Prosthetic Joint Infection
Conditions
Brief summary
Diagnosis of chronic prosthetic joint infection (PJI) can be difficult. 68Ga-citrate Positron Emission Tomography/Computed Tomography (PET/CT) has been recently developed and has many advantages such as high resolution and low radiation exposure. To date, 68Ga-citrate PET/CT has not been specifically assessed in prosthetic joint infection. In this prospective study, patients referred for a suspected PJI will benefit from both a 68Ga-citrate PET/CT and a 99mTc-HMPAO-labelled leukocyte SPECT/CT. The primary outcome is the assessment of the 68Ga-citrate PET/CT accuracy for the diagnosis of chronic prosthetic hip or knee infection.
Detailed description
Prosthetic joint infection (PJI) is a serious and rare complication of orthopedic surgery. Diagnosis is based on precise criteria (MSIS criteria Musculoskeletal Infection Society). However, diagnosis can be difficult, in particular when the infection is present for more than one month. One of the usual exams is bone scintigraphy and 99mTc-HMPAO-labelled leukocyte scintigraphy. This imaging allows an accurate assessment but it has some limitations since it requires ex vivo isolation and marking of patient's leukocytes and repeated acquisition for 24 hours. 68Gallium-citrate positron emission tomography/computed tomography (68Ga-citrate PET/CT) has been recently developed. 68Ga-citrate PET/CT is innovative compared to \[18F\]fluorodeoxyglucose PET/CT (18F-FDG PET/CT) and has many advantages: high resolution, realization in only two hours, short radioactive period and no handling of patient's leukocytes. Furthermore, preliminary data indicate that 68Ga-citrate is picked up by immune cells, which makes this exam inflammation-selective. To date, 68Ga-citrate PET/CT has not been specifically assessed in PJI, it is the objective of the present study: Prospective study using 68Ga- citrate PET/CT and a 99mTc-HMPAO-labelled leukocyte SPECT/CT. Patients referred for a suspected PJI and with a positive bone scintigraphy will be prospectively enrolled. After information and signature of informed consent, patients will benefit from a 68Ga citrate PET/CT, in addition to leukocyte scintigraphy in a two-week period. Both images will be anonymized and interpreted by two independent nuclear physicians. Final PJI diagnosis is based on reference criteria (MSIS) to ensure diagnosis during the standardized medical follow-up. Patients will be followed until 12 months after the leukocyte scintigraphy.
Interventions
DIAGNOSTIC_TEST68Ga-citrate PET/CT
PET/CT Imaging with 68Ga-citrate PET/CT injection
Sponsors
University Hospital, Bordeaux
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Patient aged over 18 years old * Patient referred for the first time to the South-Western France referral center for complex bone and joint infections (Crioac GSO, infectious diseases and orthopedic surgery units) for suspicion of prosthetic hip or knee infection. * Suspicion of prosthetic joint infection evolving for more than one month. * Patient for who routine diagnosis includes both bone scintigraphy and leukocytes scintigraphy. * Patient with positive bone scintigraphy. * Being affiliated to a health insurance system * Having signed an informed consent form (later than the day of inclusion and before any examination required by the research)
Exclusion criteria
* Patient with active cancer. * Patient with negative bone scintigraphy. * Patient who cannot stop antibiotics 14 days before exams. * Pregnant or breastfeeding women. * Women of childbearing age but not using effective means of contraception. * Patient concerned by articles L 1121-5 to L 1121-8 (persons deprived of their liberty by a judicial or administrative decision, minors, persons of legal age who are the object of a legal protection measure or unable to express their consent). * Subject in relative exclusion period from another study protocol. * Known contraindications to PET exam with radiopharmaceutical injection (hypersensitivity to radiopharmaceutical and/or to excipients).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Diagnostic accuracy of 68Ga citrate PET / CT scan CT for chronic prosthetic hip or knee infection | Up to 12 months after baseline (Day 0) | Sensibility, specificity, positive and negative predictive value. Index test : 68Ga citrate PET / CT scan CT at inclusion. Reference test : Musculoskeletal Infection Society (MSIS) criteria assessed up to 12 months after inclusion. After 12 months, participants will be considered free of chronic prosthetic hip or knee infection. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Diagnostic accuracy of quantitative 68Ga citrate PET / CT scan for chronic prosthetic hip or knee infection | Up to 12 months after baseline (Day 0) | Area under ROC curve (AUROC) for SUVmax ROI and SUVmax ROI/SVmax liver region ratio measured at inclusion. Reference test : Musculoskeletal Infection Society (MSIS) criteria assessed up to 12 months after inclusion. |
| Inter-observer reproducibility of 68Ga-citrate PET/CT interpretation | Up to 12 months after baseline (Day 0) | Intraclass correlation coefficient and/or Cohen's Kappa. |
| Diagnostic accuracy of leukocyte scintigraphy for chronic prosthetic hip or knee infection | Up to 12 months after baseline (Day 0) | Sensibility, specificity, positive and negative predictive values. Index test : leukocytes scintigraphy at inclusion. Reference test : Musculoskeletal Infection Society (MSIS) criteria assessed up to 12 months after inclusion. |
| Diagnosis accuracy of 68Ga-citrate PET/CT and leukocytes scintigraphy for chronic prosthetic hip or knee infection in the following sub-groups: prosthetic knee or hip infection. | Up to 12 months after baseline (Day 0) | Sensibility, specificity, positive and negative predictive values, in each subgroup. Index test : 68Ga citrate PET / CT scan CT at inclusion. Reference test : Musculoskeletal Infection Society (MSIS) criteria assessed up to 12 months after inclusion. After 12 months, participants will be considered free of chronic prosthetic hip or knee infection. |
| Comparison of diagnostic accuracy of 68Ga-PET/CT and leukocytes scintigraphy for chronic prosthetic hip or knee infection | Up to 12 months after baseline (Day 0) | Sensibility, specificity, positive and negative predictive values. Reference test : Musculoskeletal Infection Society (MSIS) criteria assessed up to 12 months after inclusion. Index test : 68Ga citrate PET / CT scan CT at inclusion and leukocytes scintigraphy at inclusion. |
Countries
France
Contacts
Primary ContactFrédéric-Antoine DAUCHY, MD
Backup ContactPauline PERREAU
Outcome results
None listed