Watch this video of Mr Mihai Vioreanu, Consultant Orthopaedic Surgeon specialising in knee surgery, UPMC Sports Surgery Clinic talking about ACL Injury in Adolescents & Current Concepts
This video was recorded as part of UPMC Sports Surgery Clinic’s Online Public Information Meeting, focusing on Anterior Cruciate Ligament (ACL) Injuries in adolescent sports.
Mr. Mihai Vioreanu is a Consultant Orthopaedic Surgeon specialising in Knee Surgery and Hip Surgery at UPMC Sports Surgery Clinic in Santry, Dublin.
This is a topic that poses a lot of challenges to the patients themselves, to the families but also to the clinicians who look after these young athletes who would like to return to sport.
So, I hope that by the end of this lecture you will be able to suspect if not diagnose an ACL rupture in someone. I hope you’ll have a better understanding about the increased frequency of this injury and what is causing this increased epidemic and injuries. I also hope that you will be able to understand the treatment and the progress in the treatment that has been done in the last few years and what are the challenges with the reoccurrence of reinjury. Most importantly, I think that it is important to know how to prevent those injuries and the psychological aspects that impact those athletes beside the somatic ones which we are able to treat.
I’d like to present you a case, a patient of mine from 2021, this is Sarah who’s a 15-year-old transition year student who presented with an ACL rupture after playing a GAA match. She had surgery with me, we performed a primary ACL reconstruction with an lateral extra-articular tenodesis. She had a whole year of rehabilitation and after returning to playing GAA in the she suffered an injury to the other knee. When she returned to us we operated on the other knee and this time it was a huge disappointment for Sarah. I had to ask for psychologist, Dr Jessie to work with her in the second year of rehabilitation consecutively.
I had seen Sarah’s parents recently because they came in with her younger brother who also ruptured his ACL while playing GAA. So, this is a video of the injury that Sarah suffered, you can see her left knee that is forcefully stepping trying to change direction and decelerate and the left knee gave way. It’s almost classical that the patients hog their knees and they go to the ground, it’s sharp pain immediately they are often helped off the pitch but after a few minutes, although, the knee gets quite swollen it’s not that painful. This is a classical ACL injury, Sarah had surgery with us unfortunately after returning after a year she suffered another ACL injury.
So, how do we rupture the ACL? well generally the vast majority of injuries happen with a non-contact injury and as we saw in that video clip Sarah’s foot is stuck to the ground, there is an element of rotation to the knee and the lateral side literally comes out of the joint for a fraction of a second and pops back in. When that happens the ACL, which is a small ligament inside the knee, gets snapped. A small minority of injuries happen through contact when another player falls onto the patient’s leg or indeed from a hit from the side contact, as we can see in this picture. Those injuries are generally more severe and are associated with other ligament injuries.
This is a very interesting statistic that comes from our neighbours in UK and the study concluded that for every ACL reconstruction surgery from the 1990s we are doing 29 ACL surgeries now, there is a huge 300% increase in ACL injuries that we can see, possibly because is way more awareness among the general population also because at that time we didn’t recognise those injuries and therefore we didn’t treat them. I think everybody in the audience know a guy of my age who had a dodgy knee and was strapping the knee while playing football, these guys generally tend to get arthritis in their 50s and 60s requiring other forms of knee surgery.
So, just to expand on worldwide view in US due to their large number of sports people there are about 100,000 to 200,000 ACL’s per year. There is an increase in adolescence and juvenile ACL about 2.5% each year and females are four to six times higher in cutting pivoting sports in terms of ACL injuries. Australia has the highest rate of ACL reconstruction in the world, when a study looked at under 25-year old’s ACL rupture increased by 74% over the last 15 years. In Norway they have a very strong ACL registry in Northern European countries and a similar increase by 40 and 55%, respectively, in males and females in terms of ACL in adolescents and juveniles.
When we look at our own registry here at the Sport Surgery Clinic which we started in 2015 I just took the last five years and you could see at the bottom the grand total of ACL injuries in the under 20s has increased dramatically, in fact in the last three years we almost doubled the number of ACL injuries in young people.
Why is this epidemic? As I said, it’s a pure numbers game, increased participation in younger ages who play for longer periods of time, they play a number of sports and they play throughout the year, winter and summer. As they get better they tend to specialise in one sport and that actually is shown to be a risk factor in itself. We also have increased awareness regarding the injury, so it’s like everything else when you have such injury it seems like a new world opens up there with everybody around you having had the injury or knowing someone who had the injury themselves. Also, another factor is that we have more MRI availability and that increases an early diagnosis. In the past as, I said possibly people weren’t diagnosed or just diagnosed with an MCL injury and therefore weren’t treated accordingly.
