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-upFull analysis setAs treated groups
Early ACL reconstruction
(n=58)
Delayed optional ACL reconstruction
(n=55)
P valueEarly ACL reconstruction
(n=58)
Delayed ACL reconstruction
(n=29)
Rehabilitation alone
(n=26)
P value
Tibiofemoral compartment*
Radiographic osteoarthritis†9 (16)4 (7)0.179 (16)1 (3)3 (12)0.25
Medial compartment‡:63612
 JSN grade ≥2
 Osteophytes grade ≥262611
 JSN ≥1 and osteophytes ≥111
Lateral compartment‡:611
 JSN grade ≥2
 Osteophytes grade ≥25151
 JSN ≥1 and osteophytes ≥122
Patellofemoral compartment*
Radiographic osteoarthritis†:14 (24)8 (15)0.2014 (24)6 (21)2 (8)0.21
 Osteophytes grade ≥21481462

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.