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Osteopenia of prematurity
Insights
Preterm infants have lower bone mineral content than full-term infants. Standard assessments like Koo score and alkaline phosphatase do not accurately diagnose bone disease in preterm infants.
Area of Science:
- Pediatrics
- Neonatology
- Bone Metabolism
Background:
- Osteopenia of prematurity is a common concern in preterm infants.
- Accurate assessment of bone mineral content is crucial for diagnosis and management.
Purpose of the Study:
- To evaluate the accuracy of commonly used methods (Koo score, alkaline phosphatase) in assessing bone mineral content in preterm infants.
- To compare bone mineral content between preterm and full-term infants.
Main Methods:
- Photon absorptiometry was used to measure forearm bone mineral content in preterm infants.
- Radiographs were assessed using Koo's method, and plasma alkaline phosphatase activity was measured.
- Bone mineral content was compared between preterm and full-term infants, adjusting for weight and ulnar length.
Main Results:
- Bone mineral content showed a weak correlation with Koo score and no significant correlation with alkaline phosphatase activity.
- Preterm infants had significantly lower bone mineral content, ulnar length, and crown-heel length compared to full-term infants.
- Even after adjusting for weight and ulnar length, preterm infants still had lower bone mineral content.
Conclusions:
- Koo score and alkaline phosphatase activity are unreliable for diagnosing bone disease in preterm infants.
- Photon absorptiometry is the most accurate method for diagnosing osteopenia of prematurity.
- Assessing bone mineral content relative to body weight or ulnar length provides a more accurate diagnosis.
Abstract:
Bone mineral content of the forearm was measured by photon absorptiometry in 17 preterm infants at a postconceptional age of 40 weeks. Radiographs of the forearm were assessed by Koo's method and plasma alkaline phosphatase activity was also measured at this time. Bone mineral content was significantly but weakly correlated with Koo score and was not significantly correlated with alkaline phosphatase activity. Neither of these two commonly used investigations accurately predicts the presence of underlying bone disease. Compared with 15 full term infants the preterm infants had significantly lower values of bone mineral content, palpated ulnar length, and crown-heel length. After adjusting for weight and ulnar length the preterm group still had a significantly lower mean value of bone mineral content than the full term group. Accurate diagnosis of osteopenia of prematurity requires photon absorptiometry, with bone mineral content assessed relative to body weight or ulnar length.