Patellar Groove Replacement in a Cat

Abstract

The aim of this study was to report patellar groove replacement in a 6-year-old domestic short hair cat with chronic unilateral pelvic limb lameness and severe femoro-patellar osteoarthritis due to medial patellar luxation. This study is a case report. Computed tomographic scan of the affected limb revealed marked periarticular osteophytosis, medial trochlear ridge erosion, marked flattening of femoral trochlea, ectopic pseudo-trochlear groove, and medial patellar luxation. Femoral trochlear ostectomy with patellar groove replacement, release of the medial fibrocartilage, partial parasagittal patellectomy, and lateral tibial tuberosity were performed. Clinical review and radiographs performed 53 days post-surgery revealed no complications and substantial decrease in lameness. Thirteen months postoperatively the cat scored 2/72 on the Feline Musculoskeletal Pain Index questionnaire by the owner, indicating good mobility, minimal discomfort, and good quality of life. As far as the authors are aware, this is the first report of the use of patellar groove replacement in the management of feline medial patellar luxation. Patellar groove replacement, in combination with adjunctive procedures, resulted in a substantial improvement in lameness in this cat with chronic medial patellar luxation and severe femoro-patellar osteoarthritis.

Trochlear Ridge Prostheses for Reshaping Femoral Trochlear Ridges in Dogs with Patellar Luxation

“…1 ), which facilitates osteointegration. 17 18 19 The thickness of the plate is based on dog size and ranges from 0.5 to 1 mm. The TRP plates are parallel to each other and perpendicular to the femur in the frontal plane.…”

“…8,11 Complications, such as osteochondral wedge dislodgment or fracture of the trochlear ridge, have been described. 9,[12][13][14][15] Other surgical procedure such as patellar groove replacement (PGR; Kyon, Zurich, Switzerland) and Ridgestop (Orthomed, Huddersfield, United Kingdom) have been proposed in dogs 16,17 and cats 18,19 to reshape the whole femoral trochlea or the femoral trochlear ridge, respectively. Ridgestop consists of a polyethylene ridge, which is held in place with cortical screws.…”

Computed Tomographic Measurement Method for Morphoanatomical Comparison of Femur, Tibia, and Patella in Cats with and without Medial Patellar Luxation

“…Tibial tuberosity transposition (TTT), recession trochleoplasties (wedge or block), soft tissue techniques, and patellar groove replacement have been described to treat feline patellar luxation. 1,4,[14][15][16] Partial parasagittal patellectomy has also been described as a supplemental technique to block recession trochleoplasty, considering cats' naturally wide patella. 14,17,18 A short case series described a semicylindrical trochleoplasty alternative in five feline stifles to accommodate the wide feline patella.…”

Short-term outcomes for surgical correction of feline medial patellar luxations via semi-cylindrical recession trochleoplasty

“… 14 Of these, the most common major complication was implant related (when TTT was utilized), and the overall patellar reluxation rate across the various MPL reparative procedures performed was 5%. 14 Other techniques, such as sulcal ridge prostheses 16 and patellar groove replacement (PGR), 17 have rarely been adapted for use in cats.…”