Arthroscopic trochleoplasty is a keyhole procedure to improve the shape of the top of the groove where the kneecap runs, that is in cases of trochlear dysplasia.

Arthroscopic trochleoplasty for trochlear dysplasia

In trochlear dysplasia there is a structural abnormality at the upper part of the trochlear groove, where normally the patella would engage as the person begins to bend the knee. This may be:

  • a groove that is more shallow than usual
  • an absent groove where the region is simply flat
  • an actual bump rather than a groove


The technique of arthroscopic trochleoplasty

trochlear dysplasia with trochlear bump arthroscopic trochleoplasty arthroscopic trochleoplasty with tapes in place
A marked trochlear 'bump' that does not allow the patella to engage with the upper part of the groove of the femur. From a portal above the patella, the arthroscopic surgeon lifts up the delicate joint cartilage and re-shapes the bony bump below it. Absorbable tapes are used to hold the white cartilage against the re-shaped bone until healing takes place.
arthroscopic deepening trochleoplasty
keyhole trochleoplasty

Explaining how the kneecap glides within the underlying groove of the femur bone.

This video is a record of a meeting held by Dr Lars Blønd in order to bring together his patients who have all had the procedure of arthroscopic trochleoplasty.

Dr Lars Blond describes a technique of deepening the groove of the trochlea via the arthroscope, for patients with recurrent dislocation of the patella.



Arthroscopic deepening trochleoplasty for chronic anterior knee pain after previous failed conservative and arthroscopic treatment. Report of two cases Lars Blønd. Int J Surg Case Rep. 2017; 40: 63–68.

Trochleoplasty: Indications and Technique. Nolan,JE III, Schottel PC and Endres NK. Curr Rev Musculoskelet Med. 2018 Jun; 11(2): 231–240.

See also:

Factors contributing to an Unstable Patella - ebook