Table 2.
Quality of life in patients with persistent pain after knee arthroplasty: nonneuropathic versus neuropathic pain*
| Variable | PPSP group (n = 53) | Neuropathic PPSP group (n = 12) | p value |
|---|---|---|---|
| DN4 score (0–10 points)† | 1 (0–3) | 4.5 (4–5.5) | < 0.001 |
| Pain (number of patients) | |||
| At rest | 32 (60%) | 8 (75%) | 0.754 |
| At mobilization | 45 (85%) | 12 (100%) | 0.333 |
| At rest and mobilization | 24 (45%) | 8 (75%) | 0.215 |
| NRS pain score (0–10 points; 0 = no pain, 10 = worst pain)† | |||
| Maximum | 4 (2.5–5) | 5.5 (4–6.5) | 0.126 |
| Minimum | 0 (0–0) | 0 (0–2) | 0.005 |
| Average | 1 (0–2) | 3 (1–3.5) | 0.027 |
| Pain impact on the quality of life (NRS: 0–10 points; 0 = no impact, 10 = worst impact)† | |||
| Mood | 0 (0–0) | 0 (0–5.5) | 0.008 |
| Social life | 0 (0–0) | 0 (0–2) | 0.026 |
| Walking capacity | 0 (0–3) | 3 (0–5.5) | 0.081 |
| Common work tasks | 0 (0–3) | 3 (2–5) | 0.004 |
| Sleep quality | 0 (0–2) | 0 (0–4) | 0.680 |
| Analgesics intake (number of patients) | 25 (47%) | 8 (67%) | |
| Pain-relieving effect (%)† | 60 (50–70) | 40 (30–50) | 0.085 |
* Neuropathic pain versus nonneuropathic pain was determined according to the score on DN4 questionnaire; † values are expressed as median, with interquartile range in parentheses; PPSP = persistent postsurgical pain; DN4 = Douleur Neuropathique 4 [Neuropathic Pain 4]; NRS = numerical rating scale.