Table 1.

OAI variables predicting knee osteoarthritis.

OAI Table	Selected Variables
Subjects	Age Gender	Ethnicity Body mass index (BMI)
Medical history	Estrogen usage Parathyroid usage Bisphosphonate usage Hip replacement Osteoarthritis Hip fracture Rheumatoid symptoms Chondroitin usage Arthritis Broken bone	Vitamin usage Pain medication usage Knee surgery Doctor diagnosed OA History of falling Spine fracture Testosterone usage Glucosamine usage Knee osteoarthritis Rheumatoid arthritis
Physical exam	Effusion Flexion pain Baseline OA symptoms Isometric strength Patellar quadriceps pain	Lateral tibiofemoral pain Medial tibiofemoral pain Patello-femoral crepitus Patellar grind/tenderness
Biomarkers	Knee replacement Baseline symptoms	Joint space narrowing Osteophyte score
Joints	Back pain KOOS symptoms score History of knee pain WOMAC total score	Activity avoidance KOOS pain score Knee pain