The study was concerned with verification of the selection of referencepoints used for knee joint mobility range goniometry. The verification was based on photometric and electrogoniometricmethods of femorotibial angle measurements. The material for measurements were three knee joint preparations.The obtained data were subjected to descriptive analysis; photographic documentation of geometric relationsbetween the reference points was also prepared. Considerable divergence of measurement results was observedwith respect to the actual knee joint flexion angle, amounting even to 16 degrees. The differences aredue to the selection of anatomic landmarks, and depend in particular on the distance of the point towhich the goniometer axis is applied from the approximate location of the mechanical joint axis. Thecorrections of knee joint flexion angle measurements were also estimated on the basis of data obtainedfrom the photographs and the derived mathematical formula.

Keywords: goniometry, electrogoniometry, Knee Joint