Anterior Knee pain

Patella Dislocation
In a normal knee, your patella is positioned within a groove at the bottom of the femur (thigh bone).
Patella dislocation refers to when the kneecap is completely displaced out of its normal alignment. The most common direction for a patella to dislocate is outwardly (laterally). When this happens, the muscles and ligaments on the inside of the knee become overstretched and damaged.

What Causes Patella Dislocation?
Dislocation of the patella is primarily caused by a traumatic incident (often twisting or a direct blow) to the knee.

However, there are a variety of factors which can predispose you to dislocate your patella. These include:

  • History of patella dislocation or subluxation
  • Patellofemoral joint hyperlaxity or maltracking
  • Shallow femoral groove
  • Weak inner quadriceps muscles
  • Tight lateral retinaculum, ITB, hip flexors, vastus lateralis and biceps femoris muscles.

What are the Symptoms of Patella Dislocation?

  • Patients with a dislocated patella will report that “my kneecap slipped out of place”. It may self-relocate, otherwise, a health professional may need to relocate your patella.
  • Visible translation of the kneecap (often to the outside of the knee).
  • Pain, particularly with weight-bearing activities and active straightening of the knee.
  • Swelling and a wobbly kneecap.
  • Tenderness around your kneecap.
  • Feeling of instability or giving way during weight bearing.
  • A weakness of the quadriceps muscles.