Sports activities before and after medial unicompartmental knee arthroplasty using the new Heidelberg Sports Activity Score - Jahnke, Alexander; Mende, Johannes Karl; Maier, Gerrit Steffen; Ahmed, Gafar Adam Gafar; Ishaque, Bernd-Alexander; Schmitt, Holger; Rickert, Markus; Clarius, Michael; Seeger, Jörn Bengt (International orthopaedics, 2015)