World Cup season has a way of bringing football back into sharper focus. For some, it means watching the game more closely. For others, it means playing more often, pushing harder, and returning to the pitch with the same enthusiasm that makes the sport so compelling. In my practice, this is also when I see a familiar pattern. Knee pain is tolerated for a little longer, swelling is explained away as part of the game, and players often continue because they can still walk, jog, or finish the match.
The problem is that cartilage injuries don’t always declare themselves clearly at the start. Unlike an unstable ligament injury, the knee might not give way immediately. Unlike a locked meniscus tear, movement might not be obviously blocked. Yet the cartilage surface can still be affected in a way that changes how the knee responds to load, especially with sprinting, stopping, pivoting, tackling, landing, and repeated changes of direction. This is why I don’t treat cartilage damage as a simple scan finding or a standard pathway. As I have discussed in my article on a bespoke approach to cartilage repair, treatment has to be matched to the symptoms, the defect, the rest of the knee, and what the patient needs that knee to return to. The same principle is reflected in the ICRS-FIFA-Aspetar consensus on knee cartilage injuries in footballers, where the decision isn’t automatic surgery, but careful assessment of when surgery is appropriate and when other forms of care should be considered.
Why Cartilage Injuries in Football Can Be Difficult to Judge
A cartilage injury isn’t always judged by how much pain the player feels on the day. In football, I’m more interested in how the knee behaves after activity. A player might be able to walk normally, jog in a straight line, or manage daily activities, yet still develop swelling after a match, a deep ache inside the knee, or discomfort when changing direction. The difference is important because the knee can appear functional in ordinary movement while still struggling with the demands of the sport.
There’s a biological reason for this. Cartilage has no nerve supply, so symptoms don’t always come directly from the damaged surface itself. Instead, pain and swelling often reflect how the surrounding joint, joint lining, and underlying bone respond when demand increases. In other words, pain alone doesn’t always show how clinically significant the injury is, or how much it affects the knee once the player returns to football.
This is where the difference between walking and football becomes clinically important. Walking might show that the joint can cope with everyday activities, but football repeatedly challenges it through acceleration, braking, pivoting, tackling, landing, fatigue, and rapid changes of direction. As those demands build, a knee that feels comfortable during daily movement might become swollen, painful, or unable to tolerate the same intensity on the pitch. This distinction between everyday function and football readiness is often one of the first clinical clues before I interpret a patient’s MRI in its proper context.
Why the MRI Is Only One Part of the Picture
When I review an MRI for a footballer with a suspected cartilage injury, I don’t treat the image as the decision by itself. The scan can show the location and size of the cartilage defect, the condition of the surrounding cartilage, whether the underlying bone is involved, and whether there are associated meniscus or ligament injuries. However, these findings only become meaningful when they are matched to the patient’s symptoms, examination, swelling pattern, activity demands, and expectations.
The history of the injury also matters. A cartilage defect after a tackle, twist, or awkward landing isn’t the same as a longer standing problem that has gradually become more symptomatic through repeated football. In the same way, a small contained lesion in a stable, well aligned knee is very different from a defect with bone involvement, meniscus deficiency, ligament instability, or abnormal loading across the joint. This is why I assess the knee as a whole rather than treating the MRI finding in isolation.
Once the whole knee is considered, cartilage specific experience becomes important. It isn’t enough to recognise a defect and attach a procedure name to it. The judgement lies in knowing whether the lesion is suitable for repair, whether the joint environment can support recovery, and whether surgery is truly the right step compared with rehabilitation, injections, or continued monitoring. The MRI tells us what needs attention, but the treatment decision comes from matching the scan to the patient, the knee, and the goal of returning to football without compromising longer term joint health. I have treated many professional footballers with only arthroscopic knee debridement to remove unstable cartilage, or with intra-articular injections so they can return to the season faster. Not everything is cartilage repair, and it’s unwise to think so.
What the ICRS-FIFA-Aspetar Consensus Adds
This is why the ICRS-FIFA-Aspetar consensus is useful. In Part 1 of the consensus, 17 voting experts assessed 96 clinical scenarios for symptomatic knee cartilage lesions in competitive footballers, looking at factors such as injury onset, lesion location, defect size, bone involvement, symptom level, and whether the player prioritised a quick return to play or longer-term results. Surgery was considered appropriate in only about one third of those scenarios, which reinforces an important principle in cartilage care: a visible defect doesn’t automatically mean surgery is the next step.
This finding shouldn’t be misread as saying surgery is rarely needed. Rather, it shows that the decision depends on how several factors interact. A player who can’t play, has a larger lesion, has bone involvement, or is prioritising longer term joint health is considered very differently from someone with a smaller defect, manageable symptoms, or a knee that still responds well to non-surgical care. For me, the consensus supports the same clinical approach I use in practice: the decision has to come from the patient’s symptoms, the lesion, the wider knee environment, and the goal we’re trying to protect.
Surgery or Non-Surgical Care: Why is It Case-by-Case?
The practical question isn’t whether surgery sounds more decisive, or whether non-surgical care sounds safer. The question is which option gives that particular knee the best chance of recovering function without creating unnecessary surgical risk. For some patients, structured non-surgical care is the right path. This might include rehabilitation, strength work, load modification, movement retraining, and selected injections, especially when symptoms are manageable, the knee remains stable, and function can improve without directly treating the cartilage defect.
For others, the balance can shift towards surgery. If swelling keeps returning, pain remains deep in the joint, function is limited, or the player can’t progress back towards football despite appropriate care, cartilage repair or regeneration might become more relevant. Even then, the decision isn’t based on the cartilage defect alone. The lesion has to be assessed together with the surrounding cartilage, underlying bone, meniscus, ligaments, alignment, loading pattern, and the patient’s ability to commit to rehabilitation.
By that point, the decision becomes a matching process rather than a simple choice between surgery and no surgery. My role is to assess the defect, the biology, the mechanics of the knee, and the treatment options. The patient’s role is just as important because their goals, rehabilitation commitment, tolerance for risk, and expectations for return to football all shape the decision. The right answer isn’t the least aggressive option or the most advanced procedure. It’s the option that best fits the knee, the person, and the long-term goal we are trying to protect.
Why Cartilage Treatment Decisions Shouldn't Be Rushed
Because the decision depends on the lesion, the wider knee environment, and the patient’s goals, I try to slow the process down by the time cartilage treatment is being considered. The question isn’t simply whether something can be done, but whether it’s the right thing to do for that knee, at that point in time. In cartilage care, a procedure can be technically possible and still not serve the patient well if the lesion, joint environment, rehabilitation demands, or longer-term goal haven’t been properly understood.
This is where experience matters. Much of the judgement lies in knowing when repair or regeneration is suitable, when the knee needs a different strategy, and when surgery shouldn’t be rushed simply because a procedure is available. I always tell my patients: cartilage repair is bespoke (each cartilage defect is different), a team sport (with the physios and allied health professionals), and a long game of full day with extra time and ending with penalty shootouts, as the cartilage takes time to heal, and we must respect that timeline.
The discussion also needs to be separated into layers. The first is the threshold question: whether surgery should be considered at all. The second is the treatment question: if surgery is appropriate, which cartilage procedure best fits that knee. The ICRS-FIFA-Aspetar consensus makes that same distinction across its two parts, and it gives a useful way to think about cartilage care in practice. This article has focused on the first question. In the next part, I’ll discuss how the repair or regeneration strategy is chosen, and why that choice depends on defect characteristics, stability, alignment, loading environment, and the patient’s goals.
