Classification

Clinodactyly is classified according to the extent of the inclination, the digit involved and whether there are any associated anomalies:

• simple clinodactyly: bone deformity of middle phalanx with less than 45 degrees of angulation
• simple complicated: bone deformity of 45 to 60 degrees angulation
• complex:
  • bone and soft tissue deformity with less than 45 degrees of angulation
  • soft tissue deformity associated with syndactyly
• complex complicated:
  • bone and soft tissue deformity of 45 to 60 degrees angulation
  • associated with polydactyly or gigantism
  • may be a rotational deformity of the digit

Reference

1. Chen Y, Liu J, Zhang Z, Ding J. Hand malformations imaging characteristics and clinical classification: a case-control study. Zhonghua Yi Xue Za Zhi. 2015 May 19;95(19):1534-6.