FRI0390 IMPACT OF ULTRASONOGRAPHY‑DETECTED QUADRICEPS CALCIFIC TENDONITIS ON PAIN AND FUNCTION IN PATIENTS WITH PRIMARY KNEE OSTEOARTHRITIS

Background: Calcific tendonitis is most commonly seen around shoulder joint. Few cases of quadriceps calcific tendonitis (QCT) of were reported. Routine use of ultrasonography in diagnosis of knee osteoarthritis has resulted in detection of many cases of QCT. Up to the best of our knowledge, this is the first study to detect impact of QCT in knee osteoarthritis by ultrasonography. Objectives: To compare pain, function, and clinical and radiological findings among primary KOA patients with or without ultrasonography-detected QCT. Methods: A prospective, observational study study was conducted on 214 patients with knee OA in the period between february 2019 to july 2019. Ultrasonography of knee joints was done according to EULAR guidelines. Quadriceps calcific tendonitis is defined as hyperechoic mass within the quadriceps tendon with posterior shadowing. The patients were categorized into two groups according to the presence or absence of QCT. Radiological grades of Kellgren–Lawrence were recorded. Pain and functional status was assessed by visual analog scale (VAS), Health Assessment Questionnaire-II (HAQ-II), and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) Results: QCT were detected in 25 (11.6%) patients. Most cases of QCT were detected in vastus lateralis 18 (72%), then in vastus intermedius 5 (20%) and only 2 cases were detected in vastus medialis. QCT were detected mainly in advanced stages of knee OA; 22 cases of QCT were found in patients with grade 4 KOA. The presence of QCT was statistically significant related (P Conclusion: Quadriceps calcific tendonitis is not rare. Ultrasonography can detect QCT in many cases with advanced knee OA. QCT is associated with increased pain and dysfunction in knee OA References: None Disclosure of Interests: None declared