limb joint molecular composition trait knee joint molecular composition trait Trait.ontology VT:0011051 caripark 2023-07-12T20:22:10Z Any measurable or observable characteristic related to the proportions of proteins, minerals, nutrients, gases, or other substances in the joint that joins the thigh with the leg and consists of two articulations: one between the femur and tibia, and one between the femur and patella.