Cartilage outcomes

Recovery After Cartilage Treatment

Evidence base

Searle HKC, Raj S, Ridha A, Ahmed I, Khatri C, Metcalfe A, Smith N. The recovery trajectory of people undergoing treatment for knee articular cartilage damage: A systematic review and meta-analysis. Knee. 2025 Oct;56:211-223. doi: 10.1016/j.knee.2025.05.031. Epub 2025 Jun 4. PMID: 40472679.

This study was conducted by our team at University Hospitals Coventry and Warwickshire to better understand how patients recover over time after different cartilage treatments.

Key points

  • Most patients improve after cartilage treatment, regardless of the type of treatment
  • The greatest improvement occurs in the first 12 to 24 months
  • Improvements are generally maintained up to 5 years
  • Microfracture may show a decline in outcomes after 2 to 3 years
  • Cell-based treatments show more sustained long-term improvement
  • This helps explain why different treatments often appear similar in studies

Why is this important?

Cartilage damage in the knee is common and can cause significant pain and limitation in activity.

There are several treatment options, including:

  • physiotherapy
  • microfracture
  • scaffold-based repair
  • cell-based therapies such as ACI

Patients often ask which treatment is best. This study, carried out by our research group, helps answer a slightly different but important question: how do patients recover over time?

What did the study involve?

This was a systematic review of prospective studies, meaning it analysed multiple high-quality studies over time.

It included patients treated with:

  • non-operative treatment
  • microfracture
  • scaffold-based repair
  • cell-based cartilage repair

Outcomes such as pain, function, and activity levels were tracked over time using validated scores including IKDC, KOOS, and Lysholm.

What does recovery look like?

Across all treatments, a consistent pattern was seen:

  • Rapid improvement in the first 6 to 12 months
  • Continued improvement up to around 24 months
  • A plateau phase after this, with stable outcomes

This pattern was consistent across the studies analysed by our team.

Differences between treatments

Microfracture

  • Improves symptoms early
  • Often plateaus by 12 months
  • Some patients experience worsening symptoms after 2 to 3 years
  • In some cases, pain can return towards baseline by 3 years

Scaffold-based repair

  • Shows steady improvement over time
  • Outcomes appear better than microfracture
  • Limited long-term data beyond 3 years

Cell-based therapies (e.g. ACI)

  • Larger improvements in function and symptoms
  • Improvement continues up to around 24 months
  • Results are maintained up to 5 years

Non-operative treatment

  • Also leads to improvement over time
  • May be suitable for some patients, particularly with lower demands

What does this mean for you?

The key message from this study is that most patients improve over time, regardless of treatment.

This is important because:

  • It explains why many studies show similar outcomes between treatments
  • It highlights the importance of patience during recovery
  • It supports shared decision-making based on individual goals

For higher-demand patients or larger defects:

  • More advanced treatments may provide more sustained improvement

Key considerations

  • Recovery after cartilage treatment takes time, often up to 1 to 2 years
  • Early improvement is common, but long-term durability varies by treatment
  • Microfracture may not provide lasting results in some patients
  • Treatment choice should be individualised based on symptoms, goals, and lesion characteristics