Knee Cartilage Defect Patients Enrolled in Randomized Controlled Trials Are Not Representative of Patients in...

Area of Science:

• Orthopedics
• Biomedical Engineering
• Clinical Research

Background:

• Knee cartilage defects are common, causing significant socioeconomic burden and potential lifelong disability.
• Approximately 60% of knee arthroscopies reveal cartilage defects, yet many such patients are excluded from clinical trials.
• This highlights a potential disparity between patients in research and those in clinical practice.

Purpose of the Study:

• To investigate whether patients enrolled in randomized controlled trials (RCTs) for cartilage repair are a selected group compared to the general population of patients with cartilage defects.
• To assess the representativeness of current RCT inclusion criteria against a broader clinical cohort.

Main Methods:

• A systematic review of published randomized controlled trials (RCTs) on cartilage repair was conducted to identify common inclusion criteria.
• These criteria were applied to a cohort of patients treated at a cartilage repair center.
• Patient functional level was assessed using the Lysholm knee score, alongside data on previous surgery, defect size, and location.

Main Results:

• Common RCT inclusion criteria included single femoral condyle lesions, age 18-40, and lesion size 3.2-4.0 cm².
• Only 6 out of 137 referred patients met all seven RCT inclusion criteria analyzed.
• Previous cartilage repair and multiple lesions were significantly associated with lower Lysholm scores (P < 0.002).

Conclusions:

• The heterogeneity of patients with cartilage defects and the varied inclusion criteria in RCTs raise questions about their representativeness.
• Findings from published RCTs may not accurately reflect outcomes in the general population of patients with cartilage defects.
• This suggests a need to re-evaluate RCT eligibility criteria to improve the generalizability of cartilage repair research.