|Articular cartilage injury||The patient may describe a history of trauma, and the mechanical symptoms may occur if a loose body is present.|
May have effusion or have a tenderness of the involved structure (e.g., femoral condyles, patella).
|Chondromalacia patellae||The patient may have a retro-patellar pain, a history of trauma, or an effusion on the examination.|
|Hoffa’s disease||The patient may have a pain and tenderness localized to infrapatellar fat pad.|
|Osgood–Schlatter disease||The patient may have tenderness and/or swelling at the insertion of the patellar tendon at the tibial tubercle in an adolescent.|
|Patellar instability/subluxation||The patient may have an intermittent pain with a sensation of instability or movement of the patella.|
May have a swelling or a locking can occur with loose bodies. May have tenderness over the medial retinaculum.
|Patellar tendinopathy||The patient may have tenderness over the tendon.|
The tendon may be thickened if the condition is chronic.
|Pes anserine bursitis||The pain is usually described as medial rather than anterior in location with tenderness over the pes anserine bursa.|
|Prepatellar bursitis||May be medial or lateral to the patella; if symptomatic, tenderness can be demonstrated on examination.|
|Plica synovialis||The patient may have a characteristic swelling anterior to the patella following trauma.|
|Quadriceps tendinopathy||The patient may have tenderness over the tendon.|
|Sinding–Larsen–Johansson syndrome||The patient may have tenderness at the patellar tendon insertion in the inferior pole of the patella in an adolescent.|
|Symptomatic bipartite patella||The patient may have tenderness directly over the patella with characteristic radiographic findings.|