Self-reported bio-psycho-social factors partially distinguish patellar tendinopathy from other knee problems and explain patellar tendinopathy severity in jumping athletes: A case-control study
Résumé
Objective: To determine what combinations of self-reported factors distinguish patellar tendinopathy (PT) from other knee problems, and explain PT severity variance. Design: Case-control study. Setting: Social media, private practice and National Health Service. Participants: An international sample of jumping athletes diagnosed with either PT (n ¼ 132; 30.7 ± 8.9 years; 80 males; VISA-P ¼ 61.6 ± 16.0) or another musculoskeletal knee condition (n ¼ 89; 31.8 ± 9.9 years; 47 males; VISA-P ¼ 62.9 ± 21.2) by a clinician in the last 6 months. Main outcome measures: We considered clinical diagnosis (case ¼ having PT vs control ¼ having other knee problems) as the dependent variable. Severity and sporting impact were defined by VISA-P and availability, respectively. Results: A model comprising seven factors distinguished PT from other knee problems; training duration (OR ¼ 1.10), sport type (OR ¼ 2.31), injured side (OR ¼ 2.28), pain onset (OR ¼ 1.97), morning pain (OR ¼ 1.89), condition acceptability (OR ¼ 0.39) and swelling (OR ¼ 0.37). Sports-specific function (OR ¼ 1.02) and player level (OR ¼ 4.11) explained sporting availability. 44% of PT severity variance was explained by quality of life (b ¼ 0.32), sports-specific function (b ¼ 0.38) and age (b ¼ À0.17). Conclusion: Sports-specific, biomedical and psychological factors partially distinguish PT from other knee problems. Availability is mainly explained by sports-specific factors, while psychosocial factors impact on
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