Surgical treatment of medial patellar luxation is indicated where the dislocation of the kneecap is causing troublesome lameness (either intermittent or continuous).
Patellar luxation is graded as follows:
Grade 1 – Patella can be manually luxated, but does not usually luxate spontaneously
Grade 2 – Patella luxates spontaneously but is usually in a normal position
Grade 3 – Patella tends to be luxated at rest, but can be manually replaced
Grade 4 – Patella is luxated at rest and cannot be manually reduced
We recommend surgery for grades 2-4. Grade 1 luxation may not require surgery, although potentially early surgical treatment may prevent progression to higher grades.
Treatment consists of procedures to deepen the femoral trochlear sulcus (sulcoplasty), tibial tuberosity transpostion to realign the quadriceps mechanism with the groove, medial release of soft tissues to mobilise the patella if required and lateral imbrication of the joint capsule/fascia lata to stabilise the patella in the groove.
Occasionally, medial patellar luxation is related to femoral deformity, and in a small number of cases a distal femoral osteotomy (DFO) is indicated as part of the surgical plan.
You can download a client information sheet for treatment of medial patellar luxation here