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3. Shape of the intercondylar groove normally and in recurrent dislocation of the patella: A clinical and x-ray anatomical investigation;Brattström;Acta Orthop Scand [Suppl],1964
4. The patella index as a guide to the understanding and diagnosis of patellofemoral instability;Cross;Clin Orthop,1975
5. DeHaven KE, Busch MT, Panni AS, et al: Two to ten year results of lateral retinacular release. Presented at 101st Annual Meeting of the American Orthopedics Association. Homestead, Virginia, June 1988.