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Table 1 Prevalence of CRPS-like signs (allodynia, unweighting, warmth, and edema) observed at 4 weeks and 16 weeks post fracture in fracture rats. The arbitrary criteria indicate approximately 30-50 % normalization of each measurement.

From: Acute versus chronic phase mechanisms in a rat model of CRPS

Signs Allodynia Unweighting Warmth Edema
Criteria R-L difference 2R/(R + L) × 100 % R-L difference R-L difference
Diagnostic threshold: 5-g reduction Diagnostic threshold: 30 % reduction Diagnostic threshold: 1 °C increase Diagnostic threshold: 0.5-mm increase
FX- 4 WK 90 %
(42/47)
87 %
(33/38)
94 %
(44/47)
73 %
(32/44)
FX- 16 WK 72 %
(34/47)
2 %
(1/47)
19 %
(9/47)
0 %
(0/47)
  1. R right hindpaw, L left hindpaw, FX- 4 WK 4 weeks after fracture, FX- 16 WK 16 weeks after fracture