Your condition is “bilateral osteonecrosis of the femoral head, stage 4 on one side and stage 2 to 3 on the other. First of all, it should be clear that the purpose of conservative treatment of femoral head necrosis is to prevent the femoral head from collapsing, is the light side stage 2 or 3? Treatment is different, if it is stage 2, active treatment is needed. The heavy side is recommended for joint replacement, only in this way can the weight bearing of the light side of the femoral head be reduced to achieve the purpose of preservation, otherwise, relying on the light side for weight bearing (due to pain or functional limitation of the heavy side) will aggravate the condition. In case of stage 3, the preservation treatment is not effective and the aim of treatment is to delay the joint replacement. I suggest you to correctly understand and scientifically choose the treatment of femoral head necrosis, you can refer to the article I wrote, don’t be afraid of joint replacement surgery, good prosthesis and correct installation can prolong the use time, the key is to improve the quality of life.