Osteomyelitis following anterior cruciate ligament (ACL) reconstruction is extremely rare.We present a thirty year old man who presented with pain in his proximal tibia six years after ACL reconstruction. Haematological investigations were normal. He was diagnosed with osteomyelitis of his proximal tibia. He was successfully treated with washout and debridement of his tibial tunnel.This case highlights the need to exclude osteomyelitis as a late complication of ACL reconstruction in patients with proximal tibial pain. We also report on an unusual pathogen as casue of osteomyelitis.Osteomyelitis in a tibial tunnel can present as a late complication of ACL reconstruction, even in the presence of normal haematological investigations.