Siya Kolisi suffered a partial anterior cruciate ligament (ACL) tear during a game between the Sharks and Munster in April this year, and it was feared he would not return in time for the Rugby World Cup. But as you know, return he did and in triumphant fashion at that, Lester Kiewit speaks to Dr Willem van der Merwe, the specialist knee surgeon and former cricketer who operated on Kolisi’s injury.