Jumper's Knee

Patellar Tendon Intact Jumper's knee

Jumper's knee results in anterior knee pain and tenderness localized to the inferior patella (kneecap). The term jumper's knee is used for adults while Sinding-Larsen-Johansson disease, a related condition or subtype of jumper's knee, is seen in active children between 10 and 14 years old.

Causes

Jumping and landing on hard surfaces. Chronic repetitive distractive forces at the patellar tendon origin from the patella produces micro-tearing and inflammation. Bone avulsions from the inferior patella, macroscopic tearing of the patella, and inflammation of Hoffa's fat pad may also occur.


Symptoms

Anterior knee pain that is worse with jumping, walking, and running.
Swelling and tenderness below the kneecap.

Diagnosis

A physical exam by a doctor is performed to evaluate for anterior pain and tenderness. X-ray may be performed to exclude a bone avulsion injury of the patella or a patellar fracture. An MRI will show partial tearing or inflammation at the posterior central origin of the patellar tendon origin and often edema in the adjacent anterior knee fat pad (i.e. Hoffa's fat pad). MRI is also helpful to rule out other injuries including chondromalacia patella, patellofemoral arthritis, patellar tracking disorders, quadriceps fat pad impingement, synovitis, and meniscus tears which could contribute to the knee pain.

Treatments

Treatment is conservative and includes rest, icing, NSAIDS, and stretching exercises.