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02.07.2019 | Orthopaedic Surgery | Ausgabe 2/2020

Archives of Orthopaedic and Trauma Surgery 2/2020

Trochlear dysplasia relates to medial femoral condyle hypoplasia: an MRI-based study

Zeitschrift:
Archives of Orthopaedic and Trauma Surgery > Ausgabe 2/2020
Autoren:
Armin Keshmiri, Philip Schöttle, Carolin Peter
Wichtige Hinweise
The work was performed at the Knee and Hip Institute Munich.

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Abstract

Purpose

Trochlear dysplasia is one of the most important pathomorphologies predisposing to patellofemoral instability. The development of the trochlea groove is not well understood so far. We hypothesized that the underlying pathology of trochlear dysplasia is a medial hypoplasia.

Methods

110 magnetic resonance imaging (MRI) scans from adult knees, 55 with and 55 without trochlear dysplasia were analyzed. On the axial and sagittal T2 MRI sequences, the height (h), width (w) and depth (d) of the medial (MC) and lateral femoral condyle (LC) as well as the depth of the trochlea groove (dTG) were measured using a three-dimensional measuring algorithm.

Results

For all calculated values of the lateral femoral condyle, the comparison of both groups showed no significant difference (p = 0.95, p = 0.11, p = 0.07). The depth of the trochlear groove (dTG) showed significant lower values in the study group (p < 0.05). In the study group, all measurements of the medial femoral condyle were statistically significantly smaller compared to the control group (p < 0.05).

Conclusions

We found that the height, the width and the depth of the medial condyle is significant smaller in patients with trochlea dysplasia than in healthy controls. The measurements of the lateral femoral condyle showed no significant difference. Patients with a dysplastic trochlea have a hypoplastic medial femoral condyle and a more medially placed trochlea groove compared to controls.

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