Question 1

What's the difference between osteochondral defects and regular cartilage damage?

Accepted Answer

The key difference is whether underlying BONE is damaged along with cartilage. PURE CHONDRAL (cartilage-only) INJURY: Damage limited to cartilage layer. Underlying bone is intact and healthy. MRI shows cartilage thinning or defect but bone appears normal (bright white signal). Pain ONLY with activities (cartilage has no nerves, pain from joint inflammation). Swelling is mild to moderate. OSTEOCHONDRAL INJURY: Damage involves BOTH cartilage AND underlying subchondral bone. MRI shows cartilage defect PLUS bone marrow edema (bone bruising - appears dark on T1, bright on T2/STIR). Pain is MORE SEVERE and includes deep aching pain at REST and AT NIGHT (bone marrow edema very painful - bone has nerve endings). Swelling is often larger (bone marrow elements very inflammatory). Healing is MORE COMPLICATED (need to heal both cartilage AND bone - bone component can heal but takes 6-12 months for edema to resolve). PROGNOSIS generally WORSE than pure cartilage damage. CAUSES: Osteochondral injuries typically from HIGHER-ENERGY trauma (patellar dislocation with bone impaction, dashboard injury, significant ACL injury with bone bruising, osteochondritis dissecans). Pure chondral injuries from lower-energy (twisting, chronic overuse, gradual degeneration). TREATMENT IMPLICATIONS: Osteochondral defects may need BONE GRAFTING in addition to cartilage repair (if bone defect is deep or has cyst formation). Fragment fixation is option for acute osteochondral fractures (save native bone and cartilage together). Microfracture relies on drilling into bone to stimulate healing (may be less effective if bone is already damaged). OATS procedure actually REQUIRES taking bone with cartilage (restores both layers together). BOTTOM LINE: Osteochondral defects are more serious than pure cartilage damage - involve bone component that causes more pain, takes longer to heal, and has worse prognosis. But bone CAN heal (unlike cartilage which cannot) if given adequate time and protection.

Question 2

My teenager has osteochondritis dissecans (OCD) in their knee - will it heal or do they need surgery?

Accepted Answer

OCD healing depends primarily on SKELETAL MATURITY (whether growth plates are still open) and LESION STABILITY. STABLE OCD IN CHILDREN/ADOLESCENTS WITH OPEN GROWTH PLATES: BEST PROGNOSIS. 50-60% heal with conservative treatment (activity restriction 3-6 months). TREATMENT: Stop sports and high-impact activities completely for 3-6 months. Swimming and cycling OK (maintain fitness without knee impact). Serial MRI every 3 months to monitor healing (bone marrow edema should gradually resolve, lesion should show healing). Physiotherapy to maintain range of motion and muscle strength. HEALING SIGNS: Decrease in bone marrow edema on MRI, Lesion fills in and incorporates, Pain resolves, No catching or mechanical symptoms. DURATION: 3-6 months for healing if lesion is going to heal. If NO improvement after 6 months conservative treatment → consider surgery. STABLE OCD IN ADULTS (CLOSED GROWTH PLATES): POOR HEALING (less than 20% heal conservatively). Skeletal maturity = loss of healing potential. Most require surgery eventually. Can trial conservative 3-6 months but low success. UNSTABLE OCD (ANY AGE): SURGERY REQUIRED. Unstable means: Fluid signal completely surrounding lesion on MRI (lesion lifting off bone), Mechanical symptoms (catching, locking, giving way), Lesion visible to be mobile on arthroscopy. Unstable lesions will NOT heal conservatively and will detach becoming loose bodies (cause progressive arthritis). SURGICAL OPTIONS: STABLE lesions failing conservative: Drilling (stimulate healing by creating channels for blood supply and bone marrow cells), Fixation with screws/pins if lesion large (compress lesion to underlying bone to promote healing). UNSTABLE or DETACHED lesions: Fix fragment if fresh and viable (screws, pins, bioabsorbable nails), OR remove fragment and repair defect (microfracture, OATS, or ACI depending on size). YOUR TEENAGER'S SPECIFIC SITUATION: If growth plates OPEN (check X-ray) and lesion STABLE (no fluid around lesion, no mechanical symptoms): HIGH chance of healing (50-60%) with strict activity restriction 3-6 months. Emphasize COMPLIANCE - no cheating with sports (fragment can detach if load too early). If growth plates CLOSED or lesion UNSTABLE: Surgery likely required. Better to operate before fragment detaches (fixing in place easier than repairing resulting defect). AGE MATTERS: OCD diagnosed at age 12-14 has MUCH better prognosis than age 17-18 (younger = more growth remaining = better healing). FOLLOW-UP: Serial MRI critical. If lesion not healing after 3-6 months conservative treatment, don't wait years hoping - intervene surgically before progression. PROGNOSIS: With appropriate treatment (conservative for stable + open growth plates, surgery for unstable or skeletal maturity), 70-85% good long-term outcomes. Untreated OCD progresses to detached fragment and early arthritis - MUST be treated.

