The present invention relates to a test apparatus which is coupled to the tibia in advance before implanting a tibial prosthesis used for knee replacement in order to check motility of the tibial prosthesis. More specifically, the test apparatus comprises: a plate test section which is coupled to the tibia and an insert test section which is detachably coupled to the upper side of the plate test section. The plate test section includes a fixing part, and the insert test section includes a connecting part, wherein the fixing part is formed on one side of the plate test section and is coupled to the connecting part when coupling the plate test section with the insert test section so as to prevent the uncoupling of the plate test section and the insert test section, and the connecting part is formed on one side of the insert test section to press the fixing part so that the plate test section is detachably coupled with the insert test section, whereby the plate test section and the insert test section can be fixedly coupled to each other and the insert test section can be easily replaced. Accordingly, an accurate tibial prosthesis can be selected by accurately measuring the motility of the knee joint, and convenience in use can be improved.La présente invention concerne un appareil de test qui est accouplé à un tibia à lavance avant limplantation dune prothèse tibiale utilisée dans le cadre dun remplacement de genou, afin de vérifier la motilité de la prothèse tibiale. Plus précisément, lappareil de test comprend : une section de test de plaque qui est accouplée au tibia et une section de test dinsert qui est accouplée amovible à la face supérieure de la section de test de plaque. La section de test de plaque comporte une partie de fixation et la section de test dinsert comporte une partie de raccordement. La partie de fixation est formée sur une face de la section de test de plaque et est accouplée à la partie de raccordement lors de laccouplement de la section de te
