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UK Orthopaedics
Health Information
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Sinding - Larsen - Johansson Syndrome
From Miller MD, Cooper DE, Warner JJP: Review of Sports Medicine
and Arthroscopy. Philadelphia, WB Saunders, 1995, p. 61.
Description
Sinding-Larsen-Johansson syndrome is inflammation of the kneecap (patella) at
its lowest point. This is the site of origin of the patellar tendon. There is
traction on the kneecap at this point due to action of the large, powerful thigh
muscle (quadriceps), as well as with deep bending of the knee. The injury is due
to repeated stress or vigorous exercise. It is a temporary condition of the
patella that is uncommon after age 16. It is the children’s equivalent of patellar tendinitis (jumper’s knee).
Common Signs and Symptoms
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Slightly swollen, warm, and tender bump below the kneecap
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Pain with activity, especially when straightening the leg against force (such as with stair climbing, jumping, deep knee bends, or weightlifting) or following an extended period of vigorous exercise in an adolescent
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In more severe cases, pain during less vigorous activity
Treatment Considerations
Initial treatment consists of ice to relieve pain, stretching and strengthening
exercises, and modification of activities. Specifically, kneeling, jumping,
squatting, stair climbing, and running on the affected knee should be avoided.
The exercises can all be carried out at home for acute cases. Chronic cases
often require a referral to a physical therapist or athletic trainer for further
evaluation or treatment. A patellar band (brace between the kneecap and tibial tubercle on top of the patellar tendon) may help relieve symptoms.
 More on jumper's knee
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