The utility model purpose provides a kind of knee-pad recorded and analyze knee joint bending state in what. Its technological means includes: a knee-pad, a location transmitters, a first transmitter, a second transmitter, a recipient and a default software； The location transmitters are arranged in the knee-pad middle, which is arranged at the above position of the what location transmitters, which is arranged at what location transmitters or less position. This creation can not only allow user to note knee angle of bend, the rehabilitation tracking of the inspection and judgement and art Hou that can more use what preoperative and keyholed back plate.本新型目的在於提供一種記錄及分析膝關節彎曲狀態之護膝。其技術手段包括：一護膝、一定位發射器、一第一發射器、一第二發射器、一接受器及一預設軟體；該護膝中間處設置該定位發射器，該第一發射器設置於該定位發射器以上位置處，該第二發射器設置於該定位發射器以下位置處。本創作不但能讓使用者悉知膝蓋彎曲角度，更可用於術前的檢查及判斷和術後的復健追蹤及控管。
