Woods suffered "comminuted open fractures affecting both the upper and lower tibia and fibula" said Dr. Anish Mahajan, interim CEO and chief medical officer of Harbor-UCLA Hospital, where Woods was taken to the trauma center and treated.
"Comminuted" means there were multiple fragments of the tibia and fibula shattering, ESPN injury analyst Stephania Bell said on the network Wednesday morning. "Open fractures" are otherwise known as compound fractures, meaning the bone has gone through the skin.
Doctors placed a rod through the tibia (goal is that bone heals around it), with a "combination of screws and pins" to stabilize additional bones in the ankle and foot, indicating multiple injuries there.
"Surgery takes a long time because they have to put the right tension on it, they have to reposition," Bell said. "They're trying to get anatomical alignment."
Furthermore, trauma to nearby muscle and soft tissue required doctors to "surgically release" the muscle to reduce swelling. That is done to reduce nerve or blood vessel damage, Bell said, and is common during "high-energy" injuries, such as those suffered during a high-speed car accident.
Bell said Woods should be monitored for infection, which is always a potential issue for open wounds, but that doctors likely have him on antibiotics and thoroughly cleaned the area before and while caring for Woods.
Bell added that a trauma center usually prioritizes the most dire injuries, and that more surgeries could be required for the golfing legend.
Los Angeles County Fire Chief Daryl Osby told reporters Tuesday that responders told him there were injuries to both legs, although the extent of the injuries to the left leg remains unknown.
Woods underwent his fifth back surgery in December and has previously had his spine fused. Bell said recovery would look like "months, not weeks" based on the initial release of information.