There are some risk factors which are better recognised in more recent times. When I was training about 15 years ago in Australia family history was suspected but since then there have been various genes discovered as family history is a very significant risk factor for an ACL injury and when I say family history is brothers’ sisters’ parents. That also leads to type of collagen and that leads to hypermobility so often those patients are double jointed. If you ask around they often have injured their shoulders before due to type of collagen and also hyper mobility.
As I mentioned before, the girls are more susceptible to the injury than the boys and that is for a number of reasons. Firstly, girls will have a wider pelvis to accommodate childbirth and therefore they have knock knees more often than boys. When you have a knock knee it is more likely that you twist, particularly if the hip muscles are not strong enough and the core muscles are not strong enough and induce that rotation movement to the knee that snaps the ACL. There is also some hormonal variation that is suspected for an increased risk of ACL injury, an increase of oestrogen in girls sometimes and the variation through the menstrual cycle has been observed. Other factors would be the anatomy of the knee, some people have a narrow notch which is the place where the ACL lives and when you have a narrow notch it is more likely that you rupture your ACL.
Some people have increased slope and these are all anatomical factors that really, we cannot control but it’s important to be aware of them as treating clinicians. Of course, there are other factors, extrinsic factors, which we can control and that is the type of sport. So, we consider the riskier sport level one sport in terms of twisting, pivoting and cutting sports such as Gaelic football, hurling, soccer, rugby and basketball or net ball in other countries. Playing surface plays a role for ACL rupture so it’s been suspected, although it’s difficult to prove, that the AstroTurf due to increasing friction between the foot and the playing surface that rotational force is being transferred to the knee where it ruptures the ACL. The footwear, through the same mechanism, if you don’t have correct footwear for AstroTurf and if you increase that friction even more one can induce more rotation to the knee.
It’s been a myth that kids don’t need to warm up, they definitely do and I will show you some warm-ups that really are designed to prevent rupturing the ACL. Another myth that I want to dispel today and that is kids don’t need to go to the gym, they certainly do. Going to the gym is part of athletic skill development and athletic education. In fact, the American academy of paediatrics has recommended that resistant training in children and adolescence even prepubescent is really useful for their development. I don’t mean going to the gym and doing CrossFit or lifting up weights but weight resistance, could be your own body weight it could be elastic bands it could be chin-ups, pull-ups, agility proprioceptive exercises that should be done in the gym under supervision and learning how to do correct jumps hops and step-ups.
Now when it happens how do we fix it? We generally take a graft from a different part of the knee and some techniques take a graft of the patella, where you take a piece of bone of the patella and a piece of bone of the tibia with a tendon in between and the patella tendon is being rooted into the knee to become your ACL and being fixed with two screws. Another technique will be to take the hamstring tendons from the back of the leg and similarly that’s being rooted in the knee to become the new ACL and to control rotation. So various surgeons have various preferences but in this age group when the physis and the growth plates in the kids are closing or still open in particularly the prepubescent one’s hamstring is preferred due to the fact that putting a bone block through the physis is not really indicated.
So, what is the challenge with these injuries obviously the same as primary ACL’s happen more often also the re-rupture rate is quite high so when you think about it why did it happen in the first place? Obviously, what we reconstruct it’s not as strong, as solid as what we were born with and therefore we encounter a re-rupture, rate a reinjury rate and that has been reported around the world irrespective of who does it, where it’s being done or what graph they use between as little as 8% at two years and as high as 30% at three years so it’s been widely accepted in the literature that in this age group one in four athletes younger than 25 who return to sport after ACL surgery will go on to have a secondary ACL injury and what I mean by secondary ACL injury is either rupture of the graft or injuring to the other knee. If you think about it again why did it happen in the first place, if you go back to the same risk factor particularly level one sport there is a huge chance that that will happen again particularly to the other knee. That led to around the world for people to try to reduce this reinjury rate and re-rupture rate and on this background the extra articular procedure has been explored as another surgical innovation in order to reduce the re-rupture rate, so what does it mean as shown in the picture beside doing the ACL graft we also take a strip of the iliotibial band which is a strong fibrous layer at the side of the knee on the outside and wrap it around one of the ligaments to stop it rotating, I describe it as being like a seat belt and that took vogue about 10 years ago and the research that has been conducted since shows that the re-rupture rate has been reduced to less than 4%.
I would like to share with you our experience here in our practice in UPMC Sport Surgery Clinic when we used the extra articular procedure, I looked at all my patients over a period of six years, we had about 192 patients we lost a few to follow up, but about 160 were followed up for a minimum of two years all these patients were operated with hamstring graft and lateral extra-articular tenodesis and they were followed up for a minimum of two years. So, this graph shows the distribution of females and males, there were more males in the younger adult group and there were a few prepubescent about 10 patients before their puberty and they require a special surgical technique.
