coding for knee surgery

good morning,

our surgeon did a meniscectomy (arthroscopic) (29881), but the trouble I am having is coding:

1) posterolateral corner reconstruction using tibialis anterior allograft (open) and:
2) proximal tibial fibular stabilization with autograft gracilis tendon (open).

Surgery was done for meniscal tear, posterolateral corner laxity and proximal tibial fibular instability...

Thank you so much for your assistance....