Sinding Larsen Johansson Syndrome (SLJS): 

  • Juvenile osteochondrosis and traction of patella growth plate affecting the extensor mechanisms of the knee, patella tendon irritation

  • Inflammation of the growth plate (apophysis) at the bottom of the kneecap (patella) where the patellar tendon inserts

    • Growth plates are made up of cartilage cells which are softer and more vulnerable to injury than mature bone 

  • Often seen in children ages 10 to 15

  • Caused by increased tension and pressure on the growth center  → results from overuse the knee (repetitive running and jumping)

    • Tight quadriceps muscles also puts pressure on this growth center 

    • Tight muscles → common during a growth spurt 

  • Signs/Symptoms: tenderness at inferior pole of patella (directly below knee cap)

    • Worse with activity (stairs, squatting, running and jumping)

    • May have swelling 

  • Typically occurs during growth spurt 

  • Children with cerebral palsy (CP) are prone to SLJS