The personalised number plate, R999 ACL, proclaims Steve Bollen's crusade against the knee injury that haunts the sporting world. Bollen specialises in rebuilding ruptured anterior cruciate ligaments, a calling that has, in the last year or so, brought him into close contact with around £15m-worth of knees.
They belong to men like Scotland captain Gary McAllister, Lee Sharpe of Leeds United, Niall Quinn of Sunderland, Dean Richards of Wolves and Huddersfield Town's Tom Cowan, who has just completed a book about his season in the shadow of this career-threatening injury.
Forty-three-year-old Bollen, who is the surgeon to six football and rugby league clubs as well as the Northern Ballet Company, repairs around 150 anterior cruciate ligaments a year with some 20 per cent of them involving professional sportsmen.
He is acutely aware of what is at stake when he restructures the knee of a high-profile footballer. "Particularly when his physio is standing behind me during the operation, reminding me that the player in question is worth around £5m," smiles Bollen, consultant orthopedic surgeon for the Bradford NHS Trust.
"But of course there is no preferential treatment. Every patient is the same. In fact, I recently performed the operation on a scaffolder - and I don't have to remind you that if his knee gave way again, there could be far more devastating consequences than anything involving a game of football.
"The bottom line is that this injury can strike anyone down and there are Sunday morning park players out there who don't even know it's happened because a proper diagnosis has not been made.
"Only 9.8 per cent are correctly diagnosed in the first instance and the average delay from injury to diagnosis is 22 months. That is a very worrying statistic. But at least the publicity given to big name professionals with an ACL rupture has made people more aware of its existence."
When the time comes for one of those big names to take his first tentative steps along the comeback trail, the surgeon makes a point of being there. Hence his presence at a sparsely-populated Elland Road when Sharpe returned to action last month.
It's the least I can do," says Bollen. "I try to stay in the back-ground, though. I don't like them to know I'm around.
"But the whole rehabilitation process is a three-way team effort between the player, his physio and me. I feel I would be missing out if I wasn't there when he actually played a competitive game again."
Thanks to Bollen and the coterie of surgeons who specialise in anterior cruciate repairs, the injury is no longer the ultimate nightmare for the professionals. But it is still potentially career threatening.
The ligament controls the rotation of the knee and is vital in any sport involving twisting and turning. The surgery replaces the ruptured ligament with either a stretch of the patella tendon, which links the kneecap and the shin bone, or a hamstring. The margin of error in ensuring that the new ligament is in the right place is two millimetres; the recovery period and its months of nagging doubt can seem like a lifetime to a man whose livelihood is on the line.
Bollen appreciates this. "The success rate of the operation nowadays is excellent but inevitably for the professional athlete there is the very real fear that he may never play again - and the recovery period is long. "I try to see the patient for the first time ten days or so after the operation and then at regular intervals afterwards. Their response to the injury varies; some manage to stay remarkably upbeat while others struggle to come to terms with it. "
Reassurance comes in the shape of men like England captain Alan Shearer, who recovered from the injury to become the world's most expensive player in a £15m move from Blackburn to Newcastle. He is not one of Bollen's former patients at the Yorkshire Clinic, Bingley.
"I don't pretend for a minute that I'm the only man around who can do this operation," says Bollen. "But there aren't many of us, which is why it's so important that anyone who sustains this injury sees the right person - and quickly.
"Of course, there is a bit of healthy rivalry between us, an element of one-upmanship. But no more than that. In the States, it sometimes seems as if they are in some kind of race to set a new record for a comeback - but I could never do that.
"Nature has to be allowed to take its course. Paul Gascoigne was probably right when he said that you don't need fancy training equipment to recover from this injury. Basically it's down to good old fashioned guts."