Question 3

I dislocated my kneecap and now have an osteochondral fracture - do I need surgery urgently?

Accepted Answer

PATELLAR DISLOCATION causes osteochondral fracture in 30-50% of cases (very common). Urgency of surgery depends on FRAGMENT SIZE and LOCATION. LARGE FRAGMENTS (over 1cm diameter): SURGERY RECOMMENDED URGENTLY (ideally within 2-3 weeks of injury). WHY URGENT: Fragments remain viable only 2-3 weeks (cartilage cells die if fragment not revascularized quickly). Early fixation (within 2 weeks) has 70-85% success rate. Delayed fixation (over 3-4 weeks) drops to 40-60% success (fragment loses viability, may not heal even if fixed). GOAL: Save native cartilage and bone by fixing fragment back in place. Superior to removing fragment and doing cartilage repair (native tissue always better than repair tissue). SURGERY: Arthroscopic or mini-open. Fix fragment with bioabsorbable screws/pins or metal screws. RECOVERY: 4-6 weeks protected weight-bearing, 3-6 months return to activities. OUTCOMES: 70-85% good results if fixed within 2 weeks, fragment heals in place, patient regains normal function. SMALL FRAGMENTS (under 1cm diameter): Surgery less urgent. OPTION 1: Remove small fragments arthroscopically (leave small defects - often asymptomatic or minimal symptoms). Defects under 1cm usually don't need cartilage repair (can leave as is). OPTION 2: Conservative management initially. If fragments cause mechanical symptoms (catching, locking), remove arthroscopically. TIMING: Can wait 4-8 weeks to see if symptoms settle. Not critical to operate immediately for small fragments. FRAGMENT LOCATION MATTERS: PATELLA FRAGMENTS (from medial patella facet): High-impact area. Larger fragments (over 1-2cm) should be fixed. Small fragments can be removed. LATERAL FEMORAL CONDYLE FRAGMENTS (from lateral condyle where patella impacts during dislocation): Weight-bearing area. Larger fragments (over 1cm) should be fixed urgently. Small fragments may be removed. WHAT TO DO NOW: GET MRI URGENTLY (if not already done). MRI shows fragment size, location, and if still in place vs displaced. ASSESSMENT BY ORTHOPAEDIC SURGEON WITHIN 1-2 WEEKS. Surgeon will determine fragment size and recommend fixation vs removal vs observation. IF FRAGMENT FIXATION RECOMMENDED: Schedule surgery within 2-3 weeks (sooner is better - fragment viability decreases each day). DO NOT WEIGHT-BEAR FULLY on injured leg until surgeon assesses (can walk gently with crutches, but avoid pivoting, squatting, stairs - don't dislodge fragment further). PREVENT RECURRENT DISLOCATION: Patellar dislocation has 30-50% recurrence risk. After healing osteochondral fracture, address patellar stability (physiotherapy for VMO strengthening, consider patellar realignment surgery if high-risk anatomy like trochlear dysplasia, patella alta, or increased Q-angle). Recurrent dislocations cause ADDITIONAL osteochondral damage (cumulative cartilage injury leads to early patellofemoral arthritis). BOTTOM LINE: Large fragments (over 1cm) require URGENT assessment and likely surgery within 2-3 weeks. Small fragments less urgent. Don't delay - get MRI and orthopaedic consultation within 1-2 weeks of injury to determine best treatment plan.

