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Physiologic bowing of the legs in infants typically resolves naturally. Differentiating this from structural tibia varum or bone disorders is key for appropriate management.
Area of Science:
- Orthopedics
- Pediatric Medicine
- Developmental Biology
Background:
- Bowed appearance of lower extremities is common in infants starting to walk.
- Often due to internal tibial rotation relative to the femur, termed physiologic bowing.
- This condition usually self-resolves with growth and maturation.
Purpose of the Study:
- To differentiate between physiologic bowing and structural deformities in children.
- To identify conditions requiring intervention versus those needing only reassurance.
- To guide evaluation of bowed lower extremities in pediatric patients.
Main Methods:
- Clinical observation of lower extremity alignment during ambulation.
- Assessment of tibial rotation and femoral relationship.
- Evaluation for signs of tibia varum or underlying bone disorders.
Main Results:
- Physiologic bowing is common and typically benign, resolving spontaneously.
- Tibia varum represents a structural growth arrest requiring further evaluation.
- Systemic bone disorders can cause true bowing due to weight-bearing effects.
Conclusions:
- Accurate diagnosis is crucial to distinguish self-resolving conditions from those needing intervention.
- Early identification of tibia varum or bone disorders ensures timely management.
- Reassurance is appropriate for parents of infants with physiologic bowing.
Abstract:
The bowed appearance of the lower extremities is most often caused by internal rotation of the tibia in relationship to the femur. It is most commonly seen as the infant commences ambulation. This so-called physiologic bowing usually spontaneously resolves with growth and the maturity of the lower extremities. In older children, tibia varum may occur, in which there is a local arrest of growth on the posterior medial aspect of the tibia producing a true structural angulation. In certain long-standing metabolic or genetic bone disorders, the effects of weight bearing produce a true bowing of the extremities with changes about the hips, knees, and ankles. The most important aspect in the evaluation of a child with a bowed appearance of the lower extremities is to determine which conditions require aggressive treatment and which ones require simply giving the parents reassurance that the condition will spontaneously regress.