Purpose
To compare the prevalence of femoroacetabular impingement (FAI) radiographic findings
between patients aged younger than 50 years and those aged 50 years or older who underwent
total hip arthroplasty.
Methods
Total hip arthroplasty patients aged younger than 50 years and those aged 50 years
or older were identified retrospectively from a facility medical record database.
Fifty patients from each group were randomly selected, and preoperative radiographs
were collected. Dysplastic, inflammatory, post-traumatic, and osteonecrosis patients
were excluded. Radiographs were evaluated for FAI-specific findings. Intraobserver
and interobserver reliability was evaluated with κ statistics for categorical variables
and intraclass correlation coefficients for continuous variables. An independent t test was used to compare continuous variables, χ2 analysis was used for discrete variables, and a z ratio was used to analyze proportions.
Results
The mean age between the subgroups of patients aged younger than 50 years and those
aged 50 years or older (43 years and 68 years, respectively) was significantly different
(P < .05). Findings in the subgroup aged younger than 50 years included significantly
more men (P < .001), decreased lateral joint space with maintained medial joint space (P < .05), significantly greater alpha angle on both the anteroposterior view and the
frog-leg lateral view (P < .05), significantly higher Tönnis and Sharp angles (P < .01), and significantly lower center-edge angle (P < .001).
Conclusions
This retrospective case series shows an increased prevalence of FAI findings (specifically
cam pathology) in a patient population aged younger than 50 years undergoing total
hip arthroplasty when compared with a cohort aged 50 years or older.
Level of Evidence
Level III, retrospective comparative study.
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Article info
Publication history
Accepted:
April 16,
2013
Received:
October 10,
2012
Footnotes
The authors report that they have no conflicts of interest in the authorship and publication of this article.
Identification
Copyright
© 2013 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
