Home | Knee Arthritis | Alzheimers Care | Alzheimers Booklet | Living With Alzheimers | A Kit | Normal Aging? Knee Arthritis (gonarthrosis) What is arthritis (arthrosis)? It is the wearing out of the cartilage that lines the ends of the tibia and femur within the knee joint. Knee Arthritis (gonarthrosis) Dr. Vincent Chassaing tibial arthritis (2), involving the outer aspect of the knee. - Patello-femoral arthritis (3), involving the knee cap. Arthritis of the knee is most often osteoarthritis, a degenerative disease where cartilage in the joint gradually wears away. A common symptom is morning stiffness that lessens after moving around. What Are the Signs of Knee Arthritis and How Is It Diagnosed Home | Knee Arthritis | Alzheimers Care | Alzheimers Booklet | Living With Alzheimers | A Kit | Normal Aging? Home | Knee Arthritis | Alzheimers Care | Alzheimers Booklet | Living With Alzheimers | A Kit | Normal Aging? Arthritis of the Knee. Three basic types of arthritis may affect the knee joint. 1. Osteoarthritis (OA) is the most common form of knee arthritis.