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The article reports a study which was conducted to determine at which flexion angles the grafts should be fixed to best restore patellar stability for current medial patellofemoral ligament (MPFL) reconstruction during knee flexion in vivo. To obtain more patellar stability throughout range of knee motion, a femoral drill hole located at isometric points inside the anatomic MPFL attachment sites is suggested. The best angle for graft fixation would be near 30 degrees of knee flexion.

Abstract: Severe patellar infera accompanied by pathologic shortening and fibrosis of the patellar tendon is relatively an uncommmon condition but can cause recalcitrant joint stiffness and limited range of motion after knee surgery or injury. This report presents a case of a 49-year-old male with severe patellar infera and limping due to joint stiffness after three-time knee surgeries. We report a successful outcome along with a finding of the well-healed allograft after the reconstruction of a patellar tendon using Achilles tendon-bone allograft. [Copyright &y& Elsevier]