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Growth arrest lines and recurrent patellar dislocation: a new sign
1Princess Margaret Rose Orthopaedic Hospital, Frogston Road West, Edinburgh EH 10 7ED, Scotland, UK.
The Knee
|May 5, 2001
Summary
Growth arrest lines, typically seen in long bones, were identified on patellar radiographs in adolescents with recurrent dislocations. This suggests repeated dislocations disrupt normal patellar maturation.
Area of Science:
- Orthopedics
- Radiology
- Pediatric Bone Development
Background:
- Growth arrest lines are radiologic markers of temporary cessation of bone growth, commonly observed at the metaphysis of long bones.
- Recurrent patellar dislocation is a significant orthopedic concern in adolescents, often associated with various radiological findings.
Observation:
- A novel radiological sign, patellar growth arrest lines, was observed on skyline radiographs in two adolescent patients experiencing recurrent patellar dislocations.
- The patellar shape during peak symptoms closely mirrored the subsequent growth arrest line's outline.
Findings:
- The study identified patellar growth arrest lines as a previously undescribed radiological sign associated with recurrent patellar dislocations in adolescents.
- These lines appear to result from repeated dislocations adversely impacting normal patellar maturation and ossification.
Implications:
- Patellar growth arrest lines may serve as a diagnostic indicator of prior patellar instability and trauma in adolescents.
- Resolution of symptoms and stabilization of the patella correlate with resumed ossification and improved bone density, leaving these telltale lines.