A rare childhood injury is a combined tibial tubercle fracture and patellar tendon rupture, and this condition necessitates an open surgical procedure to perform a stable fixation of the tubercle fragment and a successful patellar tendon repair. When a tibial tubercle fracture in the tibia is present alone, a high index of suspicion is required. In this article, we described a case of a male teen who suffered a neglected patellar tendon rupture following close reduction and fixation of a tibial tubercle fracture.