Patellar Tendonitis Home A-Z Health Information Health Library A-Z Patellar Tendonitis Overview The patellar tendon (patellar ligament) connects the knee cap (patella) to the top of the shin bone (tibia), along with the muscles at the front of the thigh. This tendon is responsible for knee extension. An injury or sprain to this tendon is known as patellar tendonitis. This condition is particularly prevalent among athletes engaged in sports that require frequent, intense physical activities; however, patellar tendonitis can also affect individuals who do not participate in sports. This disease has been reported to be more common among men than among women. Causes Intense physical activity: Such activities may stress the patellar tendon, causing this condition.Tightness in leg muscles: Tightness of the quadriceps (thigh muscles) and hamstrings can increase the strain on the patellar tendon.Muscle imbalances: Some muscles on the legs may be stronger than others, due to which the pull on the patellar tendon is uneven; this may result in patellar tendonitis.Chronic health conditions: Kidney failure, certain metabolic conditions (diabetes), and/or autoimmune conditions (such as rheumatoid arthritis) may cause the blood flow to the knee to be impaired, weaking the patellar tendon. Risk Factors Participation in professional sporting activities: These require the intense use of the knee joint (e.g., jumping, quick changes in direction, and sprinting)Risky occupations: Physically demanding professions may increase the likelihood of developing this condition.Ageing: Wear and tear of the knee joint with age may lead to this condition. Symptoms Discomfort, pain, tenderness, and swelling in the anterior (front) region of the knee, especially when climbing stairs or rising from a chair.Occasional redness around the knee joint. Diagnosis X-ray imaging: This is utilised to rule out other bone-related issues that could lead to knee pain.Ultrasound: This can help orthopaedic doctors detect tears or bruises in the patellar tendon.Magnetic resonance imaging (MRI): This can help accurately diagnose any continuity issues (such as tears in the tendon and injuries to adjacent structures). Treatment Various treatment interventions for patellar tendonitis include: Stretching routines and sports physiotherapyMuscle-strengthening exercisesUse of a patellar tendon support strapCorticosteroid injectionsPlatelet-rich plasma (PRP therapy)