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The Double-Patella Sign: A Patellar Implant Loosening Case Report

Maximillian P Ganz1, Angelo Mannino2, Giles R Scuderi1,2

  • 1Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York.

JBJS Case Connector
|November 2, 2023
PubMed
Summary

Even after healing, monitor patellar fractures post-total knee arthroplasty (TKA) for loosening. Inferior migration of a loose patellar component can create a "double-patella sign" on X-rays.

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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