Above-knee prosthetic limbs comprise several components including the artificial foot, ankle joint, lower leg, knee joint, socket, and suspension device. Due to their complex structure, various components such as the socket, knee joint, and ankle joint can be diversified, resulting in a wide range of prosthetic options.

Modular limb prostheses adopt a skeletal structure, utilizing standardized components such as joints, connectors, and support elements to construct the internal framework. Additionally, external decorations like soft padding and knit stockings enhance the prosthesis's realism. As advancements are made in knee joint components and other components towards achieving multifunctionality, increased strength, and lighter weight design, prosthetic performance undergoes significant enhancement.
 
Prosthetic knee joints are primarily categorized as mechanical, pneumatic, or hydraulic, allowing patients to flexibly choose products that suit their individual needs.