- no trauma to target knee within last 5 years, prior viscosupplementation therapy, allergy to avian products, inflammatory disease, joint sepsis,varus/valgus >12 degrees, clinically apparent tense effusion, oral corticosteroids, intra-articular injection in any joint within the last 3 months, venous or lymphatic stasis in the leg, claudication or PVD, major surgery, arthroplasty in the target joint, arthroplasty in non-target knee within the last 6 months, current malignancy or treatment within the last 5 years, except for non-melanoma skin cancer, planned surgery during the study period, diabetes requiring insulin, use of an investigational device or drug (including glucosamine and chondroitin sulfate) within 90 days before entering the study, significant psychiatric or neurological disorder, active alcohol abuse or drug abuse within the past year.