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[Eccentric ossification of the femur head epiphysis in hip dislocation; consequences for diagnosis and therapy]
Insights
Eccentric ossification of the upper femoral epiphysis in infants with hip dislocation is a normal process. Understanding this phenomenon is crucial for accurate diagnosis and treatment, avoiding misinterpretations of femoral head position.
Area of Science:
- Pediatric Orthopedics
- Developmental Biology
- Biomechanical Engineering
Context:
- Ossification of the upper femoral epiphysis follows biomechanical principles.
- In infants with hip dislocation, altered biomechanics lead to eccentric nucleus development.
- This eccentric ossification is a physiological adaptation, not epiphysis necrosis.
Purpose:
- To highlight the importance of eccentric ossification of the upper femoral epiphysis in infants with hip dislocation.
- To differentiate physiological eccentric ossification from epiphysis necrosis.
- To emphasize the role of appropriate radiographic techniques in diagnosing hip conditions.
Summary:
- The osseous nucleus in normal infant hips develops centrally.
- In hip dislocation, altered biomechanics cause lateral and cranial nucleus positioning.
- Post-reduction, the nucleus may bifurcate or extend caudally, both normal processes.
Impact:
- Misunderstanding eccentric ossification can lead to misdiagnosis of femoral head position.
- Inappropriate X-ray techniques can exacerbate diagnostic errors.
- Awareness of eccentric ossification and proper imaging are vital to prevent unnecessary surgeries.
Abstract:
Ossification of the upper femoral epiphysis is dependent on biomechanical laws. In babies with normal hips, the osseous nucleus develops in the centre of the epiphysis. In babies with hip dislocation, however, the altered biomechanical factors result in a different location of the nucleus. Ossification begins in a more lateral and cranial position. After reduction of the dislocated hip, either a second nucleus forms and grows together with the first nucleus, or the eccentric nucleus extends in a caudal direction. Both of these alternatives are physiological processes and should not be confused with necrosis of the epiphysis. The eccentric development of the nucleus is hardly mentioned in the modern literature, but it is of the greatest importance for diagnosis and therapy. Ignorance of the phenomenon of eccentric ossification may lead to a false assessment of the position of the femoral head. This mistaken impression may be heightened by an inappropriate X-ray technique: only by using techniques which take into account that the middle rotation position in children is different from that in adults can mistaken diagnoses and unnecessary operations be avoided. Examples are presented.