Yi Dong Medicine and Trojan Horse Design jointly created this lower limb joint motor function parameter detector. Trojan horse design has finally generated such an excellent work that satisfies users through careful user research in the early stage, careful design research and sketch design in the middle stage. It is an all-round medical assistant, a considerate partner, and a testing instrument in the new era. The design can provide support for clinical diagnosis and treatment of orthopedics, joint surgery, sports medicine, etc., and can be used for scientific research on related joint diseases.