Table 1 Variables analyzed as predictors of the one-year knee injury and osteoarthritis outcome score after anterior cruciate ligament revision

Patient demographics

• Age^a (continuous variable per 10 years)

• Patient sex (male/female)

Surgery related

• Years from primary ACL reconstruction to ACL revision (continuous variable per year)

• Graft type at ACL revision (hamstring tendon, patellar tendon, quadriceps tendon, allograft, other)

 Meniscal injuries

• Any meniscal injury (yes/no)^a

• Medial meniscus injury (yes/no)^a

• Lateral meniscus injury (yes/no)^a

• Surgical treatment of any meniscal injury (yes/no)^a

• Meniscal resection of any meniscal injury (yes/no)^a

• Meniscal repair of any meniscal injury (yes/no)^a

 Cartilage injuries

• Any cartilage injury (yes/no)^a

• Highest grade on any cartilage injury (ordinal variable – ICRS 0/ICRS 1-2/ICRS 3-4)^a

• Patella (dichotomized ICRS 0-2/ICRS 3-4)^a

• Tibial plateaus (dichotomized ICRS 0-2/ICRS 3-4)^a

• Femoral condyles (dichotomized ICRS 0-2/ICRS 3-4)^a

• Trochlea (dichotomized ICRS 0-2/ICRS 3-4)^a

 Ligament injuries

• MCL (yes/no)^a

• LCL (yes/no)^a

• PCL (yes/no)^a

• PLC (yes/no)^a