There are usually three factors that cause the appearance of the calf to be thick: one is the fat hypertrophy on the back side of the calf; The other is muscular gastrocnemius on the back of calf; There is also a mixed type, that is, fat hypertrophy combined with muscular development. Generally, the hypertrophy of calf muscles is manifested by the downward flexion of ankle joint (such as the action of kicking the ground), and the posterior side of calf bulges, which highlights the outline of muscle on the skin surface, especially for those with thin subcutaneous fat, which is more obvious and lacks the feminine beauty of female calf. Some patients' legs are slightly bent, which is caused by the poor convexity of calf muscles on the inside and outside of the calf, in addition to bone factors. If it bulges excessively inward, it will appear that the calf is short and thick, giving people a heavy feeling; If it is too convex to the outside, the calf presents a curved arc, which aggravates or: a bowlegged leg. The muscles simply protrude backward, which makes the leg shape lack of beauty, which is out of proportion to the thigh.