Table 4.
Short-term and longer-term prediction of response to IASI in subsample†.
| Predictor Variable in Regression | Short-term Responder (Yes/No) | Longer-term Responder (Yes/No) |
|---|---|---|
| Relative Risk (95% CI) | Relative Risk (95% CI) | |
| Previous ligament/meniscus injuries, frequency (%) | ||
| No | Reference category | Reference category |
| Yes | 0.63 (0.44–0.91) | 0.86 (0.35–2.10) |
| Crepitus¤ | ||
| Absent | Ref. | Ref. |
| Audible and/or palpable | 1.17 (0.66–2.08) | 1.33 (0.21–8.26) |
| Quadriceps muscle wasting¤ | ||
| Absent | Ref. | Ref. |
| Possible | 1.37 (1.05–1.79) | 2.01 (0.62–6.53) |
| Present | 1.10 (0.83–1.47) | 1.75 (0.63–4.87) |
| Bony enlargement¤ | ||
| Absent | Ref. | Ref. |
| Unsure | 1.05 (0.76–1.46) | 0.55 (0.08–3.57) |
| Present | 0.86 (0.68–1.09) | 0.68 (0.30–1.52) |
| Anserine tenderness | ||
| Absent | Ref. | Ref. |
| Present | 1.27 (1.06–1.52) | 1.14 (0.50–2.59) |
| Patellofemoral tenderness | ||
| Absent | Ref. | Ref. |
| Present | 1.27 (1.04–1.55) | 0.97 (0.46–2.06) |
| Tibiofemoral tenderness | ||
| Absent | Ref. | Ref. |
| Lateral tibiofemoral joint | 1.26 (0.86–1.84) | 2.51 (0.91–6.96) |
| Medial tibiofemoral joint* | 1.42 (1.10–1.82) | 1.22 (0.45–3.27) |
| Medial and lateral tibiofemoral joint | 1.38 (1.03–1.84) | 1.96 (0.73–5.31) |
| Ballottement | ||
| Absent | Ref. | Ref. |
| Present with or without click | 0.83 (0.61–1.12) | 0.32 (0.08–1.27) |
| Bulge sign¤ | ||
| 0 | Ref. | Ref. |
| Trace | 1.00 (0.79–1.26) | 1.00 (0.42–2.36) |
| 1 | 0.94 (0.68–1.30) | 0.55 (0.13–2.29) |
| 2 | 0.83 (0.54–1.28) | 1.09 (0.35–3.47) |
| 3 | 0.83 (0.37–1.89) | 1.46 (0.26–8.08) |
| Quadriceps muscle strength, Nm/kg | 0.92 (0.74–1.16) | 1.45 (0.73–2.85) |
| Knee range of movement, degrees | ||
| Flexion (0–180) | 1.00 (0.99–1.01) | 1.01 (0.98–1.04) |
| Extension (0–180) | 1.00 (0.98–1.02) | 1.01 (0.94–1.09) |
†
N = 101 in all variables apart from quadriceps muscle strength, where n = 98 was due to size of limb being too large to allow testing in 3 participants.
¤
Further testing done using pairwise comparisons for equality by creating dummy variable coding confirms nonsignificance.
*
Further testing done using pairwise comparisons for equality by creating dummy variable coding confirms medial tibiofemoral joint tenderness improved response at short-term only. IASI: intraarticular steroid injection.