Introduction. Bilateral patellar tendon rupture is rare injury, with only sporadic cases reported in the literature. Systemic diseases, such as Systemic Lupus Erythematosus, and corticosteroid administration are significant risk factors for this injury, as they contribute to collagen fiber deterioration in the tendon. Rupture of the patellar tendon disrupts the knee’s extensor mechanism, often requiring surgical intervention. Case report. This article presents the case of a 50-year-old female with a history of Systemic Lupus Erythematosus and periodic corticosteroid treatment, who presented with instability in both knee joints. Clinical examination revealed dysfunction of the extensor mechanism and high-riding patella bilaterally. This condition was confirmed by radiography, with the Insall-Salvati Ratio measuring 2.11 on the right knee and 1.94 on the left knee. Magnetic resonance imaging confirmed a high-grade partial rupture of both patellar tendons. Surgical intervention was indicated, leading to a combined repair of the right patellar tendon. The technique involved primary suturing combined with augmentation using internal bracing method. Stable fixation was achieved, however, a complication of lateral anchor migration occurred one month postoperatively. Despite this, the extensor mechanism integrity remained preserved. Conclusions. Bilateral patellar tendon rupture should be suspected in patients presenting with impaired knee extensor function. Diagnosis relies primarily on lateral knee radiography (at 30° flexion), with magnetic resonance imaging used for confirmation. Complete and high-grade partial ruptures should be managed surgically. Optimal postoperative rehabilitation protocols require further investigation.
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