Table 2.

Participant characteristics

	All participants (n=80)	Evidence of ACL healing on 3 month MRI
		ACLOAS grade 1 (n=40)	ACLOAS grades 2–3 (n=40)
Age at injury (SD)	26 (10)	27 (10)	26 (10)
Sex (% female)	31 (39)	14 (35)	16 (40)
Time from injury to brace (days)	8 (7)	6 (4)	8 (7)
Used private health insurance	55 (69)	27 (68)	27 (68)
Level of pre-injury sport
Recreational	28 (35)	13 (33)	15 (38)
Competitive	49 (61)	25 (63)	23 (58)
Professional	4 (5)	2 (5)	2 (5)
Contact mechanism of injury	24 (30)	17 (43)	7 (18)
History of contralateral ACL injury	8 (10)	3 (8)	5 (13)
Adherent to bracing protocol	77 (96)	37 (93)	39 (98)
PRP injection	14 (18)	5 (13)	9 (23)
Concomitant injuries*
MCL injury	40 (50)	17 (43)	23 (58)
Meniscal injury	39 (49)	21 (53)	18 (45)
PLC injury	31 (39)	20 (50)	11 (28)
Bone contusion	74 (93)	38 (95)	35 (88)
Chondral injury	1 (1)	1 (3)	0 (0)
Subcortical fracture	6 (8)	3 (8)	3 (8)
ACL rupture characteristics*
ACL femoral origin intact:	36 (45)	33 (83)	3 (8)
Displacement of ACL tissue†	17 (21)	14 (35)	2 (5)
Partial avulsion of femoral origin:	44 (55)	7 (18)	37 (93)
Displacement of ACL tissue†	33 (41)	4 (10)	29 (73)
Complete avulsion of femoral origin	0 (0)	0 (0)	0 (0)

Data are reported as mean (SD) or count (proportion).

For the two participants with missing 3-month MRI data, ACLOAS was estimated using ACLOAS from 6-month MRI (70 out of 75 (93%) participants with 6-month MRI data had the same ACLOAS at 3 months and 6 months).

*Concomitant injuries and ACL rupture characteristics were assessed by MRI within 3 weeks of acute ACL rupture.

†ACL tissue is displaced outside the boundaries of the intercondylar notch;.

ACLOAS, Anterior Cruciate Ligament OsteoArthritis Score; MCL, medial collateral ligament; PLC, posterior lateral corner; PRP, platelet rich plasma.