Actor Madhavan underwent a knee surgery in Australia last year after hurting his knee while shooting for '3 Idiots'. Recently, the actor hurt his knee again during the shoot of 'Vettai' and currently attending physiotherapy sessions. It seems Madhavan is distressed about the injury and upset over neglecting his doctor's advice of rest. It seems the actor has realized his mistake and shared his anguish via his twitter account. In his words, “Wish I had listened to my docs and taken a break earlier for my physiotherapy. Things would have healed so much faster. Big mistake”.