Abstract : <p>Reconstruction of the medial patellofemoral ligament (MPFL) is the most common treatment for patellar instability. Use of the ipsilateral quadriceps’ tendon was described for reconstruction of the MPFL. The present study aimed to evaluate the clinical outcome of MPFL reconstruction using a quadriceps tendon for patellofemoral instability. This prospective study was conducted on 25 patients with patellar dislocation, patellofemoral subluxation or failed previous procedure for treatment of patellar instability. Preoperatively diagnostic arthroscopy was performed to rule out intra-articular injuries. The operative procedure was performed as previously described. Postoperatively, patients were gradually allowed to full weight bearing and were submitted to physiotherapy. At the intervals of 6 months 1 years and 2 years, patients were assessed for operative outcome using Lysholm knee score. Comparing the operative outcome at various follow up points showed significant improvement of Lysholm knee score from 6 months postoperatively onwards.  The most frequently reported complications included anterior knee pain (40.0 %), haematoma (20.0 %), redislocation (4.0 %) and Sudeck's atrophy (4.0 %). In conclusion, MPFL reconstruction using a quadriceps tendon for patellofemoral instability is effective procedure with excellent safety profile.</p>