Question 4

Can osteochondral defects heal on their own or do they always need surgery?

Accepted Answer

Healing potential depends on DEFECT SIZE, PATIENT AGE, LESION TYPE, and STABILITY. CAN HEAL WITHOUT SURGERY: STABLE OCD (osteochondritis dissecans) IN CHILDREN/ADOLESCENTS with OPEN GROWTH PLATES: 50-60% heal with activity restriction 3-6 months. Younger patients have better healing capacity. SMALL BONE MARROW EDEMA LESIONS (under 1cm, no cartilage disruption): May resolve with protected weight-bearing 6-12 weeks. Bone marrow edema represents bone stress without structural failure - can heal if rested. VERY SMALL OSTEOCHONDRAL DEFECTS (under 5mm diameter): Often asymptomatic, may not progress. Can observe with activity modification. HEALING MECHANISM: Bone component CAN heal (has blood supply). Bone marrow edema gradually resolves over 6-12 months if area protected from excessive loading. However, overlying CARTILAGE DOES NOT HEAL (avascular tissue). So "healing" means bone heals but cartilage defect remains - may be stable and asymptomatic if small. CANNOT HEAL WITHOUT SURGERY (WILL GET WORSE): UNSTABLE OCD LESIONS: Lesion lifting off bone (fluid signal surrounding lesion on MRI) will NOT heal conservatively. Will detach becoming loose body causing progressive damage. REQUIRES surgery. ACUTE LARGE OSTEOCHONDRAL FRACTURE FRAGMENTS (over 1cm): Will NOT reattach spontaneously. Fragment becomes displaced loose body. REQUIRES fixation or removal. ADULT OCD (closed growth plates): Less than 20% heal conservatively (lost healing potential with skeletal maturity). LARGE DEFECTS (over 2-3cm): Do not heal spontaneously. Bone marrow edema may resolve but structural defect remains. Symptomatic defects require surgery. PROGRESSIVE DEFECTS: If defect enlarging or symptoms worsening despite conservative treatment → surgery indicated (defect progressing, not healing). TRIAL CONSERVATIVE TREATMENT: Reasonable to try 3-6 months conservative management for: Small-medium stable defects, Bone marrow edema without unstable fragment, Young patients with healing potential, OCD in children with open growth plates. CONSERVATIVE TREATMENT: Activity restriction (no running, jumping, pivoting), Protected weight-bearing if severe (crutches 4-8 weeks), Physiotherapy (maintain motion and muscle strength), Serial MRI monitoring every 3 months (assess healing). IF NO IMPROVEMENT AFTER 3-6 MONTHS: Conservative treatment failed. Proceed to surgery. Don't wait years hoping for healing (defect may worsen, fragment may detach). WHEN SURGERY CLEARLY NEEDED (DON'T TRY CONSERVATIVE): Unstable lesion on MRI (fluid completely around lesion), Mechanical symptoms (catching, locking, giving way), Acute large displaced osteochondral fracture, Failed 3-6 months conservative treatment, Adult with symptomatic defect (low healing potential). BOTTOM LINE: Some lesions CAN heal (stable OCD in children, small bone marrow edema), but many CANNOT (unstable lesions, large defects, adult OCD). Trial conservative treatment reasonable for appropriate cases, but if no improvement in 3-6 months, proceed to surgery. Don't delay surgery indefinitely for lesions that won't heal - early intervention prevents progression and gives better outcomes than delayed treatment of worse defect.

Medical Disclaimer

Knee Cartilage Damage - Osteochondral Defects (Damaged Knee Joint Surface)

📖What is Knee Cartilage Damage - Osteochondral Defects (Damaged Knee Joint Surface)?

🔬What Causes It?

⚠️Risk Factors

You may be at higher risk if:

🛡️Prevention