Causes of Jumper’s Knee

Jumper's knee results from the repetitive use of the knee joint, particularly from frequent jumping on hard surfaces. This injury is often associated with sports and is related to the contraction of leg muscles and the impact of landing. Such stress places a strain on the tendon, which can lead to inflammation and degeneration over time.

Risk Factors of Jumper’s Knee

The risk factors of Jumper's knee (patellar tendinopathy) include:

• Overuse: Repetitive stress from jumping and landing can lead to microtears in the patellar tendon.

• Biomechanical Issues: Poor jumping technique, improper landing mechanics, or muscle imbalances can increase stress on the tendon.

• Muscle Imbalances and Weakness: Weakness and tightness in the surrounding musculature can result in inadequate support, increasing strain on the knee joint.

• Training Errors: Sudden increases in the intensity, frequency, or duration of training can overwhelm the tendon.

• Improper Footwear: Worn-out or unsupportive shoes can contribute to poor biomechanics and increased stress on the knee.

• Surface and Environment: Jumping on hard surfaces or uneven ground can elevate the risk of developing jumper's knee.

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Signs and Symptoms of Jumper’s Knee

Signs and symptoms of jumper's knee (patellar tendinopathy) include:

• Pain: Sharp or aching pain below the kneecap during jumping, running, or squatting.

• Swelling: Mild swelling around the knee or tendon area.

• Stiffness: Stiffness, especially after inactivity or in the morning.

• Weakness: Difficulty performing jumping or explosive movements.

• Activity-Related Pain: Discomfort that worsens with activity and improves with rest.

• Reduced Range of Motion: Difficulty fully extending the knee or discomfort during certain movements.