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Premium Proximodistal Alignment of the Canine Patella: Radiographic Evaluation and Association with Medial and Lateral Patellar Luxation
Author(s)
MOSTAFA AYMAN A.,
GRIFFON DOMINIQUE J.,
THOMAS MICHAEL W.,
CONSTABLE PETER D.
Publication year2008
Publication title
veterinary surgery
Resource typeJournals
PublisherBlackwell Publishing Inc
Objectives— To evaluate the contribution of proximodistal alignment of the patella to patellar luxation, and to evaluate the structures contributing to proximodistal alignment of the patella relative to the femoral trochlea. Study Design— Retrospective study using a convenience sample. Animals— Medium to giant breed dogs (n=106). Methods— Medical records and stifle radiographs of 106 dogs were reviewed. Radiographic measurements evaluated the proximodistal alignment of the patella with respect to the femoral trochlea, distal aspect of the femur, and proximal aspect of the tibia. Measurements were compared between dogs with clinically normal stifles (controls; n=51 dogs, 66 stifles), and dogs with a clinical diagnosis of medial patellar luxation (MPL, n=46 dogs, 65 stifles) or lateral patellar luxation (LPL, n=9 dogs, 11 stifles) using ANOVA. Results— In dogs with MPL, the ratio of patellar ligament length (PLL) to patellar length (PL) was increased, as was the ratio of the distance from the proximal aspect of the patella to the femoral condyle (A) to PL ( P <.0001). Dogs with LPL had a decreased A:PL ( P =.003) and an increased ratio of the proximal tibial length (PTL) to distal tibial width (DTW; P =.009). Conclusions— MPL is associated with a relatively long patellar ligament and patella alta in medium to giant breed dogs. LPL is associated with a relatively long proximal tibia and patella baja. Values for PLL:PL>2.06 and A:PL>2.03 are suggestive of the presence of patella alta, whereas a value for A:PL<1.92 is suggestive of patella baja. Clinical Relevance— Measurements of both PLL:PL and A:PL are recommended in dogs with patellar luxation, and surgical correction should be considered in those with abnormal values.
Subject(s)anatomy , anterior cruciate ligament , cruciate ligament , femur , medicine , patella , patellar ligament , patellar tendon , radiography , stifle joint , surgery , tibia
Language(s)English
SCImago Journal Rank0.652
H-Index79
eISSN1532-950X
pISSN0161-3499
DOI10.1111/j.1532-950x.2008.00367.x

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