Peer-reviewed veterinary case report
Pelvic limb angles in Chihuahuas with kneecap dislocation compared
By Phetkaew, Thitaporn et al.Ā·Published in Veterinary and comparative orthopaedics and traumatology : V.C.O.TĀ·2018Ā·Department of Veterinary SurgeryĀ·View original on PubMed ā
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Original publication title: A Comparison of Angular Values of the Pelvic Limb with Normal and Medial Patellar Luxation Stifles in Chihuahua Dogs Using Radiography and Computed Tomography.
- Species:
- dog
Plain-English summary
A group of Chihuahuas with varying degrees of medial patellar luxation (MPL), a condition where the kneecap dislocates, were examined using X-rays and CT scans to see how their leg angles compared to healthy dogs. The study found that certain angles in the leg were significantly different in dogs with more severe MPL. Specifically, the angles related to the femur and tibia changed with the severity of the condition. This research suggests that while X-rays can be useful, CT scans may provide a better assessment of leg angles in dogs with MPL.
People also search for: Chihuahua patellar luxation treatment Ā· dog knee cap dislocation symptoms Ā· how to treat MPL in dogs
Abstract
OBJECTIVE:  This article aimed to determine and compare the angular values of the pelvic limb in normal and medial patellar luxation (MPL) stifles in Chihuahuas using radiography and computed tomographic (CT) scan, to identify the relationship between pelvic limb angles and severity of MPL. In addition, radiographic and CT images were compared to determine the more suitable method of limb deformity assessment. METHODS:  Sixty hindlimbs of Chihuahuas were divided into normal and grade 1, 2, 3 and 4 MPL groups. The pelvic limb angles in frontal and sagittal planes were evaluated on radiography and CT scan. Femoral and tibial torsion angles (FTA and TTA) were evaluated only by CT scan. All angles were compared among normal and MPL stifles and between radiography and CT scan. RESULTS:  Based on the CT scan, the mechanical lateral distal femoral angle (mLDFA), anatomical caudal proximal femoral angle (aCdPFA), and TTA were related to the severity of MPL. The mLDFA and TTA were significantly increased ( < 0.05) in grade 4 MPL, while the aCdPFA was significantly decreased in grade 2, 3 and 4 MPL groups. There were significant differences of many angles between radiography and CT scan. CLINICAL SIGNIFICANCE:  The angles related to MPL in Chihuahuas are aLDFA, mLDFA, aCdPFA and TTA. Radiography had some limitations for evaluating pelvic limb angles. The caudocranial radiograph is recommended for the assessment of the distal femoral angles, while the craniocaudal radiograph is for the tibial angles.
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Search related cases āOriginal publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/29534279/