You can only walk on the ground about 6 weeks after the knee bone crack, if the symptoms are more serious or your own recovery function is poor, the time should be extended appropriately, which can be determined according to the review results. Knee bone fracture is usually caused by trauma, and clinically, it mostly manifests as pain in the knee area, localized swelling, inability to bear weight, and percussion pain. 1. Mild injury: If there is no obvious dislocation in minor bone fracture, it can be gradually recovered by rest and braking for 6 weeks, and can be fixed by wearing a brace or playing a plaster. If the fracture heals well, the cast can be removed for normal activities. 2. Moderate injury: knee fracture with dislocation, need for surgical treatment, can take the steel pin, tension band wire internal fixation and other methods of treatment, usually need more than 6 weeks to gradually heal. 3. Severe injury: If there is a serious comminuted fracture of the tibial plateau or femoral condyle, it may take 3 to 4 months or even longer to recover.