Jack Draper: What is bone bruising & would surgery help former British number one?

British tennis player Jack Draper, 24, has withdrawn from a planned comeback at the Washington tournament after experiencing further discomfort from bone bruising in his serving arm. The injury follows a similar withdrawal from Wimbledon last month, where Draper also pulled out on the eve of the tournament despite initially positive fitness reports. BBC Sport's Ask Me Anything team has examined why surgery is not considered a helpful option for this type of injury, which has sidelined the former British number one for over a year.