Is ulna curvature in the StW 573 (‘Little Foot’) Australopithecus natural or pathological?

Araiza, I. F. X., Meyer, M. R., & Williams, S. A. (2021). Is ulna curvature in the STW 573 (‘little foot’) australopithecus natural or pathological? Journal of Human Evolution, 151, 102927. https://doi.org/10.1016/j.jhevol.2020.102927