Highly demanded parameters are now available and support radiologists and orthopedists in faster and more precise detection of hip degeneration causing hip osteoarthritis.
The Tönnis angle, the Sharp angle as well as the Femoral Head Coverage / Extrusion Index are crucial for identifying variations of the hip such as femoroacetabular impingement and hip dysplasia. These parameters are made available with the release of HIPPO 1.02.
IB Lab’s customers can now rely on their decision making in ten different radiological findings and measurements provided by HIPPO, the AI solution for hip positioning and pelvic morphology.
Acetabular undercoverage (hip dysplasia) and overcoverage (pincer-type femoroacetabular impingement) are the main causes of hip osteoarthritis. Detecting early signs of hip degeneration can contribute to improved patient outcomes both for conservative and surgical treatments. HIPPO supports doctors to triage adult patients by providing precise, quantifiable and reproducible measurements of the hip morphology.
The four new fully automated parameters to identify variations of the hip with regards to the anatomic relationship of the femoral head and the acetabulum (acetabular coverage):
The Tönnis angle, also known as the sourcil angle, acetabular index or horizontal toit externe (HTE) angle, is used to evaluate the inclination of the acetabular roof, with a steep slope being an indicator of hip dysplasia.
The Sharp angle, also known as acetabular angle, gives a global estimation of acetabular inclination. An increased acetabular angle can lead to increased pressure and stress in the hip joint.
The Femoral Head Coverage / Extrusion Index can also be used to quantify the acetabular coverage. They describe the portion of the femoral head that is covered / not covered (respectively) by the acetabulum, expressed as a percentage of the total diameter of the femoral head.
HIPPO provides the new measurements in the form of a graphical report, with the measurements on top of the original x-ray image and highlighting the findings out of the normal ranges [2,3]. The results are attached to the original hip study and are immediately available on your PACS system.
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 Tannast M, Hanke MS, Zheng G, Steppacher SD, Siebenrock KA. What are the radiographic reference values for acetabular under- and overcoverage?. Clin Orthop Relat Res. 2015;473(4):1234-1246. doi:10.1007/s11999-014-4038-3
 Moritz Tannast, Markus S. Hanke, Guoyan Zheng, Simon D. Steppacher, Klaus A. Siebenrock. What Are the Radiographic Reference Values for Acetabular Under- and Overcoverage?. (2015) Clinical Orthopaedics and Related Research®. 473 (4): 1234. doi:10.1007/s11999-014-4038-3
 Lee YK, Chung CY, Koo KH et-al. Measuring acetabular dysplasia in plain radiographs. Arch Orthop Trauma Surg. 2011;131 (9): 1219-26. doi:10.1007/s00402-011-1279-4