The scientific name of O-leg is genu varus, and its main change is that the thigh and calf bones form an abnormal internal rotation angle at the knee joint. Because the calf bone rotates inward, when the feet are together and upright, the knees can't be together, forming an ugly gap. It is not necessarily that the bones of the calf are bent.

The calf can bend backward, but it can also move sideways at a certain angle. This angle is determined by ligament and joint capsule, and ligament has great plasticity. So that the O-leg can be corrected.

The correction of O-leg is to change the included angle of internal rotation back, so that the calf bone rotates outward at the knee joint position, so that the leg looks straighter and bid farewell to the troubles of O-leg.

The medial and lateral angles of the knee joint are different from the anterior and posterior angles, and are not actively controlled by the leg muscles, but determined by the strength of the medial and lateral ligaments of the knee joint. The medial and lateral collateral ligament of the knee joint is the main stable structure of the medial and lateral knee joint. When the lateral ligament is relaxed, the knee joint will rotate inward to form an O-shaped leg.

Shanghai Kangzheng Instrument Co., Ltd. is a private joint-stock high-tech enterprise registered in Zhangjiang High-tech Park, Pudong New Area, Shanghai.

Shanghai Kangzheng Instrument Co., Ltd. is the pioneer of the domestic O-leg correction electronic instrument market, and also the inventor and trademark holder of Zhengo Instrument, the only electronic instrument that can effectively correct O-legs in China.

Shanghai Kangzheng Instrument Co., Ltd. is a pioneer and leader in the O-leg orthosis market, and is committed to the research, development, production and sales of O-leg orthosis to help friends with O-leg problems have a more perfect life.

In 2006, Shanghai Kangzheng Instrument Co., Ltd. began to build a model market in Henan. The first direct store was established in Wenhua Road, Zhengzhou City, announcing the official listing of Zhengao Instruments.

Zhengyi Zhengzhou Store is located in the most prosperous Erqi business district in Zhengzhou, facing the Henan Provincial Gymnasium, with convenient transportation. In the store, customers can try it out for free and experience the effect of correcting O-legs with positive O-leg beauty instrument.

In June, 2007, the company released the mail order and increased the intensity of e-commerce, which will speed up the channel layout of the company and make consumers all over the country have the opportunity to buy the instrument.

In 2008, Shanghai Kangzheng determined the channel strategy of "1 1 Road Leg Training Workshop", and at the same time built the first O-shaped leg orthosis product brand in China, as well as the exclusive channel brand of leg training products. The sales channel will focus on its own product, Zhengo leg beauty instrument, and at the same time sell all kinds of leg beauty products to better and comprehensively meet the needs of consumers.

20111October, Zhengzhou Branch of Shanghai Kangzheng Instrument Co., Ltd. moved to No.26 Nongke Road.