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The increase in posterior-anterior knee joint stiffness, in combination with increased hamstring activation, is an important finding for prevention and rehabilitation of knee joint injuries such as anterior cruciate ligament deficiencies.
PLCO patients, aged 55-74 years, were randomly assigned from November 1993 to July 2001 to annual screening with posterior-anterior view chest radiographs for 4 years or usual care.
They were followed biannually with medical history and physical examinations, hematologic and blood chemistry analysis, and posterior-anterior chest x-rays.