The knees are the biggest joints and include quite a lot of shifting components. They take part in countless each day actions: strolling, climbing stairs, tying footwear, choosing one thing up off the ground, or sitting with the legs crossed.With all these functions, it is not shocking that these giant, advanced joints are vulnerable to damage. Though knee ache is quite common, many individuals affiliate ache with the entrance of the joint. Ache behind the knee, or posterior knee ache, impacts many individuals as properly.
1. Knee Joint Construction
The knee joint is classed as a modified hinge joint, and it interacts with three bones: the tibia, patella, and femur. An intricate network of cartilage disks, ligaments, tendons, and muscles
work collectively to offer structural assist and permit movement.The traditional vary of movement for knee joints consists of extension and flexion, that are demonstrated once we bend and straighten our legs. Knee joints are additionally in a position to rotate barely. Synovial fluid, a transparent, viscous, liquid inside the joint, acts as a lubricant and cushion throughout these motions.
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2. PCL Harm
The posterior cruciate ligament or PCL helps preserve bones of their correct positions and lets the knee transfer easily. This ligament is situated behind the knee and connects the decrease leg bone to the thighbone. Anybody can expertise a PCL damage, nevertheless it's commonest amongst athletes and skiers.Potential causes of a PCL injury include
hitting the knee towards a tough floor, touchdown fallacious after a bounce, falling on a bent knee, dislocating the knee joint, or bending the knee too far backwards.
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3. Biceps Femoris Tendinopathy
The biceps femoris tendon behind the knee types a part of the hamstring muscle group, serving to management decrease leg motion on the knee. Tendinopathy happens when forceful or repetitive use of the tendon results in tiny tears
and irritation. Causes embrace strolling or working uphill, prolonged durations of sitting or driving, or a sudden enhance in a strolling or working train routine.
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4. Popliteal Tendonitis
The popliteus is a small muscle situated behind the knee, and the popliteal tendon runs from the thigh to
the decrease leg. This triangular muscle and its related tendon assist the knee bend.Popliteal tendonitis is related to athletic actions corresponding to downhill snowboarding or working, particularly working on hills or uneven terrain. It will possibly additionally happen if the knee is hyperextended whereas climbing stairs or strolling uphill. Ache tends to worsen throughout actions that bend or straighten the knee.
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5. Referred Ache
Typically ache behind the knee is definitely referred ache that is not from the knee in any respect. Sciatica happens when pain from a compressed nerve in the lower back
— the sciatic nerve — radiates alongside its size.Folks can expertise sciatic ache within the again, buttocks, and hips, and alongside the again of the legs and knees. As much as 40% of adults expertise sciatic ache sooner or later of their lives, although it is commonest after age 50.
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Arthritis is a typical explanation for swelling, stiffness, and pain behind the knees
. Osteoarthritis slowly wears away the cartilage between bones within the knee joint and will trigger bone spurs.Submit-traumatic arthritis happens after an damage damages the knee or displaces cartilage. Rheumatoid arthritis is an autoimmune illness that triggers an inflammatory response inside joints that slowly wears away cartilage and causes swelling of the synovial membranes.
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7. Gastrocnemius Tendinopathy
Gastrocnemius tendinopathy refers to an injury of the gastrocnemius tendon running from the back of the knee
to the massive calf muscle. The tendon could grow to be infected or expertise degeneration as a consequence of overuse. Sudden onset of ache is probably going as a consequence of irritation whereas step by step rising ache and stiffness could point out degeneration.Contributing components embrace excessive depth sprinting, muscle imbalances within the hip and knee joints, poorly fitted or worn-out footwear, or an abrupt enhance in working depth or distance.
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Chondromalacia patella, additionally referred to as runner's knee, happens when cartilage under the kneecap becomes soft
and breaks down.The patella, or kneecap, is roofed by cartilage that ought to glide easily. Cartilage deteriorates if parts of the knee joint aren't shifting correctly and let the kneecap rub towards bone. Causes embrace poor knee alignment, weak thigh muscle mass, a earlier dislocation or damage, or repetitive stress from snowboarding, working, or leaping.
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9. Baker's Cyst
A Baker's cyst, additionally referred to as a popliteal cyst, happens when the knee joint produces an excessive amount of synovial fluid. This may occur when bone or cartilage across the knee is broken by arthritis or an damage. The fluid-filled cyst could trigger swelling and a noticeable bulge, along with a tight feeling
behind the knee. The ache could worsen when the knee is prolonged.
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10. Deep Vein Thrombosis
A deep vein thrombosis or DVT
is a blood clot in a deep vein, often in a calf or thigh muscle. Clots can type when a vein is broken or the blood circulation inside a vein stops or slows down.Signs embrace soreness in calf or thigh muscle mass, ache behind the knee, and swelling, heat, and redness over the clot. Contact a health care provider instantly should you suspect a DVT.