Abstract Objective This study investigates the effect of partial common extensor tendon(CET) tears on demographic, clinical and ultrasound(US) parameters in patients with lateral epicondylitis(LE). The research aimed to provide a comprehensive understanding of how these US-detected partial tears, influence the clinical presentation and imaging findings associated with LE. Design Retrospective cross-sectional study. Records of 227 patients with LE met the inclusion-exclusion criteria were reviewed. The patient-rated tennis elbow evaluation(PRTEE) questionnaire was used as the primary outcome measure. Secondary outcome measures were visual analogue scale for pain, algometric measurements, hand grip strength, and US parameters(maximum tendon thickness measurements from the capitellar-radiocapitellar sides and presence of bone abnormalities). Results Partial CET tears detected using US were present in 22.7%(n = 54) of the patients. Patients with partial CET tears were older(50,31±9,22), had higher PRTEE scores(65,48±12,76), capitellar-radiocapitellar maximum tendon thickness measurements(0,60±0,80/0,60±0,72), and incidence of bone abnormalities(%40.7,n = 32)(p < .05). Logistic regression analysis identified age and PRTEE pain score as associative factors with partial CET tears. Capitellar-radiocapitellar maximum tendon thickness measurements greater than 0.55 cm were associated with an increased probability of partial CET tears. Conclusion US-detected partial CET tears may worsen the clinical and US parameters in patients with LE. Older age, higher PRTEE scores and higher maximum tendon thickness measurements were associated with partial CET tears.
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