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J Knee Surg 2021; 34(07): 699-704
DOI: 10.1055/s-0039-1700839
Original Article

Femoral Trochlear Geometry in Patients with Trochlear Dysplasia Using MRI Oblique Trochlear View

Luiz Felipe Ambra
1   Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo—Escola Paulista de Medicina (DOT—UNIFESP/EPM), São Paulo, Brazil
,
Pedro Henrique Schmidt Alves Ferreira Galvão
1   Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo—Escola Paulista de Medicina (DOT—UNIFESP/EPM), São Paulo, Brazil
,
Enzo Salviatto Mameri
1   Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo—Escola Paulista de Medicina (DOT—UNIFESP/EPM), São Paulo, Brazil
,
Jack Farr
2   Department of Orthopedic Surgery, OrthoIndy Knee Preservation Cartilage Restoration Center of Indiana, Greenwood, Indiana
,
Andreas H. Gomoll
3   Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York
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Abstract

The objective of this study was to evaluate trochlear morphology in patients with trochlear dysplasia using a new oblique trochlear magnetic resonance imaging (MRI) view (OTV) in comparison with standard axial MRI sequences. MRI exam of 73 patients with patellofemoral instability (PFI) and the same number of controls were retrospectively reviewed. The oblique trochlear sequence was acquired by inclining the axial plane parallel to the intercondylar roof of the sagittal image, showing the anterior cruciate ligament (ACL) in its entire length. Trochlear morphology was assessed on axial and oblique trochlear sequences at three levels: level 1 at 25%, level 2 at 50%, and level 3 at 75% of the length of the trochlear groove. Trochlear sulcus angle and sulcus depth were measured at these three levels and compared between the new trochlear and standard axial sequences. Trochlear sulcus angle and sulcus depth were statistically different between axial and oblique trochlear views at all three levels (p < 0,05). Additionally, OTV displayed more uniform sulcus angle and depth along the trochlea. The oblique trochlear view on the MRI can more accurately evaluate trochlear morphology and also better characterize trochlear dysplasia in patients with PFI. This is Level III, retrospective comparative study.

Keywords

patellofemoral instability - knee - patellar dislocation


Publication History

Received: 15 October 2018

Accepted: 18 September 2019

Article published online:
07 November 2019

© 2019. Thieme. All rights reserved.

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