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June 12, 1967

Interarticular Dislocation of the Patella

Author Affiliations

From the Department of Orthopaedics, Mercy Hospital, Watertown, NY.

JAMA. 1967;200(11):996. doi:10.1001/jama.1967.03120240124033

DISLOCATION of the patella into the interarticular space is apparently rare, but as so often the case, optimum treatment depends upon one's awareness of this injury.

Brady and Russell,1 in a recent review of the literature, were able to collect 25 cases. To this group they added one of their own, and concluded that closed manipulation was rarely, if ever, successful. They advised prompt open reduction. The following case report supports this contention.

Report of a Case  A 12-year-old white boy was struck by a car while riding his bicycle on the evening of Aug 30, 1963. He sustained injury to his left shoulder and his right knee. He was taken to a nearby hospital where roentgenographic examination revealed an undisplaced fracture of the surgical neck of the right humerus and an interarticular dislocation of the right knee (Figure). These x-ray films showed the patella rotated 90° about its