Abstract
A 12-year-old boy fell on his flexed knee and was unable to actively extend the injured knee. Radiographs demonstrated a small osseous fragment at the superior pole of the patella and magnetic resonance imaging demonstrated the periosteal sleeve to be detached from the superior pole of the patella involving approximately three fourths of the undersurface of the quadriceps tendon footprint. This unusual variant of a patellar sleeve fracture was repaired using bioabsorbable suture anchors. Four months postoperatively, he had regained full mobility and strength of the injured knee. Prompt diagnosis aided with magnetic resonance imaging can help delineate the extent of injury. Surgical repair using a parapatellar arthrotomy without disrupting the most superficial fibers of the quadriceps mechanism is feasible and allows the patient to return to their functional activities in a short period.
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