The Optimal Timing of Platelet-Rich Plasma (PRP) Injection for Nerve Lesion Recovery: A Preliminary Study

Table 4

Post hoc analysis comparing various groups of treatment with respect to endoneurium vacuoles found on histopathologic analysis.

Treatment groups	Mean ± SD	P value
Control and immediately after injury	15.7 ± 9.5 and 33.6 ± 29	0.149^a
Control and 3 days after nerve injury	15.7 ± 9.5 and 56.6 ± 11.6	0.002^a
Control and 7 days after nerve injury	15.7 ± 9.5 and 39.6 ± 25.3	0.003^b
Control and 14 days after nerve injury	15.7 ± 9.5 and 5.2 ± 1.6	0.023^b
Immediately after injury and 3 days after nerve injury	33.6 ± 29 and 56.6 ± 11.6	0.023^a
Immediately after injury and 7 days after nerve injury	33.6 ± 29 and 39.6 ± 25.3	0.774^a
Immediately after injury and 14 days after nerve injury	33.6 ± 29 and 5.2 ± 1.6	0.020^a
3 days and 7 days after nerve injury	56.6 ± 11.6 and 14 ± 6.7	0.003^a
3 days and 14 days after nerve injury	56.6 ± 11.6 and 5.2 ± 1.6	0.002^a
7 days and 14 days after nerve injury	39.6 ± 25.3 and 5.2 ± 1.6	0.003^b

^aMann–Whitney. ^bIndependent sample test. Significant difference ().