I grouped the sports that they were doing, the vast majority being GAA both hurling and Gaelic football at about 75% of patients were in GAA. A few patients played soccer and a few played rugby while the rest played basketball or gymnastics. So, what did we find after following these people from between two and eight years [post-surgery]? We found everybody and we asked them if they had any other surgery, we found out that the re-rupture rate, in other words injury to the same knee, only four patients suffered this and they were representing about 2.5% significantly lower to the rates worldwide. A significant number about 20 patients suffered an injury, like Sarah, to the other knee representing about 12.6%.
What have we learned by looking at our work and data in the last eight years? So, we demonstrated that the hamstring graft and with the lateral extra-articular tenodesis. significantly reduces the rupture rate to 2.5%. There is still a high rate of contra-lateral injuries, about 13%. I insist that the patients will have a minimum nine months of rehabilitation and may return to sport one year after their surgery. We do that after we test them clinically in our 3D biomechanical lab. I stress to everybody at nine months when I see them the importance of injury prevention and we look at psychological readiness after such traumatic event and after such a long period of rehabilitation if they’re ready to return to sport.
If you remember nothing from my talk maybe you will remember this GAA 15 warm-up which is excellent work done by our GAA community of physio and coaches essentially what this is an activate program it’s a warm-up that is about 15-20 minutes and includes a series of shutter runs strengthening agility and proprioceptive exercises. There are similar programs around the world such as the FIFA 11 plus or PEP program in the states and there’s been a lot of research done in collegiate athletes showing that if we do these warm-ups at least three times per week we reduce the risk of knee injuries by 40 to 60%. This is really important, if we invest time in becoming agile strong reactive as players and our kids follow this warm-up, it is like brushing your teeth, you half the reinjury rate.
In terms of performance psychology, I was fortunate to meet Jessie about two years ago in Aspire Orthopaedics our office along with Professor Brian Devitt and Mr Gavin McHugh, we work in close relationship with Jessie and she sees all our patients that require psychology intervention. Jessie is a former athlete and understands very well the trauma that those kids go through and helps them psychologically to get over the injury, plan their rehabilitation, plan their return to sport and also to deal with a possible reinjury as well.
That’s a really insightful question, normally we operate on what we call a cool knee so a knee that is pain free and has full range of motion. There is a very short window that you could operate it straight away but generally, when patients get the injury by the time they get the MRI and get referred to us they will be passing that window which is the first few days, so it’s almost never that urgent. The ideal time to operate is when the patients swelling has gone down and they are moving the knee freely, that takes about between four and six weeks. If the patient is stiff and swollen before surgery it will be very stiff and very swollen after the surgery so there is that concept of pre-habilitation when we ask the patient to get on the bike, get all the braces off. This is another misconception that kids and general patients get put in braces by various health care professionals, so the idea is if it happened once it will not happen again until they play sports. It’s good for the patient to get on the bike, ice the knee, fully weight bear, walk properly on it and then once we see them we continue this pre-habilitation program until we get to surgery generally between four and 6 weeks.
That is a relatively new indication as I presented in the talk, it’s been sort of promoted and researched in the last 10 years I’ve been doing it for the last eight years. I started with doing only the revision ACLs, they’re done second time. I’m trying to select the high-risk patients and what I mean by that is patients and teenagers who have either a family history, are, double-jointed, have increased laxity and also want to return to level one sport and I mean by that GAA, hurling, rugby, soccer. They have a higher risk as shown in the talk of reinjury and those patients I do extra articular procedure like a seat belt to protect the ACL graft.
It’s not really a treatment, we don’t use it, stem cells really are bleeding and when we do the surgery we create a lot of bleeding from the bone. Stem cells is a word that’s being maybe used in marketing and promotion of various clinics. There is no evidence that the stem cells are helping in degenerative conditions but not at all in youngsters who have a lot of proliferative cells, we don’t use that at all.
That’s a very rare situation, there is no such thing as an overstretch ACL, I think it’s a partial torn ACL. If you remember the mechanism of injury that half of the knee dislocates and it’s like tearing a rope, you put tension on it and it gets stretched to a certain point and it fails catastrophically and that’s why the ACL ruptures, it’s a catastrophic failure of the ACL. It is not like an elastic that gets stretched, it’s extremely rare. Maybe in a low energy situation like skiing or jiujitsu that you slowly stretch the knee, I’ve seen it maybe once or twice. Generally, we treat those conservatively but if the patient has instability with such stretch we tend to reconstruct it but that’s a very rare situation.
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