Sinding-Larsen-Johansson Syndrome: Causes & Treatment
Sinding-Larsen-Johansson Syndrome is a painful overuse condition at the lower pole of the kneecap in children and adolescents, commonly triggered by repetitive sports activity.
Things worth knowing about "Sinding-Larsen-Johansson Syndrome"
Sinding-Larsen-Johansson Syndrome is a painful overuse condition at the lower pole of the kneecap in children and adolescents, commonly triggered by repetitive sports activity.
What is Sinding-Larsen-Johansson Syndrome?
Sinding-Larsen-Johansson Syndrome (SLJ Syndrome) is a traction apophysitis affecting the lower pole of the patella (kneecap) in growing children and adolescents. It typically occurs in physically active young people between the ages of 10 and 14 years. The condition belongs to a group of disorders known as osteochondroses, which arise from repetitive mechanical stress on immature bone and cartilage during periods of rapid growth.
Causes
The primary cause of SLJ Syndrome is chronic overuse of the knee joint due to repeated strong tensile forces exerted by the patellar ligament at its attachment to the inferior pole of the patella. Contributing factors include:
- High-impact sports participation (e.g., soccer, basketball, gymnastics, athletics)
- Rapid growth spurts during adolescence
- Muscular imbalances, particularly tightness of the quadriceps muscle group
- Sudden increases in training volume or intensity
- Insufficient recovery time between training sessions
Symptoms
The hallmark symptom is pain at the lower pole of the kneecap, which typically worsens with activity and improves with rest. Common complaints include:
- Point tenderness at the inferior patellar pole
- Pain during running, jumping, stair climbing, or squatting
- Swelling or a small bony prominence at the lower kneecap
- Increased pain during or after physical activity
- Occasional discomfort after prolonged sitting with a bent knee
Diagnosis
Diagnosis is primarily clinical and is made by a physician based on the history and physical examination. The following diagnostic tools may be used:
- Physical examination: Tenderness at the inferior patellar pole; pain with resisted knee extension
- X-ray: May reveal calcifications or irregular ossification at the lower patella; often normal in early stages
- Ultrasound: Can demonstrate changes at the patellar tendon insertion and detect calcifications
- MRI (Magnetic Resonance Imaging): Used in uncertain cases to assess soft tissue and bone changes in detail
Treatment
Sinding-Larsen-Johansson Syndrome is generally self-limiting, meaning it resolves on its own once skeletal maturity is reached. Treatment is predominantly conservative:
Conservative Measures
- Activity modification or rest: Reducing or temporarily stopping sport is the most important step
- Ice therapy: Local application of ice to reduce pain and swelling
- Physiotherapy: Stretching and strengthening exercises targeting the quadriceps and hamstrings to relieve stress on the patellar tendon
- Pain relief: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen for short-term management of significant pain
- Knee braces or straps: Patellar tendon straps may help reduce load at the tendon insertion during rehabilitation
Surgical Treatment
Surgery is rarely required and is only considered in exceptional cases where bony fragments persist and cause ongoing symptoms after skeletal maturity.
Prognosis
The prognosis is excellent. The vast majority of affected children and adolescents become completely symptom-free once bone growth is complete, with no long-term damage. Consistent activity modification during the acute phase is essential to prevent complications. Returning to sport too early without adequate rehabilitation may prolong recovery.
References
- Gholve P. A. et al. - Sinding Larsen Johansson Syndrome. In: Current Opinion in Pediatrics, 2007; 19(1): 88–92.
- Patel D. R., Villalobos A. - Evaluation and management of knee pain in young athletes. In: Translational Pediatrics, 2017; 6(3): 190–198.
- Cassas K. J., Cassettari-Wayhs A. - Childhood and adolescent sports-related overuse injuries. In: American Family Physician, 2006; 73(6): 1014–1022.
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