How long it takes to recover from patellar bone marrow edema is closely related to the condition and the treatment method, usually caused by excessive activity or patellar trauma, and it takes about 4-6 weeks to recover from patellar bone marrow edema caused by excessive activity, during which time strict braking is required, try not to move, and at the same time use blood-stasis-activating drugs, such as blood-activating and pain-relieving capsules, etc., while daily hot compresses can be applied to help improve the local The blood circulation can be improved by applying hot compresses daily. In general, recovery from trauma-induced patellar bone marrow edema is more difficult and takes longer, about 2-3 months, or even longer. During this period, it is necessary to brake as much as possible, together with the above-mentioned medication, and physical therapy, such as microwave physiotherapy and shock wave therapy, is also recommended, and the specific recovery time needs to be determined according to the condition.