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Vet Comp Orthop Traumatol 2018; 31(02): 114-123
DOI: 10.3415/VCOT-17-05-0067
Original Research
Schattauer GmbH Stuttgart

A Comparison of Angular Values of the Pelvic Limb with Normal and Medial Patellar Luxation Stifles in Chihuahua Dogs Using Radiography and Computed Tomography

Thitaporn Phetkaew
,
Marissak Kalpravidh
,
Rampaipat Penchome
,
Chalika Wangdee
Further Information

Publication History

11 May 2017

13 November 2017

Publication Date:
13 March 2018 (online)

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Correction to:

Addendum: A Comparison of Angular Values of the Pelvic Limb with Normal and Medial Patellar Luxation Stifles in Chihuahua Dogs Using Radiography and Computed TomographyVet Comp Orthop Traumatol 2018; 31(02): a1-a1
DOI: 10.1055/s-0038-1667359

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 (p < 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.

Keywords

Chihuahua - medial patellar luxation - pelvic limb deformity - computed tomography - radiography

Author Contributions

All authors contributed to the study conception. T. Phetkaew and C. Wangdee contributed to the study design. T. Phetkaew, R. Penchome and C. Wangdee contributed to the acquisition of data. All authors contributed to data analysis and interpretation, drafting or revising of the manuscript, and approved the submitted manuscript.


 

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