Objective: To compare the outcome of patella fractures fixed by biodegradable tension band fixation(BTB) with Biofix rods and Biopoly ligaments and metallic tension band (MTB)with Kirschner wire and metallic cerclage wire in a randomized study. Methods:Thirty-eight patients(18 with BTB and 20 with MTB) were treated in this group. The follow-up time was 24 (14-32) months. The results were evaluated by radiography and recovery of joint function. Results: The fractures healed in all patients after a mean time of 8 weeks. In BTB group, the clinical outcome was good in 13 patients, fair in 4, and poor in 1. In MTB group, the corresponding figures were 15, 3 and 2. There was no clinical differences between the two methods. Conclusion: Patella fractures can be treated successfully by using biodegradable tension band fixation with no need for a second operation to remove the implants.