https://cdnph.upi.com/ph/st/th/9481786637636/2026/upi/c58131906becb5dc58099bc5844580fe/v1.5/49ers-Ricky-Pearsall-gets-knee-surgery-eyes-nine-month-recovery.jpg" /> San Francisco 49ers wide receiver Ricky Pearsall underwent knee surgery and targets a nine-month recovery, he announced Thursday on Instagram.