Patellar biomechanics.
The patella is an important functional component of the knee extension mechanism. It accounts for 13 to 30% of the knee extensors' moment arm. Functional deficits owing to patellectomy include decreased knee extension power, extension lag, instability, chronic effusion, decreased stance phase flexion, alteration of the path of instant flexion centers and decreased flexion range.
D001696:Biomechanical Phenomena; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D009068:Movement; D010329:Patella / Q000502:physiology* / Q000601:surgery; D011183:Postoperative Complications