Figure 1

Record of the cartilage lesions within the knee joint. The cartilage lesions of all knees were always recorded within the same location by inspection and palpation by an arthroscopic hook. The grading was made according to the ICRS classification (range 0 to 4). Osteophytes were classified as "grade 5 lesion". Osteophytes of the trochlear grove were always found within the medial margin of the intercondylar notch (*).