The knee joint is a complex and weight-bearing joint that helps you stand and walk around. A painful knee can interfere with mobility and affect the activities of daily living. Pain in the back of the knee can stem up from a large variety of causes, depending on the structure involved.
- Hamstring Strain or hamstring tendinitis-It can result from sudden intense activity or overuse involving hamstring muscle.
- Calf Strain- It is a common injury when suddenly the intensity of the training or workout is increased. Tight calf muscles, improper warm-up, and fatigue are common predisposing factors of a calf strain.
- Baker’s cyst-It is a swelling (a fluid-filled sac) on the backside of the knee along with the pain. It is usually related to meniscal injuries or arthritic changes. The synovial fluid in a sac called the bursa helps in the lubrication of the knee joint. But when injuries occur within the knee joint, this fluid amount increases and cause swelling with pain. Baker’s cyst is also known as a popliteal cyst.
- Meniscal injury-It the most common knee injury. Pain in the back of the knee results from meniscal injury when the posterior portion of the menisci is torn. Menisci act as shock absorbers of the knee joint.
- Ligament injury– Occurs due to twisting of the knee when planted on the ground. Commonly injured ligaments are ACL, MCL, and PCL.
- Osteoarthritis-Degeneration of the cartilage in the knee joint due to wear and tear and age-related changes causes osteoarthritis and pain in the knee.
- Rheumatoid Arthritis– It is an autoimmune disorder causing inflammation in the knee joint.
- Muscle cramps-It is a sudden involuntary contraction of muscle often felt as sharp pain. It is common in the calf muscle and usually results from overuse of the calf muscle, nutrient deficiency, dehydration, and nerve compression.
- Deep Vein Thrombosis(DVT)-It is a clot formation in the deep vein of the back of the leg, which can cause pain in the back of the knee. It is of concern because if the clot dislodges, it may cause a pulmonary embolism.
- Sciatica– The sciatic nerve runs from the lumbar spine to the toes through the back of the leg. The compression of the sciatic nerve in the spine causes pain, which may occur at the back of the knee.
- Injury to the common peroneal nerve and Popliteal artery entrapment syndrome can also cause pain in the back of the knee. But, these are less common causes of posterior knee pain.
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