Are there clinically relevant anatomical differences of the proximal femur in patients with mild dysplastic and primary hip osteoarthritis? - A CT-data based matched pairs cohort study

Moritz Innmann, Sven Hasberg, Wenzel Waldstein, George Grammatopoulos, Harinderjit Gill, Elise Pegg, Peter R Aldinger, Christian Merle

Research output: Contribution to journalArticle

Abstract

AIM: To investigate the three-dimensional anatomy and shape of the proximal femur,comparing patients with secondary osteoarthritis (OA) due to mild developmental dysplasia ofthe hip (DDH) and primary hip OA.MATERIALS AND METHODS: This retrospective radiographic computed tomography (CT)-based study investigated proximal femoral anatomy in a consecutive series of 84 patients withsecondary hip OA due to mild DDH (Crowe type I&II/Hartofilakidis A) compared to 84 patientswith primary hip OA, matched for gender, age at surgery, and body mass index.RESULTS: Men with DDH showed higher neck shaft angles (1275vs. 1234;p<0.001),whereas women with DDH had a larger femoral head diameter (464vs.443 mm;p¼0.002),smaller femoral offset (365 vs. 404 mm;p<0.001), decreased leg torsion (2513vs.3116;p¼0.037), and a higher neck shaft angle (1287vs. 1234;p<0.001) compared toprimary OA patients. Similar patterns of the three-dimensional endosteal canal shape of theproximal femur, but a high inter-individual variability for femoral canal torsion at the meta-diaphyseal level were found for DDH and primary OA patients.CONCLUSION: Standard cementless stem designs are suitable to treat patients with sec-ondary hip OA due to mild DDH; however, high patient variability and subtle anatomicaldifferences in the proximal femur should be respected.
Original languageEnglish
Number of pages6
JournalClinical Radiology
Early online date26 Aug 2019
DOIs
Publication statusE-pub ahead of print - 26 Aug 2019

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Are there clinically relevant anatomical differences of the proximal femur in patients with mild dysplastic and primary hip osteoarthritis? - A CT-data based matched pairs cohort study. / Innmann, Moritz; Hasberg, Sven; Waldstein, Wenzel; Grammatopoulos, George; Gill, Harinderjit; Pegg, Elise; Aldinger, Peter R; Merle, Christian.

In: Clinical Radiology, 26.08.2019.

Research output: Contribution to journalArticle

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abstract = "AIM: To investigate the three-dimensional anatomy and shape of the proximal femur,comparing patients with secondary osteoarthritis (OA) due to mild developmental dysplasia ofthe hip (DDH) and primary hip OA.MATERIALS AND METHODS: This retrospective radiographic computed tomography (CT)-based study investigated proximal femoral anatomy in a consecutive series of 84 patients withsecondary hip OA due to mild DDH (Crowe type I&II/Hartofilakidis A) compared to 84 patientswith primary hip OA, matched for gender, age at surgery, and body mass index.RESULTS: Men with DDH showed higher neck shaft angles (1275vs. 1234;p<0.001),whereas women with DDH had a larger femoral head diameter (464vs.443 mm;p¼0.002),smaller femoral offset (365 vs. 404 mm;p<0.001), decreased leg torsion (2513vs.3116;p¼0.037), and a higher neck shaft angle (1287vs. 1234;p<0.001) compared toprimary OA patients. Similar patterns of the three-dimensional endosteal canal shape of theproximal femur, but a high inter-individual variability for femoral canal torsion at the meta-diaphyseal level were found for DDH and primary OA patients.CONCLUSION: Standard cementless stem designs are suitable to treat patients with sec-ondary hip OA due to mild DDH; however, high patient variability and subtle anatomicaldifferences in the proximal femur should be respected.",
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T1 - Are there clinically relevant anatomical differences of the proximal femur in patients with mild dysplastic and primary hip osteoarthritis? - A CT-data based matched pairs cohort study

AU - Innmann, Moritz

AU - Hasberg, Sven

AU - Waldstein, Wenzel

AU - Grammatopoulos, George

AU - Gill, Harinderjit

AU - Pegg, Elise

AU - Aldinger, Peter R

AU - Merle, Christian

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N2 - AIM: To investigate the three-dimensional anatomy and shape of the proximal femur,comparing patients with secondary osteoarthritis (OA) due to mild developmental dysplasia ofthe hip (DDH) and primary hip OA.MATERIALS AND METHODS: This retrospective radiographic computed tomography (CT)-based study investigated proximal femoral anatomy in a consecutive series of 84 patients withsecondary hip OA due to mild DDH (Crowe type I&II/Hartofilakidis A) compared to 84 patientswith primary hip OA, matched for gender, age at surgery, and body mass index.RESULTS: Men with DDH showed higher neck shaft angles (1275vs. 1234;p<0.001),whereas women with DDH had a larger femoral head diameter (464vs.443 mm;p¼0.002),smaller femoral offset (365 vs. 404 mm;p<0.001), decreased leg torsion (2513vs.3116;p¼0.037), and a higher neck shaft angle (1287vs. 1234;p<0.001) compared toprimary OA patients. Similar patterns of the three-dimensional endosteal canal shape of theproximal femur, but a high inter-individual variability for femoral canal torsion at the meta-diaphyseal level were found for DDH and primary OA patients.CONCLUSION: Standard cementless stem designs are suitable to treat patients with sec-ondary hip OA due to mild DDH; however, high patient variability and subtle anatomicaldifferences in the proximal femur should be respected.

AB - AIM: To investigate the three-dimensional anatomy and shape of the proximal femur,comparing patients with secondary osteoarthritis (OA) due to mild developmental dysplasia ofthe hip (DDH) and primary hip OA.MATERIALS AND METHODS: This retrospective radiographic computed tomography (CT)-based study investigated proximal femoral anatomy in a consecutive series of 84 patients withsecondary hip OA due to mild DDH (Crowe type I&II/Hartofilakidis A) compared to 84 patientswith primary hip OA, matched for gender, age at surgery, and body mass index.RESULTS: Men with DDH showed higher neck shaft angles (1275vs. 1234;p<0.001),whereas women with DDH had a larger femoral head diameter (464vs.443 mm;p¼0.002),smaller femoral offset (365 vs. 404 mm;p<0.001), decreased leg torsion (2513vs.3116;p¼0.037), and a higher neck shaft angle (1287vs. 1234;p<0.001) compared toprimary OA patients. Similar patterns of the three-dimensional endosteal canal shape of theproximal femur, but a high inter-individual variability for femoral canal torsion at the meta-diaphyseal level were found for DDH and primary OA patients.CONCLUSION: Standard cementless stem designs are suitable to treat patients with sec-ondary hip OA due to mild DDH; however, high patient variability and subtle anatomicaldifferences in the proximal femur should be respected.

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