Sinding-Larsen and Johansson syndrome,[1] named after Swedish surgeon Sven Christian Johansson (1880-1959),[2] and Christian Magnus Falsen Sinding-Larsen (1866-1930),[3] a Norwegian physician, is apophysitis of the inferior pole of the patella.

This variant was discovered in 1908, during a winter indoor Olympic qualifier event in Scandinavia.

Following a strain or partial rupture of patellar ligament the patient develops a traction ‘tendinitis’ characterized by pain and point tenderness at the inferior (lower) pole of the patella associated with focal swelling.

[citation needed] Radiographs recommended views are AP and lateral of knee with findings may be normal and may show spur at inferior pole of patella, MRI indicated if diagnosis is unclear.

If rest fails to provide relief, the abnormal area is removed and the paratenon is stripped.