Fig. 2From: Characterization of osteoarthritic human knees indicates potential sex differencesVitamin D metabolites in synovial fluid. a–d Levels of vitamin D metabolites in the synovial fluid of 10 males and 10 females undergoing total joint arthroplasty were measured using ELISA and (e) mass spectrometry. * p < 0.05 compared with maleBack to article page