Infrapatellar contracture syndrome, or patella infera, is a more advanced form of arthrofibrosis that can occur either in an isolated form - meaning that it affects just the patellofemoral joint – or in a more extensive form in that it also involves the entire knee joint, where it affects flexion and extension of the knee as well.

For the purposes of the discussion I will just limit the discussion to the type of scarring that affects the patellofemoral joint. Where this scarring usually occurs most commonly is in the medial and lateral gutters and directly behind the patellar tendon, scarring the patellar tendon down to the front of the tibia.
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The anterior interval of the knee is the area between the anterior portion of the tibia (or the front portion of the tibia) and the fat pad which lies in this area and just behind or posterior to the patellar tendon. This area is sometimes called the 'pre-tibial recess' or the 'anterior interval of the knee'.
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Chondromalacia is a term that is commonly used by health professionals – orthopedists, physical therapists, sometimes internists - and in the United States there is even an insurance code for chondromalacia (717.7) - but the fact of the matter is it’s a completely outdated term.
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Patellar malalignment is a general term pertaining to any abnormality of the position or tracking of the patella. Malalignment is a very important diagnosis to make because malalignment of the kneecap and the surrounding tissues has the potential to cause pain and/or instability. It is a diagnosis that is frequently missed.
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