Factors associated with prognosis of lateral epicondylitis after 8 weeks of physical therapy.

OBJECTIVE

To identify key factors associated with outcomes of patients who underwent 8 weeks of physical therapy (PT) for lateral epicondylitis.

DESIGN

Multicenter prospective design with inception cohort of lateral epicondylitis patients commencing PT. Baseline clinical examinations were conducted by 1 physical therapist; self-report outcome measures were completed at baseline and 8 weeks later.

SETTING

Nine private sports medicine clinics and 2 hospital outpatient departments in Ontario, Canada.

PARTICIPANTS

Eighty-three patients with unilateral lateral epicondylitis identified by the treating physical therapists.

INTERVENTIONS: Not applicable.

MAIN OUTCOME MEASURES: The final scores of the Disability of the Arm, Shoulder and Hand (DASH) questionnaire and a vertical pain visual analog scale (VAS) were used as the dependent variables.

RESULTS

The final prognostic model for the 8-week DASH scores included the baseline score (95% confidence interval [CI], 0.34-0.66), sex (female) (95% CI, 3.3-14.5), and self-reported nerve symptoms (95% CI, 0.8-13.8). The model for the 8-week VAS scores included the baseline score (95% CI, 0.01-0.37), sex (female) (95% CI, 0.4-18.2), and self-reported nerve symptoms (95% CI, 4.7-25.5). A subanalysis indicated that women were more likely than men to have work-related onsets, repetitive keyboarding jobs, and cervical joint signs. Among women, these factors were associated with higher final DASH and VAS scores.

CONCLUSIONS

Women and patients who report nerve symptoms are more likely to experience a poorer short-term outcome after PT management of lateral epicondylitis. Work-related onsets, repetitive keyboarding jobs, and cervical joint signs have a prognostic influence on women.