Luxation/Subluxation

Authors: Sebastian Prior, Francisco Silveira, Lida Pappa, Pablo Pérez López, Robert Quinn, Darren Barnes

Background: This study aimed to determine whether Blumensaat's line, a consistently present radiographic feature delineating the peak of the femoral intercondylar fossa, could be used to assess for cranial tibial subluxation in canine stifles with cranial cruciate ligament disease.

Authors: Petar Polajnar, Zsigmond Szanto, Florian Willmitzer, Nikola Medl

A 9-year-old, neutered, male, Cairn terrier dog presented with a 3-year history of progressive pain and lameness of the right hindlimb. After an acute episode of severe pain and non-weight-bearing lameness, the dog was referred to our clinic for evaluation.

The physical examination was unremarkable; the orthopaedic examination revealed a positive cranial drawer sign and medial patellar luxation grade 3/4. Orthogonal radiographs were taken. Chronic degenerative changes consistent with cranial cruciate ligament insufficiency and medial patellar luxation were noted.

Authors: Cheol-Kyu Han, Jinsu Kang, Haebeom Lee, Namsoo Kim, Suyoung Heo

Objectives: The aim of this study was to describe an alternative landmark for screw insertion into the body of the ilium with bilateral sacroiliac luxation in cats.

Authors: Esa V Eskelinen, Ari P Suhonen, Juha V Virolainen, William D Liska

Objectives: The purpose of this study was to compare the load at failure, stiffness and mode of failure between three types of tibial tuberosity transposition fixation techniques: (a) pin and figure-8 tension band wire (Pin-TBW), (b) locking plate with pin and a tension band wire (Plate-Pin-TBW) and (c) locking plate with a pin (Plate-Pin).

Authors: Daniel A McCarthy, L Abbigail Granger, Karanvir S Aulakh, J Alberto Gines

Objective: To improve the accuracy of drilling during the repair of sacroiliac luxations (SILs) with a 3D-printed patient-specific drill guide (3D-GDT) compared to free-hand drilling technique (FHDT).

Study design: Blinded, randomized, prospective ex vivo study.

Sample population: Sixteen canine cadavers (20-25 kg).

Authors: Liene Feldmane, Lars F H Theyse

Objective: To assess the role of the proximodistal and caudocranial relative position of the patellar ligament insertion on the tibia and patellar ligament length-to-patellar length ratio (PLL:PL) in small-breed dogs with and without grade II medial patellar luxation (MPL).

Study design: Retrospective study.

Sample population: Dogs weighing ≤15 kg, including 43 stifles with MPL and 34 control stifles.

Authors: Shinji Yasukawa, Kazuya Edamura, Koji Tanegashima, Mamiko Seki, Kazushi Asano, Tomohiro Nakayama, Kei Hayashi

Objective: The aim of this study was to evaluate the bone deformities of the distal femur of Toy Poodles with medial patellar luxation (MPL) using computed tomography.

Authors: Jorge Espinel Rupérez et al.

Objective: To report overall rate and type of complications and outcomes of cats with coxofemoral luxation managed with hip toggle stabilization (HTS), to compare rate of postoperative complications and outcomes of cats treated with ultrahigh-molecular-weight-polyethylene (UHMWPE) or nylon, and to identify risk factors for reluxation and non-excellent outcomes.

Study design: Multi-institutional retrospective cohort study.

Authors: K. L. Perry L. M. Déjardin

Despite being one of the most commonly diagnosed causes of canine hind limb lameness, the pathogenesis of medial patellar luxation remains incompletely understood. Most cases are considered developmental with anatomical deformities leading to failure of the stifle extensor mechanism. These include coxa vara, coxa valga, reduced anteversion angle, distal external femoral torsion, excessive distal femoral varus, internal proximal tibial torsion, proximal tibial valgus, tibial tuberosity medialisation, patella alta and shallow trochlear groove.

Authors: Richard L Meeson, Rhiannon Strickland