The recovery time for a broken skin knee depends on the degree and size of the broken skin and whether the wound is infected, which may be 1 week or 2-3 months. If the skin of the knee is broken to a lesser extent, the skin is broken to a smaller extent, the wound is not infected, and the patient has a strong self-healing ability, the broken skin can generally crust over and heal in 5-7 days; if the skin is broken to a larger extent and to a greater extent, the recovery time can be extended to about 10 days; if it is accompanied by infection, forming redness, swelling, pain, and pus manifestations, the healing may take 2 weeks or even longer; and if the patient’s knee fall with muscle or ligament or joint damage, recovery may take 2-3 months. After a scraped and broken knee, patients should prevent bacterial infection, prevent tetanus infection, and walk less to avoid wound dehiscence and prolong healing time. In case of severe infection, pus in the wound, etc., prompt surgical consultation is required to avoid more serious complications.