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. 2025 Jan 10;16(1):9.
doi: 10.1186/s13244-024-01880-9.

Fluoroscopy-guided aspiration of the acutely dislocated total hip arthroplasty: a feasible, high-yield, and safe procedure

Dyan V Flores  1   2   3 , Abdullah Felemban  4 , Taryn Hodgdon  1   2   3 , Paul Beaulé  3   5 , George Grammatopoulos  3   5 , Kawan S Rakhra  6   7   8
Affiliations

Fluoroscopy-guided aspiration of the acutely dislocated total hip arthroplasty: a feasible, high-yield, and safe procedure

Dyan V Flores et al. Insights Imaging. .

Erratum in

Abstract

Objective: To determine the feasibility, yield, and safety of fluoroscopic-guided aspiration of the acutely dislocated total hip arthroplasty (AD-THA).

Materials and methods: IRB-approved, retrospective review of fluoroscopic-guided aspirations of AD-THA (January 2005-December 2023) was performed. Data from electronic charts and fluoroscopy images/reports were obtained. Positive yield was defined as spontaneous aspirate or saline rinse adequate for microbiology analysis. Sub-analysis by needle target (acetabular cup or femur) was performed for spontaneous aspiration rate, aspirate volume and fluoroscopy time. Differences between groups were analyzed with unpaired, t-test (2-tail) and between proportions with Fisher's exact test, with significance p < 0.05.

Results: Aspiration of 20 AD-THA in 19 patients (12 female, mean age (SD) of 73 years (16)) targeted the acetabular cup in 45% (9/20) or femur in 55% (11/20) of cases. Positive yield was obtained in 95% (19/20), with spontaneous aspirate in 75% (15/20) and saline rinse in 20% (4/20) of cases; in 5% (1/20), no diagnostic sample was obtained. Spontaneous aspirate mean volume (SD, range) for all cases was 8.3 mL (6.9, 0.2-25), and higher when targeting the acetabular cup 11.2 mL (6.9, 5-25) versus the femur 4.0 mL (4.4, 0.2-12) (p = 0.026). The rate of spontaneous aspiration was higher for the acetabular cup 100% (9/9) versus the femur 55% (6/11) (p = 0.038). The mean fluoroscopy time (SD, range) for all cases was 43 s (25, 19-102), and shorter for targeting the acetabular cup 32 s (16, 19-75) versus the femur 56 s (28, 28-102) (p = 0.034). No immediate complications occurred in all aspirations.

Conclusion: Fluoroscopy-guided aspiration of AD-THA is a feasible, high-yield, and safe procedure. Targeting the acetabular cup results in a higher rate of spontaneous aspirate, larger aspiration volume, and lower fluoroscopy time.

Critical relevance statement: Although technically more challenging, radiologists should feel confident aspirating the acutely dislocated total hip arthroplasty (AD-THA) under fluoroscopic guidance.

Key points: Total hip arthroplasty (THA) infection can be evaluated with synovial fluid aspiration. Fluoroscopic-guided aspiration of the dislocated THA is feasible, high-yield, and safe. Targeting of the acetabular cup is recommended over the femoral prosthetic component. Acetabular cup targeting gives larger, spontaneous aspirates with lower fluoroscopy time.

Keywords: Dislocation; Fluoroscopy; Image-guided hip aspiration; Intervention; Total hip arthroplasty.

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Conflict of interest statement

Declarations. Ethics approval and consent to participate: Approval by the Ottawa Hospital Research Institute Research Ethics Board was obtained (OHSN-REB Protocol #: 20220692-01H). Written informed consent was waived by the Ottawa Hospital Research Institute Research Ethics Board. Consent for publication: Not applicable. Competing interests: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

Figures

Fig. 1
Fig. 1
Intraprocedural images demonstrating target site of needle in two patients who underwent fluoroscopic-guided hip aspiration to rule out infection (a, b). Acetabular cup approach (a) is shown in a 49-year-old female. 25 cc serosanguinous fluid was directly aspirated. Femur approach (b) is shown in a 49-year-old female. 2 cc blood-tinged fluid was directly aspirated. Both samples were deemed adequate for microbiologic analysis
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