II. Definitions
- Bone Age
- Growth Assessment tool in the evaluation of abnormal growth
III. Physiology
- Bone Age is estimated by ossification patterns
- Software tools are available that estimate Bone Age by xray, as well as MRI, Ultrasound and DEXA
IV. Precautions
- XRay Bone Age models are based on development of white children
- May be inaccurate in non-white ethnicities
V. Indications
VI. Technique
- Age under 2 years
- Knee XRay (Anteroposterior and lateral)
- Hand XRay (Anteroposterior and Lateral)
- Age over 2 years
- Left hand or non-dominant side (anteroposterior)
- Left wrist or non-dominant side (anteroposterior)
VII. Interpretation
- Bone Age 2 SD above or below Chronological age suggests a pathological condition
- Delayed Bone Age and Short Stature
- Normal Bone Age and Short Stature
- Familial Short Stature
- Idiopathic Short Stature