Bipartate patella

Case
A 25-year-old football player was referred to see you with a suspected ‘patella fracture’. He describes a twisting injury on his planted right leg followed by a pop sensation and near immediate pain and swelling in his right knee. He was seen at a local emergency clinic and was told he had fractured his patella based on some x-rays taken while there.

Findings
An AP x-ray image shows a type III (supero-lateral) bipartate patella. In addition, this image also demonstrates a Segond fracture. A subsequent MRI (conducted to define the anterior cruciate ligament and not the patella) shows a normal synchondrosis with no oedema or other abnormality involving the patella. The ACL is ruptured.

Discussion
This player was reassured that his patella was normal and that he had a common anatomical variant. Unfortunately, he required an ACL reconstruction and was out of football for ten months.

A bipartate patella is a common incidental finding on x-ray imaging. They occur in about 3% of the general population and are bilateral in more than 50% of cases. The morphology seen in this case (type III) is the most common variant. Type I bipartate patellae involve the inferior pole (see an earlier radiology review case for an example of this) while type II patellae involve the lateral margin. In the vast majority of cases this finding does not require any further investigation or follow-up. It is unlikely to be relevant in the case of acute knee trauma. It may be more important when a player describes an insidious onset or anterior knee pain.

Important notice
FIFA does not bear any responsibility for the accuracy and completeness of any information provided in the “Radiology Review” features and cannot be held liable with regard to the information provided or any acts or omissions occurring on the basis of this information.

1
Comment

avatar
1 Comment threads
0 Thread replies
0 Followers
 
Most reacted comment
Hottest comment thread
1 Comment authors
Bangoura Recent comment authors
  Subscribe  
newest oldest most voted
Notify of
Bangoura
Guest

La BIPARTITE de la rotule peut être soit congénitale soit acsuise.Dans ce cas précis elle est consécutive à un traumatisme donc acsuise.Apres imagerie si la fracture est sans déplacement le traitement nécessite un plâtre.
Mais si la fracture est consécutive à un déplacement on présence d un osselet une intervention est envisageable et si nous avons en plus une atteinte du LCA une reconstitution s impose