This angle is measured by drawing a line along the long axis of the tibia, creating a perpendicular to this line, and drawing another line through axial plane of the proximal tibial metaphysis. The angle created between the perpendicular line shown and the metaphyseal line is the metaphyseal diaphyseal angle.
It is abnormal if >11o, indicating Blount disease.
- 1- Levine AM, Drennan JC. Physiological bowing and tibia vara. The metaphyseal-diaphyseal angle in the measurement of bowleg deformities. J Bone Joint Surg Am. 1982;64 (8): 1158-63. Pubmed citation
- 2- Cheema JI, Grissom LE, Harcke HT. Radiographic characteristics of lower-extremity bowing in children. Radiographics. 2003;23 (4): 871-80. Radiographics (full text) - doi:10.1148/rg.234025149 - Pubmed citation