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NEW METHOD OF ACETABULAR ORIENTATION MEASUREMENT IN THA
- Authors: Dianov S.V.1, Domovitov S.V.2, Zhuzhnev A.V.3, Shikunov D.A.4, Semenov A.L.5
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Affiliations:
- Astrakhan State Medical University
- Podolsk City Clinical Hospital
- Yeysk Central District Hospital
- State Research Center Burnasyan Federal Medical Biophysical Center
- Guzhvin Boarding School for Gifted Children
- Issue: Vol 23, No 4 (2017)
- Pages: 112-117
- Section: MODERN TECHNOLOGIES IN TRAUMATOLOGY AND ORTHOPEDICS
- URL: https://journal.rniito.org/jour/article/view/838
- DOI: https://doi.org/10.21823/2311-2905-2017-23-4-112-117
- ID: 838
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Abstract
Relevance. The correct implantation of acetabular component in total hip arthroplasty is an important factor for obtaining good outcomes and long-term survival of the prosthesis. The anteversion angle is one of the significant indicators for the three-dimensional orientation of the cup. The purpose of the study — to develope the method of calculating the anteversion angle of the acetabular component using postoperative anteroposterior radiographs of the hip and pelvis.
The method. The authors used the projection ellipse formed by the opening of the prosthesis cup on the radiograph centered on the hip joint to calculate the desired value. The ratio sine of projectional diameter of the ellipse to its true diameter is a mathematical formula for finding the angle of anteversion. The comparison of the calculated index on anteroposterior radiographs centered on the hip joint and on the pelvis is necessary to identify the distinction between anteversion and retroversion of the acetabular component. In negative anteversion, or retroversion, the projectional diameter on the pelvic radiograph is larger than on the radiograph focused on the hip joint.
Conclusion. Measuring of anteversion angle of acetabular component on postoperative radiograph allows to gain an optimal orientation of acetabular component which decreases postoperative complications rate. X-rays of any scale can be used for measurements while the ratio but not the absolute value of measured diameters is important for the result.
About the authors
S. V. Dianov
Astrakhan State Medical University
Email: fake@neicon.ru
Sergei V. Dianov — Dr. Sci. (Med.), Professor, Head of the Chair of Traumatology and Orthopaedics.
121, Bakinskaya ul., Astrakhan, 414000 Russian FederationS. V. Domovitov
Podolsk City Clinical Hospital
Author for correspondence.
Email: doctor1981@rambler.ru
Stepan V. Domovitov — Cand. Sci. (Med.), Orthopaedics Surgeon.
38, Kirova ul., Podolsk, 142100
Russian FederationA. V. Zhuzhnev
Yeysk Central District Hospital
Email: fake@neicon.ru
Aleksandr V. Zhuzhnev — Orthopaedics Surgeon.
145, Engelsa ul., Yeysk, 353690
Russian FederationD. A. Shikunov
State Research Center Burnasyan Federal Medical Biophysical Center
Email: fake@neicon.ru
Dmitrii A. Shikunov — Roentgenologist.
23, Marshala Novikova ul., Moscow, 123098
Russian FederationA. L. Semenov
Guzhvin Boarding School for Gifted Children
Email: fake@neicon.ru
Aleksei L. Semenov — teacher.
103, ul. Bezzhonova, Astrakhan, 414018
Russian FederationReferences
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