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Related Experiment Videos

Computerised tomography in non-treated congenital hip dislocation.

J N Ligier1, J Prévot, P Lascombes

  • 1Clinique Chirurgicale Infantile Orthopédique, Hôpital d'Enfants de Nancy, Vandoeuvre les Nancy.

Zeitschrift Fur Kinderchirurgie : Organ Der Deutschen, Der Schweizerischen Und Der Osterreichischen Gesellschaft Fur Kinderchirurgie = Surgery in Infancy and Childhood
|June 1, 1988
PubMed
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Computerised tomography reveals congenital hip dislocation allows significant femoral head movement. Hip flexion aids in locating the femoral head posterior to the acetabulum, facilitating reduction.

Area of Science:

  • Orthopedics
  • Radiology
  • Pediatric Surgery

Background:

  • Congenital dislocation of the hip (CDH) is a condition requiring accurate diagnosis and understanding of hip joint mechanics.
  • Conventional imaging may not fully elucidate the dynamic positional changes of the femoral head in CDH.

Purpose of the Study:

  • To investigate the positional dynamics of the femoral head in non-treated congenital dislocation of the hip using computerised tomography.
  • To assess the influence of hip flexion and extension on femoral head positioning relative to the acetabulum.

Main Methods:

  • Computerised tomography (CT) scans were performed on five untreated cases of congenital dislocation of the hip.
  • The position of the femoral head was analyzed in both extended and flexed (90 degrees) hip positions.

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Main Results:

  • The femoral head demonstrated significant anteroposterior mobility within a large cavity.
  • In hip extension, the dislocated femoral head was typically located superolateral and slightly anterior to the acetabulum.
  • In hip flexion, the femoral head shifted to a position posterior and slightly superior to the acetabulum, with a palpable "click" during reduction.

Conclusions:

  • Computerised tomography provides valuable insights into the dynamic instability of the femoral head in congenital hip dislocation.
  • Hip flexion is a critical maneuver for both assessing and potentially reducing congenital hip dislocations, indicated by a distinct "click."
  • Understanding these positional changes is crucial for effective management of congenital hip dislocation.