. Author manuscript; available in PMC: 2019 May 7.

Published in final edited form as: Am J Sports Med. 2013 Mar 4;41(4):769–778. doi: 10.1177/0363546513477838

TABLE 3.

Baseline Side-to-Side Differences (mm)^a

	Control Group (n = 32)	ACL Group (n = 38)
Medial compartment
Mean ± SD	0 ± 0.36	0.10 ± 0.58
Median (25%, 75%)	0.02 (−0.20, 0.27)	0.05 (−0.33, 0.43)
Lateral compartment
Mean ± SD	−0.01 ± 0.51	−0.32^b 6 0.62
Median (25%, 75%)	0.10 (−0.38, 0.29)	−0.10 (−0.50, 0.02)

Joint space width (JSW) in the anterior cruciate ligament (ACL)–injured group calculated as injured knee minus normal knee. Half of the JSW difference in the control group was the difference between right minus left knees, while the other half was left minus right knees (determined by randomization).

The ACL-injured knees were found to have a significantly different JSW (P = .005).