Medial condyle trochlear offset
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Medial condyle trochlear offset (MCTO) is a measurement to assess the height of the medial trochlear facet with respect to the trochlear groove 1.
Usage
Medial condyle trochlear offsethas been described for the assessment of trochlear dysplasia in skeletally immature patients 1. It measures and/or quantifies a flat or hypoplastic medial facet, described in type B-D of the Dejour classification 2, as a risk factor for patellofemoral instability 1.
Measurement
The distance between the most anterior point of the medial trochlear facet and a tangential line through the trochlear groove parallel to the posterior bony contours of the femoral condyles is measured 1. In severely hypoplastic medial facets the measurement can yield a negative value 1. The measurement is conducted on the most superior/proximal axial image showing complete cartilage coverage of the trochlea 1.
Interpretation
A cut-off value of ≤1 mm was found to be highly specific and fairly sensitive for patellofemoral instability, with a reported sensitivity and specificity of 75% and 93% in that study 1.
History and etymology
Medial condyle trochlear offset was described by M. Stepanovich as a measurement for skeletally immature patients 1.
-<p><strong><strong>Medial condyle trochlear offset (MCTO) </strong></strong>is a measurement to assess the height of the medial trochlear facet with respect to the trochlear groove <sup>1</sup>.</p><h4>Usage</h4><p>Medial condyle trochlear offset<strong><strong> </strong></strong>has been described for the assessment of <a href="/articles/trochlear-dysplasia">trochlear dysplasia</a> in skeletally immature patients <sup>1</sup>. It measures and/or quantifies a flat or hypoplastic medial facet, described in type B-D of the Dejour classification <sup>2</sup>, as a risk factor for <a href="/articles/patellofemoral-instability">patellofemoral instability</a> <sup>1</sup>.</p><h4>Measurement</h4><p>The distance between the most anterior point of the medial trochlear facet and a tangential line through the trochlear groove parallel to the posterior bony contours of the femoral condyles is measured<sup> 1</sup>. In severely hypoplastic medial facets the measurement can yield a negative value <sup>1</sup>. The measurement is conducted on the most superior/proximal axial image showing complete cartilage coverage of the trochlea <sup>1</sup>.</p><h4>Interpretation</h4><p>A cut-off value of ≤1 mm was found to be highly specific and fairly sensitive for <a href="/articles/patellofemoral-instability">patellofemoral instability</a>, with a reported sensitivity and specificity of 75% and 93% in that study <sup>1</sup>.</p><h4>History and etymology</h4><p>Medial condyle trochlear offset was described by M. Stepanovich as a measurement for skeletally immature patients <sup>1</sup>.</p>- +<p><strong><strong>Medial condyle trochlear offset (MCTO) </strong></strong>is a measurement to assess the height of the medial trochlear facet with respect to the trochlear groove <sup>1</sup>.</p><h4>Usage</h4><p>Medial condyle trochlear offset<strong><strong> </strong></strong>has been described for the assessment of <a href="/articles/trochlear-dysplasia">trochlear dysplasia</a> in skeletally immature patients <sup>1</sup>. It measures and/or quantifies a flat or hypoplastic medial facet, described in type B-D of the Dejour classification <sup>2</sup>, as a risk factor for <a href="/articles/patellofemoral-instability">patellofemoral instability</a> <sup>1</sup>.</p><h4>Measurement</h4><p>The distance between the most anterior point of the medial trochlear facet and a tangential line through the trochlear groove parallel to the posterior bony contours of the femoral condyles is measured<sup> 1</sup>. In severely hypoplastic medial facets the measurement can yield a negative value <sup>1</sup>. The measurement is conducted on the most superior/proximal axial image showing complete <a href="/articles/articular-cartilage">cartilage</a> coverage of the trochlea <sup>1</sup>.</p><h4>Interpretation</h4><p>A cut-off value of ≤1 mm was found to be highly specific and fairly sensitive for <a href="/articles/patellofemoral-instability">patellofemoral instability</a>, with a reported sensitivity and specificity of 75% and 93% in that study <sup>1</sup>.</p><h4>History and etymology</h4><p>Medial condyle trochlear offset was described by M. Stepanovich as a measurement for skeletally immature patients <sup>1</sup>.</p>
References changed:
- 1. Stepanovich M, Bomar J, Pennock A. Are the Current Classifications and Radiographic Measurements for Trochlear Dysplasia Appropriate in the Skeletally Immature Patient? Orthop J Sports Med. 2016;4(10):2325967116669490. <a href="https://doi.org/10.1177/2325967116669490">doi:10.1177/2325967116669490</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/27826597">Pubmed</a>
- 2. Dejour D & Le Coultre B. Osteotomies in Patello-Femoral Instabilities. Sports Med Arthrosc Rev. 2007;15(1):39-46. <a href="https://doi.org/10.1097/JSA.0b013e31803035ae">doi:10.1097/JSA.0b013e31803035ae</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/17301701">Pubmed</a>
- 1. Stepanovich M, Bomar JD, Pennock AT. Are the Current Classifications and Radiographic Measurements for Trochlear Dysplasia Appropriate in the Skeletally Immature Patient?. (2016) Orthopaedic journal of sports medicine. 4 (10): 2325967116669490. <a href="https://doi.org/10.1177/2325967116669490">doi:10.1177/2325967116669490</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/27826597">Pubmed</a> <span class="ref_v4"></span>
- 2. Dejour D, Le Coultre B. Osteotomies in patello-femoral instabilities. (2007) Sports medicine and arthroscopy review. 15 (1): 39-46. <a href="https://doi.org/10.1097/JSA.0b013e31803035ae">doi:10.1097/JSA.0b013e31803035ae</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/17301701">Pubmed</a> <span class="ref_v4"></span>
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