Primary knee arthroplasty (PKA) has a long history and modern mobile bearing knee implants are successfully implanted worldwide since 1977. Primary Knee Arthroplasty focuses on basic science, personal surgical experiences, clinical, functional and radiographic outcomes of PKA, with special focus on challenging knees such as severe varus and valgus deformities with associated bone defects, fixed flexion deformities, soft tissue contractures, and arthrodesed knees. Patella treatment with or without resurfacing is addressed in great detail. Early criterion-based...