Abstract

Superior Dislocation of the Patella: Case Report and Literature Review

Highlights

  • A 46-year-old female presented to the emergency department (ED) with complaints of significant anterior knee discomfort, swelling and inability to ambulate or actively flex her knee

  • The initial diagnosis in the ED was a patellar tendon rupture, and a magnetic resonance image (MRI) of the right knee was performed after orthopedic consultation

  • The MRI (Figure 2) confirmed that the patellar tendon and the remainder of the extensor mechanism were intact. It demonstrated that inferior osteophytes on the patella were engaged onto osteophytes on the superior portion of the trochlear groove resulting in a locked superior patellar dislocation

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Summary

Case Report

A 46-year-old female presented to the emergency department (ED) with complaints of significant anterior knee discomfort, swelling and inability to ambulate or actively flex her knee. She reported falling at home and striking her right knee directly on a piano stool. Figure 1B: lateral X-rays taken in the emergency department (ED) demonstrating superior displacement of the patella without fracture and an unusual anterior tilt. The patient had immediate relief of her discomfort and was able to perform a straight leg raise and had nearly full active flexion after the reduction She was placed in a knee immobilizer for comfort and was discharged home. She was examined in the clinic after one week and demonstrated painless full active range of motion and has had no further squeal from this episode at 18-month follow-up

Discussion
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