What is the reason for pain behind the knee

If you have pain behind the knee, you should consider whether it is caused by a local popliteal cyst or a tendon problem. However, we cannot judge based solely on the symptoms of pain. Instead, we recommend going to the hospital for a comprehensive examination.

1. If you have pain in the popliteal fossa behind the knee, you may need to consider: 1. whether there is a local popliteal cyst; 2. whether there is a tendon problem; 3. whether there is a problem with the patella in front. Patellar osteomalacia may cause pain in the popliteal fossa and difficulty in squatting. If you experience pain when going up and down stairs, it is recommended that you take an X-ray first to rule out problems with the bones themselves.

2. Pain in the popliteal fossa is generally caused by strain of the popliteal muscles, aseptic inflammation, and pain caused by knee joint disease. It is recommended: It is best to go to the orthopedics department and let the doctor check in person, which is clearer. If it is a muscle disease in the popliteal fossa, you can use acupuncture, external application of plasters, local injection treatment, massage, etc. If it is a knee joint disease, it is necessary to find out the cause of the disease and treat it in a targeted manner.

3. The popliteal fossa is a diamond-shaped depression behind the knee. The upper and outer boundaries are the biceps femoris tendon, the upper and inner boundaries are mainly the semitendinosus and semimembranosus muscles, and the lower and inner and outer boundaries are the medial and lateral heads of the gastrocnemius respectively. The top (superficial surface) of the popliteal fossa is the popliteal fascia, which is the continuation of the fascia lata of the thigh and moves downward to become the deep fascia of the calf. The popliteal fascia is composed of longitudinal and transverse interwoven fibers, which are dense and tough. When suffering from popliteal cyst or popliteal artery aneurysm, there will be obvious swelling and pain due to the restriction of the popliteal fascia. The popliteal fossa floor from top to bottom includes: the popliteal surface of the femur, the posterior part of the knee joint capsule and the oblique popliteal ligament, the popliteal muscle and its fascia.

4. The tibial nerve is located at the most superficial surface of the popliteal fossa. It branches off from the sciatic nerve at the upper corner of the popliteal fossa, runs down along the midline of the popliteal fossa, passes through the soleus tendon arch at the lower edge of the popliteal muscle, and enters the posterior region of the calf. In the popliteal fossa, it sends muscular branches and articular branches to nearby muscles and the knee joint. The medial sural cutaneous nerve also arises and runs along with the small saphenous vein down to the back of the calf to join the sural nerve. The common peroneal nerve is another terminal branch of the sciatic nerve. It usually originates from the upper corner of the popliteal fossa, runs outward and downward along the medial edge of the biceps femoris tendon, crosses the surface of the lateral head of the gastrocnemius muscle, to the bottom of the fibular head, and goes around the fibular neck, where it is divided into the superficial peroneal nerve and the deep peroneal nerve. The common peroneal nerve is close to the bone surface at the fibular neck and is not covered by muscle tissue. Therefore, when the fibular neck is fractured or injured, the common peroneal nerve is easily damaged, causing paralysis of the anterior and lateral muscles of the lower leg and leading to foot drop. The common peroneal nerve gives off articular and cutaneous branches in the popliteal fossa (the peroneal nerve-communicating branch and the lateral sural cutaneous nerve).