- [Home](https://ortopediaevolutiva.com/en) - [Conditions](https://ortopediaevolutiva.com/en/conditions) - Osteochondritis Dissecans of the Knee in Children and Adolescents Trauma & Sports # Osteochondritis Dissecans of the Knee in Children and Adolescents Recurrent knee pain in a young athlete, swelling, catching or locking sensations? Osteochondritis dissecans (OCD) of the knee is an osteochondral lesion that needs dedicated assessment: skeletal age, site and fragment stability guide the pathway. Updated: July 2026 · Medically reviewed by [Dr. Daniele Priano](https://ortopediaevolutiva.com/en/about) ## In short Osteochondritis dissecans (OCD) of the knee is a cartilage and subchondral bone lesion that can appear in growing athletes. The picture is often subtle — recurrent pain, swelling after activity, sometimes catching or locking — and must be distinguished from overuse apophysitis (Osgood-Schlatter, Sinding-Larsen). Skeletal age, site and fragment stability guide the choice between conservative and surgical pathway. ## When an evaluation can be useful - · Knee pain that persists or recurs in a growing athlete - · Joint swelling after sports activity - · Catching, locking or giving-way sensation in the knee - · Diagnostic doubt with Osgood-Schlatter or Sinding-Larsen-Johansson - · Need for a follow-up MRI or a second opinion The aim of the visit is to distinguish OCD from overuse apophysitis and to define, with targeted imaging, a pathway proportionate to the lesion. The aim of the visit is not always to start a treatment: often it is to understand whether the situation can be observed calmly or whether further investigation is needed. [Assess the young athlete's knee](https://ortopediaevolutiva.com/en/locations)[See how the paediatric orthopaedic visit works](https://ortopediaevolutiva.com/en/visit-guide/journey) [Dr Daniele Priano and his approach](https://ortopediaevolutiva.com/en) · Visits in Milan at Pini and CTO, subject to availability. ## When not to wait - · Sudden and persistent joint locking - · Marked swelling after trauma - · Inability to bear weight on the limb Joint locking that does not resolve, swelling appearing right after trauma, or inability to bear weight need prompt assessment (emergency service or doctor). In other cases an orthopaedic evaluation is advisable without waiting. This information does not replace a medical visit and does not allow a diagnosis at a distance. **Osteochondritis dissecans (OCD) of the knee** is a condition in which an area of subchondral bone is affected, with possible involvement of the overlying cartilage and loss of fragment stability. In children and adolescent athletes it is the most frequent site of OCD, typically involving the **medial femoral condyle** (lateral aspect of its surface), less often the lateral condyle or the patella. The clinical picture is often subtle and insidious. Initially there is **vague pain, typically during or after sports activity**, often with **intermittent swelling** after significant loads and a sense of stiffness or fatigue of the knee. In more advanced pictures, when the osteochondral fragment becomes unstable or detaches, **mechanical symptoms** appear: catching, locking, sudden giving way. The most important clinical distinction is between the **juvenile form** (with distal femoral growth plate still open) and the **young adult form** (with closed physes). The juvenile form has a much better potential for spontaneous healing, and **stable** lesions are often managed non-operatively; unstable or detached fragments require specific surgical assessment. In the young adult form the prognosis with conservative treatment alone is less favourable and surgery is more frequently required. ### OCD of the knee vs overuse apophysitis A recurrent point in the clinic is the confusion between OCD and juvenile apophysitis. They are very different conditions: - OCD involves the articular surface (cartilage + subchondral bone) inside the joint. It can progress to real articular damage if not recognised. - [Osgood-Schlatter](https://ortopediaevolutiva.com/en/conditions/juvenile-osteochondrosis), [Sinding-Larsen-Johansson](https://ortopediaevolutiva.com/en/conditions/juvenile-osteochondrosis) and [Sever's heel apophysitis](https://ortopediaevolutiva.com/en/conditions/heel-pain-apophysitis) are overuse apophysitis : they involve developing tendon attachment sites (tibial tuberosity, lower patellar pole, calcaneum). Symptoms often improve but may persist; they are not articular surface lesions like OCD. **Anterior knee pain** due to apophysitis is precisely localised at the tendon insertion and typically evoked by palpation. OCD pain is deeper, often poorly localised by the child, and more frequently associated with joint effusion and mechanical symptoms. For an overview of anterior knee pain see [anterior knee pain in children and adolescents](https://ortopediaevolutiva.com/en/conditions/anterior-knee-pain). ### How the diagnosis is made Diagnosis is based on three steps: **accurate sports history**, **clinical examination** (Wilson test, search for effusion, assessment of knee mobility and stability) and **targeted imaging**. **Targeted radiographs** (anteroposterior, lateral and "notch view"/intercondylar) are the first-line investigation. **MRI** is used when needed to characterise the lesion further — site, size, state of the overlying cartilage and, most importantly, **fragment stability** — and is particularly useful to plan treatment or to monitor a lesion over time. The therapeutic pathway is never automatic: it depends on skeletal age, site and size of the lesion, fragment stability and symptoms. For a broader overview of paediatric knee trauma see [knee trauma in children and adolescents](https://ortopediaevolutiva.com/en/conditions/knee-injury-children-adolescents) and [paediatric sports injuries](https://ortopediaevolutiva.com/en/conditions/sports-injuries). ## Assessment and treatment ### When to seek evaluation - Knee pain that persists or recurs in a growing athlete - Joint swelling after sports activity - Sense of stiffness, catching or giving way of the knee - Joint locking — even transient - Pain that does not improve after some weeks of load management - Diagnostic doubt with respect to apophysitis (Osgood-Schlatter, Sinding-Larsen) ### What is evaluated - Sports history (discipline, loads, calendar, previous episodes) - Clinical knee examination with specific tests (Wilson, painful palpation, effusion) - Assessment of skeletal age (open vs closed physes) - Standard X-ray with intercondylar (notch) view - MRI to define site, size and stability of the lesion - Differential diagnosis with apophysitis, meniscal lesions, patellar instability ### Treatment options - Sports load modification and reduction of high-impact activities (stable form with open physes) - Targeted rehabilitation programme: muscle strengthening, proprioception, neuromuscular control - Brace or temporary unloading in symptomatic phases or selected cases - Surgical treatment in unstable lesions, detached fragments, or forms not responding to adequate 3-6 month conservative treatment - Clinical and, when indicated, imaging follow-up to monitor progress ## Frequently Asked Questions What is the difference between OCD of the knee and Osgood-Schlatter disease? ▼ They are very different conditions. Osgood-Schlatter is an overuse apophysitis involving the growth cartilage of the tibial tuberosity (where the patellar tendon inserts): it causes very localised pain just below the patella, often improves with growth but may leave symptoms, and is not an articular lesion like OCD. OCD instead involves the articular surface inside the knee, typically the medial femoral condyle: pain is deeper, less localisable, and may be associated with swelling, catching or locking. The distinction is made by examination and, when needed, X-ray and MRI. Does OCD of the knee heal on its own? ▼ In the juvenile form — with distal femoral growth plate still open — many stable lesions heal with a structured conservative pathway of several months (load modification, physiotherapy, follow-ups). In unstable lesions, detached fragments or young-adult forms, spontaneous healing is much less likely and surgery is more often required. Symptoms, clinical findings and follow-up imaging when indicated are considered together to assess healing. Does my child need to stop sport? ▼ Not necessarily completely. In stable forms the pathway is typically load modification: high-impact activities (prolonged running, jumping, cutting, contact sport) are reduced or paused for a period, while low-impact activities compatible with the clinical picture can be maintained. Return is gradual and guided by clinical progress and follow-up imaging, not by a fixed calendar. Complete and permanent cessation of sport is rarely necessary. Is MRI always needed? ▼ Not always. Targeted radiographs are the first-line investigation. MRI is used when it is needed to better characterise the lesion — stability, cartilage status, size — or to help plan treatment and monitor its evolution; it is not a routine step for every child with suspected OCD. When is surgery indicated? ▼ Surgery is considered in unstable lesions, in already detached fragments (loose bodies with mechanical symptoms), in young adult forms with closed physes and unfavourable conservative prognosis, and in forms not responding to an adequate 3-6 month conservative pathway. The technique depends on lesion characteristics: drilling of the lesion, fragment fixation with bioabsorbable screws, or cartilage repair techniques in more complex cases. What are the recovery times? ▼ Highly variable and dependent on the lesion and on how it responds to treatment. In the conservative pathway, orientative timeframes of several months are often mentioned, but they are only a general reference. After surgery, timing depends on the technique used. Return to sport is always gradual, guided by symptoms, clinical examination, skeletal maturity, joint stability and, when indicated, imaging — not by a fixed calendar. When should we go to the emergency department? ▼ If a parent or child recognises a true joint locking episode — the knee suddenly blocks and cannot be fully moved — this deserves urgent assessment to rule out an unstable lesion or loose fragment, rather than a description of "a loose piece inside the knee". Marked swelling after a trauma or acute functional impairment should also be seen promptly. For chronic or recurrent sports-related pain without locking, a scheduled paediatric orthopaedic evaluation is more appropriate and allows a structured work-up. **Important Notice:** The information on this page is for educational and informational purposes only and does not constitute medical advice. Each clinical case is unique: the appropriate treatment is determined during the specialist consultation, based on a thorough clinical examination and, where necessary, diagnostic imaging. For any doubts or concerns, please consult a specialist. ## Scientific references - [Nammour MA et al. Osteochondritis dissecans lesions of the knee: evidence-based treatment. J Am Acad Orthop Surg 2024;32(13):587-596. PMID 38295387.](https://doi.org/10.5435/JAAOS-D-23-00494) - [Coladonato C et al. Return to sport after surgical treatment of unstable osteochondritis dissecans: a systematic review. Orthop J Sports Med 2024;12(8). PMID 39131095.](https://doi.org/10.1177/23259671241258489) ## Complete knee and sport pathway This page is part of the knee and sport pathway. The sports injuries page covers the overall picture. - [1 Overview: sports injuries in the growing athlete How the knee and the growing musculoskeletal system respond to sport.](https://ortopediaevolutiva.com/en/conditions/sports-injuries) - [5 Osteochondral lesions · you are here Osteochondritis dissecans: when cartilage and subchondral bone are involved.](https://ortopediaevolutiva.com/en/conditions/osteochondritis-dissecans-knee) - [6 Exercises: what they help with and their limits Sheets for anterior pain, apophysitis, patellar instability and limb alignment.](https://ortopediaevolutiva.com/en/parents-kids/exercises/knee) - [7 Recovery after surgery and return to sport Professional protocols for ligaments, menisci, patella and osteochondral lesions.](https://ortopediaevolutiva.com/en/rehabilitation) Adjacent clinical pictures: [Knock knees and bow legs](https://ortopediaevolutiva.com/en/conditions/knock-knees-bow-legs) · [Surgical axis correction](https://ortopediaevolutiva.com/en/surgery/knock-knees-bow-legs) ## Learn more [All conditions](https://ortopediaevolutiva.com/en/conditions)[Medical glossary](https://ortopediaevolutiva.com/en/glossary) --- Canonical: https://ortopediaevolutiva.com/en/conditions/osteochondritis-dissecans-knee Le informazioni cliniche sono divulgative e non sostituiscono una valutazione medica diretta.