Posterolateral arthrodesis in lumbar spine surgery using autologous platelet-rich plasma and cancellous bone substitute: an osteoinductive and osteoconductive effect.

The interaction with age was marginally significant (F(1,19) = 3.700, p = 0.72); the interaction between the levels (F(1,19) = 2.070, p = 0.169) and the platelet count (F(1,19)= 0.64, p = 0.804) was not significant, which suggests no effects of these variables on results.

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