Patellar Osteoid Osteoma: A Rare Cause for Anterior Knee Pain.

Introduction: Osteoid osteoma is a benign osteoblastic lesion occurring in the diaphysis of the long bones most commonly. Patellar osteoid osteoma is very rare and most commonly associated with anterior knee pain.

Case report: A 21-year-old male presenting with anterior knee pain was diagnosed to have patellar osteoid osteoma after 4 years of onset of symptoms and was treated with radiofrequency ablation. One year following the ablation patient remains pain-free and has a complete range of movements.

Conclusion: Atypical location of the tumor makes it difficult to diagnose resulting in delayed management. Hence, it is important to have patellar osteoid osteoma as one of the differential diagnosis in patients having chronic anterior knee pain. Radiofrequency ablation is a novel and minimally invasive procedure for the treatment of Patellar Osteoid Osteoma which can help in resolution of anterior knee pain.