A Novel Technique Utilizing a Vastus Lateralis Anchor in Treatment of Chronic Patellar Dislocation After Total Knee Arthroplasty

Extensor mechanism complications involving the patella frequently result in total knee arthroplasty (TKA) failure. Postoperative patellar dislocation may be caused by soft tissue imbalance, improper sizing, and position of the prosthesis. This report describes a case of revision TKA requiring several rounds of soft tissue releases in an effort to treat the patient’s chronic patellar dislocation. In the process, a novel surgical approach was developed for the surgical management of refractory chronic patellar dislocations. Postoperative follow-up at 1, 2, 6, 12, and 24 months indicated no complaints of patellar subluxation or dislocation. Plain films also demonstrated no effusion, fracture, or patellar dislocation on sunrise, anteroposterior, and lateral views. This novel anatomic repositioning of the vastus lateralis around the quadriceps tendon converted a pathologic lateralizing force into a medial stabilizer. On follow-up evaluations, successful patellar tracking without dislocation has been demonstrated. (Journal of Surgical Orthopaedic Advances 26(3):166–172, 2017)
Key words: extensor mechanism complications, novel surgical technique, patellar maltracking, revision total knee arthroplasty, total knee arthroplasty, vastus lateralis release