Doctors said later the blast had shredded 80% of the bone and muscle on her left foot and ankle.
CNN: Boston bombings destroy dancer's foot, but not her spirit
Azarenka, ranked two in the world, was forced to withdraw with tendinitis and inflammation in her right foot and ankle.
Australian Test prop Josh Perry, hampered by foot and ankle injuries since making his move from Manly, made his delayed St Helens debut.
One new device, the iWalk prosthetic foot and ankle, uses a chip-controlled motor to propel amputees forward in the latest step toward robotic legs.
He spent the early part of this year recovering from foot and ankle surgery before suffering a side strain early in the Ashes tour.
The emergence of a new generation of tennis stars, led by Venus and Serena Williams, coincided with a series of foot and ankle injuries that saw Hingis slip down the rankings and eventually announce her retirement in 2002.
"In some cases, we can get four football fields of skin out of one baby foreskin, " said Dr. James McGuire, head of wound management at the Foot and Ankle Institute at the School of Podiatric Medicine at Temple University, in Philadelphia.
Osprey Byrne, who was replaced by Ireland's Rob Kearney when the Lions trailed 19-7, has a history of ankle and foot problems.
"He landed on John Brayford's foot in training, and his ankle went up like a balloon, " caretaker manager Dario Gradi told BBC Radio Stoke.
The popular bowler, who has also suffered ankle and foot injuries during his career, said he would not rush a decision over his long-term future.
Stephen Craigan and Steven Davis have been ruled out by groin injuries, Kyle Lafferty has a foot injury and George McCartney is out with an ankle problem.
The Gunners were rocked when Matthieu Flamini hesitated on the edge of the box, the ball found its way to Taylor and his side-foot shot arrowed into the corner via Gallas's ankle.
All-Star center Tyson Chandler (bulging disc), forwards Amare Stoudemire (knee surgery), Kenyon Martin (sprained ankle), Marcus Camby (plantar fasciitis) and Rasheed Wallace (broken foot) are all out.
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