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The common type of fracture of the patella is a simple transverse fracture due to muscular violence. Occasionally, one sees a fracture of the apex or of the superior border, which is torn away with the attached quadriceps extensor tendon. In an injury from a direct blow, one sees either simple or compound linear or comminuted fractures. Longitudinal fractures through the body of the patella have also been described, but in none of the articles on patellar fractures or in the textbooks on surgery have I come across a description or even mention of the tearing off, by trauma or otherwise, of part of the posterior articular surface of the patella. In response to an inquiry on this subject at a clinical conference of the staff of the Hospital for Ruptured and Crippled, none of the surgeons present had ever seen a similar case. I therefore concluded that the type
Kleinberg S. VERTICAL FRACTURE OF THE ARTICULAR SURFACE OF THE PATELLA. JAMA. 1923;81(14):1205–1206. doi:10.1001/jama.1923.26510140001018
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