributed data and means (standard deviation) [minimum, 25th percentile, median, 75th percentile, maximum] for non‐normally distributed data.

^b The extension angle is expressed as negative for hyperextension.

^c Non‐normally distributed data.

^d Mann–Whitney U test.

^e Wilcoxon signed‐rank test.