Knee

Question 1

Typical locations of SIFK(SONK)?

Answer 1

-almost always unilateral, usually affects the medial femoral condyle(weight bearing) -occasionally involve the tibial plateau -often associated with a meniscal tear

Question 2

What is SIFK? What is the pathology?

Answer 2

-Spontaneous insufficiency fracture of the knee (SIFK) has similar appearances to osteochondritis dissecans of the knee -previously known as spontaneous osteonecrosis of the knee (SONK/SPONK) -older age group -not caused by osteonecrosis but instead by osteoporosis and insufficiency fractures

Question 3

Late stages features of SFIK in XR?

Answer 3

-flattening of the medial femoral condyle -subchondral radiolucent focus -complicating subchondral fracture with periosteal reaction

Question 4

Association of infrapatellar bursitis?

Answer 4

Osgood-Schlatter disease