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tibia, inner and larger of the two bones of the lower leg in vertebrates—the other is the fibula. In humans the tibia forms the lower half of the knee joint above and the inner protuberance of the ankle below. The upper part consists of two fairly flat-topped prominences, or condyles, that articulate with the condyles of the thighbone, or femur, above. The attachment of the ligament of the kneecap, or patella, to the tibial tuberosity...