Table 4.

 Radiographic osteoarthritis of index knee at five years as graded by Osteoarthritis Research International atlas.^18,19 Values are numbers (percentages) unless stated otherwise

Five year follow-up	Full analysis set				As treated groups
	Early ACL reconstruction (n=58)	Delayed optional ACL reconstruction (n=55)	P value		Early ACL reconstruction (n=58)	Delayed ACL reconstruction (n=29)	Rehabilitation alone (n=26)	P value
Tibiofemoral compartment*
Radiographic osteoarthritis†	9 (16)	4 (7)	0.17		9 (16)	1 (3)	3 (12)	0.25
Medial compartment‡:	6	3			6	1	2
JSN grade ≥2	—	—
Osteophytes grade ≥2	6	2			6	1	1
JSN ≥1 and osteophytes ≥1	—	1					1
Lateral compartment‡:	6	1				—	1
JSN grade ≥2	—	—
Osteophytes grade ≥2	5	1			5		1
JSN ≥1 and osteophytes ≥1	2	—			2
Patellofemoral compartment*
Radiographic osteoarthritis†:	14 (24)	8 (15)	0.20		14 (24)	6 (21)	2 (8)	0.21
Osteophytes grade ≥2	14	8			14	6	2

ACL=anterior cruciate ligament; JSN=joint space narrowing.

Osteophyte and JSN grading was performed according to Osteoarthritis Research International atlas (0-3, best to worst).^{18, 19}

*Four knees in rehabilitation and early ACL reconstruction group and two knees in rehabilitation plus delayed ACL reconstruction group (1 delayed ACL reconstruction and 1 rehabilitation alone) had both femorotibial and patellofemoral radiographic osteoarthritis.

†Radiographic osteoarthritis of tibiofemoral compartment was considered to be present if JSN grade ≥2, and/or sum of two marginal osteophyte grades from same compartment ≥2, and/or grade 1 JSN in combination with grade 1 osteophytes in same compartment; radiographic osteoarthritis of patellofemoral compartment was considered to be present if sum of two marginal osteophyte grades was ≥2.

‡Three knees in rehabilitation and early ACL reconstruction group had both medial and lateral compartment radiographic osteoarthritis.