Post-traumatic Patellar Tendon Repair with Ipsilateral Peroneus Tendon Augmentation Post Total Knee Arthroplasty: A Case Report.

Patellar tendon rupture is an uncommon but serious complication that results in loss of knee extension during and after total knee arthroplasty (TKA), significantly impacting the patient's quality of life. Various surgical treatments, ranging from initial repair to reconstruction, are available and accessible. In recent years, the peroneus longus tendon autograft has been utilised to restore the knee extensor system. The purpose of this case report was to present the case of a patient who had a traumatic patellar tendon rupture following TKA and requiring surgery along with peroneus tendon augmentation. A 71-year-old woman underwent bilateral robotic-assisted cruciate retaining TKA for a Grade IV arthritic knee. Post surgery, on day five patient had a history of a fall at home, following which she was unable to extend her knees. On evaluation through ultrasonography and radiographs, she was found to have a ruptured patellar tendon and sprain of the medial collateral ligament. Primary repair of the tendon along with augmentation with the peroneus tendon was performed, and the patient was followed for 12 months, at the end of which, the patient was able to achieve a good functional outcome. In conclusion, early results from patellar tendon reconstruction using an ipsilateral peroneus longus tendon autograft following TKA suggest that this technique is effective for managing acute post-traumatic patellar tendon rupture. It facilitates early recovery, yields favourable outcomes, and may reduce the risk of infection.