Patellar instability-CT
Patellar Instability (TT - TG measurement) Case Submitted by Dr Ayush Goel
1. Trochlear dysplasia,
2. High positioning of the patella (aka patella alta)
3. Lateralization of the tibial tuberosity (measured as distance between the tibial tubercle and the trochlear groove or the TT-TG distance )
Normal TT-TG is less than 15mm
Borderline 15 - 20
Abnormal > 20mm
The images show measurement of TT-TG distance.
Method : A tangential is drawn joining the posterior margins of femoral condyles. A line is drawn passing through the deepest point in trochlear groove (femoral sulcus), which is perpendicular to the tangential drawn initially.
Now either we can use superimposition or simple scrolling down to reach the tibial tuberosity. Another line is drawn perpendicular to the tangential drawn initially, this 3rd line should pass through the mid point of tibial tuberosity.
Abnormal > 20mm
The images show measurement of TT-TG distance.
Method : A tangential is drawn joining the posterior margins of femoral condyles. A line is drawn passing through the deepest point in trochlear groove (femoral sulcus), which is perpendicular to the tangential drawn initially.
Now either we can use superimposition or simple scrolling down to reach the tibial tuberosity. Another line is drawn perpendicular to the tangential drawn initially, this 3rd line should pass through the mid point of tibial tuberosity.
Patellar instability-CT
Reviewed by Sumer Sethi
on
Monday, May 20, 2013
Rating:
Reviewed by Sumer Sethi
on
Monday, May 20, 2013
Rating:
Sumer Sethi
Unique blend of academic excellence and entrepreneurship, heading leading firms in India- Teleradiology Providers, pioneering company providing teleradiology services and DAMS (Delhi Academy of Medical Sciences) Premier test preparation institute in India for MD/MS/MCI preparation. He has also been an invited faculty member at various conferences, including Teleradiology in IRIA 2008 and 2011, Hospital Build Middle East, Congress of the Brain Tumor Radiology in Neuro-oncology Society. Dr. Sethi is Editor-in-Chief of Internet Journal of Radiology. He has a keen interest in Web 2.0 technologies and in maintaining his famous radiology blog, which has been featured in multiple international journals.
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