Total Interobserver and Kappa (κ) Agreements Between Participating Staff and Fellows for Predictor Variables in 115 Patients Having Symptomatic Osteoarthritis of the Knee
| Variable | Agreement | |
|---|---|---|
| Overall, % | κ (and 95% confidence interval) | |
| History | ||
| Acute injury | 61 | 0.21 (0.03–0.39) |
| Swelling | 69 | 0.33 (0.17–0.49) |
| Giving way | 60 | 0.12 (−0.04–0.28) |
| Locking | 80 | 0.44 (0.26–0.62) |
| Pain | ||
| Generalized | 60 | −0.03 (−0.15–0.21) |
| Focal | 74 | 0.11 (−0.08–0.30) |
| At rest | 56 | 0.16 (0.0–0.32) |
| Rising from chair | 78 | 0.25 (0.05–0.45) |
| Climbing stairs | 90 | 0.21 (−0.06–0.48) |
| Physical findings | ||
| Tenderness | ||
| Medial joint line | 79 | 0.21 (0.01–0.41) |
| Lateral joint line | 70 | 0.25 (0.07–0.43) |
| Pain with passive motion | ||
| Full flexion: | 67 | 0.09 (−0.07–0.25) |
| Anteromedial | 59 | 0.14 (−0.05–0.33) |
| Posteromedial | 52 | 0.10 (−0.09–0.29) |
| Anterolateral | 65 | 0.18 (0.0–0.37) |
| Posterolateral | 72 | 0.05 (−0.17–0.27) |
| Full extension: | 57 | 0.10 (−0.08–0.28) |
| Anteromedial | 57 | 0.06 (−0.14–0.26) |
| Posteromedial | 48 | −0.02 (−0.22–0.18) |
| Anterolateral | 71 | 0.02 (0.0–0.40) |
| Posterolateral | 76 | 0.01 (−0.17–0.19) |
| Special tests | ||
| McMurray | 59 | 0.16 (−0.01–0.33) |
| Steinman | 52 | 0.05 (−0.11–0.21) |
| Circumduction | 63 | 0.21 (0.05–0.37) |
| Instability | ||
| Varus | 93 | 0 (−0.18–0.18) |
| Valgus | 92 | 0.05 (−0.13–0.23) |
| Lachman | 96 | −0.08 (−0.12–0.04) |
| Abnormal extension | 50 | 0.07 (−0.05–0.19) |
| Effusion | ||
| Visible | 72 | 0.28 (0.10–0.46) |
| Ballotment | 62 | 0.19 (0.02–0.36) |
| Sweep | 58 | 0.14 (−0.04–0.32) |
| Radiographic signs | ||
| 1-m standing | ||
| Tibiofemoral varus (≤4°) | 75 | 0.29 (0.13–0.45) |
| Medial joint space ≤2 mm | 80 | 0.63 (0.49–0.77) |
| Lateral joint space ≤3 mm | 86 | 0.72 (0.49–0.95) |
| 45° Posteroanterior weight bearing | ||
| Tibiofemoral varus (≤4°) | 88 | 0.63 (0.51–0.75) |
| Medial joint space ≤2 mm | 83 | 0.58 (0.44–0.72) |
| Lateral joint space ≤3 mm | 91 | 0.80 (0.62–0.98) |
| Clinician prediction* | 73 | 0.24 (0.04–0.44) |
↵* Clinician prediction of unstable meniscal tear after preoperative evaluation