# Borrelia Arthritis - a Hidden Cause of Arthritis in Danish Patients?

> **NCT07351721** · — · NOT_YET_RECRUITING · sponsor: **Fredrikke Christie Knudtzen** · enrollment: 350 (estimated)

## Conditions studied

- Lyme Arthritis

## Interventions

- **DIAGNOSTIC_TEST:** Synovial fluid Borrelia burgdorferi PCR

## Key facts

- **NCT ID:** NCT07351721
- **Lead sponsor:** Fredrikke Christie Knudtzen
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** NOT_YET_RECRUITING
- **Start date:** 2026-01-01
- **Primary completion:** 2027-12-31
- **Final completion:** 2028-12-31
- **Target enrollment:** 350 (ESTIMATED)
- **Last updated:** 2026-01-20

## Collaborators

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT07351721

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT07351721, "Borrelia Arthritis - a Hidden Cause of Arthritis in Danish Patients?". Retrieved via AI Analytics 2026-06-09 from https://api.ai-analytics.org/clinical/NCT07351721. Licensed CC0.

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