An efficient Riemannian statistical shape model using differential coordinates: With application to the classification of data from the Osteoarthritis Initiative.

•Novel Riemannian framework for statistical shape analysis that is able to account for the nonlinearity in shape variation.•Lie group structure with closed-form expressions guaranteeing numerical efficiency.•Results on the open-access OAI and FAUST datasets demonstrate superior performance over state-of-the-art.