The extensive literature on arthrography of the knee attests to the fact that lesions of the menisci and ligaments are frequently combined. The investigation by LINDBLOM (1948) was based on examinations performed during the period 1940-44 and STENSTROM (1968) published a report on combined clinical and radiologic findings in arthrography of the knee in children based on multiple discriminant analysis. An attempt has been made to investigate the underlying traumatic mechanism and to classify combined ligament and meniscus lesions from the roentgenographic appearances alone. The computerized statistical evaluations have for reasons of comparison been applied to a complete series of 2 836 arthrographies of the knee performed during the five-year period 1965-69. The investigations of the isolated and combined lesions of the same case material will be described in a paper to follow.
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