A child complains of knee pain. Somebody says growing pains. Everybody moves on.
Sometimes that is right. A great deal of knee pain in children and adolescents is related to growth and activity, is self limiting, and settles with sensible management.
And occasionally it is not, including one scenario where knee pain is not coming from the knee at all and needs urgent attention.
Here is how to tell the difference.
The Most Common Cause in Active Teenagers
Pain at the bony bump just below the kneecap, which may become prominent and tender, is the classic presentation of Osgood-Schlatter.
What it is: irritation where the tendon from the kneecap attaches to a growth area on the shin bone. During growth spurts, bone lengthens faster than the muscle and tendon adapt, which increases the pull on that attachment point at exactly the moment it is least able to tolerate it.
Who gets it: active adolescents during their growth spurt. It is more commonly reported in boys, typically around the ages of 13 to 15, with girls usually affected somewhat earlier.
The pattern: pain during and after activity, better with rest, worse with running, jumping and kneeling. Often one knee, sometimes both.
The prognosis is good. It is self limiting and resolves as the growth area matures and fuses. Surgery is not required.
But the timeline matters. Waiting it out can mean a couple of years of a child limping off pitches and gradually withdrawing from sport they enjoy, which is a considerably worse outcome than managing it actively.
What helps: activity modification rather than complete rest, meaning reducing the volume and intensity to a level the knee tolerates. Quadriceps and calf flexibility work, since tightness increases the pull. Strengthening. And attention to footwear and training load.
A note on the bump. The bony prominence frequently remains after the pain resolves. It is cosmetic rather than problematic.
The Variation at the Other End
Pain at the bottom tip of the kneecap itself, rather than below it on the shin, suggests the same process at a different site.
Same population, same mechanism, same general approach.
It is worth distinguishing because people assume all adolescent knee pain is Osgood-Schlatter, and the location tells you which site is involved.
Kneecap Pain in Adolescents
The presentation: aching at the front of the knee, worse going down stairs, worse after prolonged sitting with the knees bent, worse squatting.
Common in adolescents, and notably more common in girls.
What contributes: rapid growth changing the relationship between bone length and muscle control, hip and thigh strength not keeping pace, and increases in training load.
What helps: strengthening, with the evidence pointing to hip strength mattering at least as much as quadriceps work, plus load management.
Worth taking seriously rather than dismissing, because adolescent kneecap pain has a tendency to persist into adulthood if it is not addressed properly.
The One That Is Not the Knee
This section matters more than anything else on this page.
Hip problems in children and adolescents frequently present as knee pain.
Slipped upper femoral epiphysis is the one to know about. It occurs typically in adolescents, more often in those who are overweight, and it involves the growth plate at the top of the thigh bone.
And it commonly presents with pain felt in the knee or thigh rather than the hip.
Which means a child with knee pain, a limp, and restricted hip movement may have a hip problem that is being investigated as a knee problem.
Features that should prompt prompt medical assessment:
Knee or thigh pain with a limp.
Pain that is not clearly related to activity.
Restricted or painful hip movement, particularly turning the leg inwards.
An inability or reluctance to bear weight.
A leg that is turned outwards.
This needs urgent assessment, because outcomes are considerably better when it is identified early.
Other hip conditions in younger children, including Perthes disease, can present similarly.
The practical rule: in a child with knee pain, the hip should always be examined. If nobody has looked at the hip, that is a gap.
Red Flags in a Child With Knee Pain
Some presentations need prompt medical attention rather than reassurance.
Seek urgent medical assessment for:
A knee that is hot, red and swollen, particularly with fever. This needs same day attention, since joint infection in children is a medical emergency.
Inability or refusal to bear weight.
A limp, particularly a persistent one.
Night pain that wakes the child, especially if it is not relieved by simple measures.
Pain unrelated to activity.
Significant swelling.
Weight loss, fevers, night sweats, or a child who seems generally unwell.
Pain in multiple joints.
A knee that locks or gives way.
And any pain that is progressively worsening rather than fluctuating with activity.
Why these matter: while uncommon, serious causes including infection, inflammatory arthritis and bone tumours do occur in this age group, and night pain and systemic symptoms are the features most associated with them.
Growing pains, as a concept, should be a diagnosis of exclusion rather than an assumption. Genuine growing pains typically affect both legs, occur in the evening or at night, resolve by morning, and are not associated with limping or swelling.
What Parents Can Usefully Do
Take persistent knee pain in a child seriously. Two weeks of pain that is not settling warrants assessment.
Ask about the hip, specifically, if nobody has mentioned it.
Count the load. School sport, club sport, matches, training, and whatever they do for fun all add up, and no single coach sees the total. Somebody has to hold the whole number.
Watch for the quiet withdrawal. Children frequently stop reporting pain because they worry about losing their place in a team. A child who has gone off a sport they used to love may be managing something they have not mentioned.
And avoid the phrase growing pains as a conversation ender. It covers a lot of ground and it delays assessment.
What Coaches Can Usefully Do
Ask rather than wait to be told.
Make it clear that reporting will not cost them their place, since that belief is the main obstacle to early reporting.
And watch the calendar, particularly around growth spurts and around transitions between seasons, when load frequently increases sharply.
The Reassuring Summary
Most adolescent knee pain is activity and growth related, self limiting, and manageable without stopping sport entirely.
The exceptions are identifiable, and the features that distinguish them are listed above.
And early management generally means less time lost, which matters considerably to a child who wants to keep playing.
Let Us Assess It Properly
An assessment takes one appointment, usually produces a clear plan the same day, and importantly includes examining the hip as well as the knee.
Ravenscroft Health offers a free discovery visit at no cost and no obligation. Bring your child and their sports kit. You will get a thorough paediatric assessment, a clear explanation of what is going on, and a practical plan for keeping them in their sport while it settles.
If their presentation suggests something needing imaging, blood tests or onward referral, we will tell you plainly and we have those routes available.
