Obesity with radiological changes or depression was associated with worse knee outcome in general population: a cluster analysis in the Nagahama study oleh Kazuya Nigoro, Hiromu Ito, Tomotoshi Kawata, Kohei Nishitani, Yasuharu Tabara, Fumihiko Matsuda, Shu Narumiya, Shuichi Matsuda, on behalf of the Nagahama Study group