The Influence of Hip Rotation on Femoral Offset in Plain Radiographs

Overview

Journal Acta Orthop

Specialty Orthopedics

Date 2014 Jun 24

PMID 24954484

Citations 29

Authors

Philipp Lechler

Michael Frink

Aashish Gulati

David Murray

Tobias Renkawitz

Benjamin Bucking

Steffen Ruchholtz

Christoph Kolja Boese

Affiliations

Soon will be listed here.

Abstract

Background And Purpose: Adequate restoration of femoral offset (FO) is critical for successful outcome after hip arthroplasty or fixation of hip fracture. Previous studies have identified that hip rotation influences the projected femoral offset (FOP) on plain anteroposterior (AP) radiographs, but the precise effect of rotation is unknown.

Patients And Methods: We developed a novel method of assessing rotation-corrected femoral offset (FORC), tested its clinical application in 222 AP hip radiographs following proximal femoral nailing, and validated it in 25 cases with corresponding computed tomography (CT) scans.

Results: The mean FORC was 57 (29-93) mm, which differed significantly (p < 0.001) from the mean FOP 49 (22-65) mm and from the mean femoral offset determined by the standard method: 49 (23-66) mm. FORC correlated closely with femoral offset assessed by CT (FOCT); the Spearman correlation coefficient was 0.94 (95% CI: 0.88-0.97). The intraclass correlation coefficient for the assessment of FORC by AP hip radiographs correlating the repeated measurements of 1 observer and of 2 independent blinded observers was 1.0 and 1.0, respectively.

Interpretation: Hip rotation affects the FOP on plain AP radiographs of the hip in a predictable way and should be adequately accounted for.

Citing Articles

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A framework for three-dimensional statistical shape modeling of the proximal femur in Legg-Calvé-Perthes disease.

Johnson L, Mozingo J, Atkins P, Schwab S, Morris A, Elhabian S Int J Comput Assist Radiol Surg. 2024; .

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Radiological assessment of hip disease in children with cerebral palsy: development of a core measurement set.

Joseph P, Khattak M, Masudi S, Minta L, Perry D Bone Jt Open. 2023; 4(11):825-831.

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Comparison between Hip Internal Rotation Assistive Device and Conventional Radiograph Positioning: An Experimental Study.

Sirithiantong T, Sukhapanon T, Cheewatanakornkul R Malays Orthop J. 2023; 16(3):6-10.

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Femoral neck shaft angle measurement on plain radiography: is standing or supine radiograph a reliable template for the contralateral femur?.

Haddad B, Hamdan M, Al Nawaiseh M, Aldowekat O, Alshrouf M, Karam A BMC Musculoskelet Disord. 2022; 23(1):1092.

PMID: 36514028 PMC: 9749307. DOI: 10.1186/s12891-022-06071-5.

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