Table 1.
Baseline characteristics of included patients (n = 282).
| Study population | |
|---|---|
| Patient characteristics | |
| Age in years, median (IQR) | 32 (26–39) |
| Male gender | 178 (63%) |
| Body mass index, median (IQR) | 24.6 (22.7–26.9) |
| High educational level | 117 (41%) |
| Musculoskeletal comorbidities | 63 (22%) |
| Previous knee complaints | 116 (41%) |
| Time from trauma to study inclusion in days, median (IQR) | 39 (13–80) |
| Symptom on the right knee | 128 (45%) |
| Sports before trauma | 282 (100%) |
| Hours spent on sport per week, median (IQR) | 3 (2–5) |
| Ball sport | 126 (45%) |
| Sport in competition | 124 (44%) |
| Soccer | 99 (35%) |
| Fitness training/aerobics | 60 (21%) |
| Athletics/running | 40 (14%) |
| Combat sport | 16 (6%) |
| Paid job before trauma | 252 (89%) |
| Hours spent on paid job per week, median (IQR) | 38 (30–40) |
| Trauma characteristics | |
| Occasion of trauma | |
| During sports | 188 (67%) |
| During work | 18 (6%) |
| At home | 12 (4%) |
| During traffic | 24 (9%) |
| Other | 40 (14%) |
| Mechanism of trauma | |
| Fall | 72 (26%) |
| Rotation | 114 (40%) |
| Bump | 19 (7%) |
| Squatting | 24 (9%) |
| Other | 51 (18%) |
| Immediate pain | 208 (74%) |
| Immediate effusion | 72 (26%) |
| Continuation activity impossible | 196 (70%) |
| Popping sensation during trauma | 89 (35%) |
| Severity of knee complaints | |
| Invited afterward consultation | 106 (38%) |
| Severity of knee pain (NPRS previous 48 h), median (IQR) | 3 (5–7) |
| Symptoms and limitations in activities (Lysholm), median (IQR) | 73 (56–85) |
| Workload and sport participation (Tegnér), median (IQR) | 3 (2–4) |
| Fear of pain, movement and injury (TSK-11), median (IQR) | 26 (22–30) |
| KOOS pain, median (IQR) | 58.3 (44.4–75) |
| KOOS symptoms, median (IQR) | 64.3 (46.4–78.6) |
| KOOS function in daily living, median (IQR) | 69.1 (50–85.7) |
| KOOS sport and recreation, median (IQR) | 30 (15–55) |
| KOOS quality of life, median (IQR) | 43.8 (37.5–50) |
Data are presented as numbers (percentages), unless otherwise stated. Missing values ranged up to 0.7%. NPRS, numeric pain rating scale with scores from 0–10, with a higher score indicating more pain. Lysholm scale scored from 0–100, with a higher score indicating fewer problems. TSK-11: Shortened version of the Tampa scale for kinesiophobia scored from 11 to 44, with a higher score indicating more kinesiophobia. KOOS, knee injury and osteoarthritis outcome score ranging from 0 to 100, with a higher score indicating fewer problems. IQR: interquartile range.