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Background: The treatment of symptomatic cartilage defects of the patella is particularly challenging, and no gold standard is currently available. Purpose: To evaluate the clinical results of a biphasic cell-free collagen-hydroxyapatite scaffold and to evaluate osteochondral tissue regeneration with magnetic resonance imaging (MRI). Study Design: Case series; Level of evidence, 4. Methods: Thirty-four patients (18 men and 16 women; mean ± SD: age, 30.0 ± 10 years) were treated by scaffold implantation for knee chondral or osteochondral lesions of the patella (area, 2.1 ± 1 cm2). The clinical evaluation was performed prospectively at 12 and 24 months via the IKDC (International Knee Documentation Committee; objective and subjective) and Tegner scores. MRI evaluation was performed at both follow-ups in 18 lesions through the MOCART score (magnetic resonance observation of cartilage repair tissue) and specific subchondral bone parameters. Results: A statistically significant improvement in all the scores was observed at 12- and 24-month follow-up as compared with the basal evaluation. The IKDC subjective score improved from 39.5 ± 14.5 to 61.9 ± 14.5 at 12 months (P > .0005) with a further increase to 67.6 ± 17.4 at 24 months of follow-up (12-24 months, P = .020). The MRI evaluation showed a stable value of the MOCART score between 12 and 24 months, with a complete filling of the cartilage in 87.0% of the lesions, complete integration of the graft in 95.7%, and intact repair tissue surface in 69.6% at final follow-up. The presence of osteophytes or more extensive bony overgrowth was documented in 47.8% of the patients of this series, but no correlation was found between MRI findings and clinical outcome. Conclusion: The implantation of a cell-free collagen-hydroxyapatite osteochondral scaffold provided a clinical improvement at short-term follow-up for the treatment of patellar cartilage defects. Women had lower outcomes, and the need for realignment procedures led to a slower recovery. MRI evaluation showed some abnormal findings with the presence of bone overgrowth, but no correlation has been found with the clinical outcome. [ABSTRACT FROM AUTHOR]

The article evaluates the stability of the initial clinical improvement over time through documenting the imaging evolution of tissue regeneration process using magnetic resonance imaging analysis for up to 5 years. It examines 27 patients treated for knee chondral or osteochondral lesions. It looks at the use of osteochondral scaffold to treat chondral and osteochondral knee defects. Statistical improvement in all clinical scores during the two- and five-year follow-ups is also discussed.

The article presents a study which was carried out to evaluate the potential of a biomimetic osteochondral scaffold for treating osteochondritis dissecans (OCD) by analyzing the results obtained at two-year follow-up. It mentions that 27 consecutive patients who were affected by symptomatic knee OCD of the femoral condyles were employed in the study. It concludes that the biomimetic osteochondral scaffold proved to be a valid treatment option for knee OCD.

Background: Regenerative techniques, such as autologous chondrocyte implantation (ACI), have emerged as a potential therapeutic option for the treatment of chondral lesions, aiming to recreate a hyaline-like tissue in the damaged articular surface. The clinical application of the regenerative approach is well documented for different types of scaffold but mostly with an evaluation of the clinical outcome at short-term follow-up.Purpose: This study was conducted to analyze the clinical outcome obtained with arthroscopic second-generation ACI up to 7 years’ follow-up, to assess the durability of the results, and understand its real potential over time.Study Design: Case series; Level of evidence, 4.Methods: Sixty-two consecutive patients, 48 men and 14 women with a mean age of 28.1 ± 11.4 years, affected by chondral lesions of the femoral condyles were enrolled and treated with arthroscopic implantation of the bioengineered tissue Hyalograft C. The average size of the defects was 2.5 ± 1.0 cm2. Patients were evaluated with International Knee Documentation Committee (IKDC), EuroQol visual analog scale (EQ-VAS), and Tegner scores every year for 7 years, and a magnetic resonance imaging evaluation was performed.Results: A statistically significant improvement was observed in all scores from the basal evaluation to the 84 months’ follow-up. The IKDC subjective score increased from 39.6 ± 15.0 to 73.6 ± 18.8 at 12 months; a further slight improvement was observed at 24 months’ follow-up (76.5 ± 20.7), and then the results were stable and reached a final 7-year value of 77.3 ± 21.5. Seven cases (11%) failed. A better outcome was obtained in young active men, whereas the worst results were found in degenerative lesions or when previous surgery had been performed. Postoperative magnetic resonance imaging studies in 42 cases revealed a complete filling of the cartilage defect in 57% of the lesions, complete integration of the graft in 62% of cases, intact repair tissue surface in 50%, homogeneous repair tissue structure in 43%, and a graft signal-intensity score that was isointense with the adjacent native cartilage in 43% and 48% of the cases in dual T2–fast spin echo and 3-dimensional gradient echo with fat suppression sequences, respectively.Conclusion: The analysis of this group of homogeneous patients, prospectively evaluated every year for 7 years, shows that this bioengineered approach with the proper indications may offer good and stable clinical results over time. [ABSTRACT FROM PUBLISHER]

Background: In recent years, there has been an increasing interest in and awareness of the importance of subchondral bone, for its role in the pathogenesis of articular surface damage and for the care that should be taken when treating such damage.Purpose: The objective of this pilot clinical study was to test the safety and performance of a newly developed type I collagen-hydroxyapatite nanostructured biomimetic osteochondral scaffold that aims to regenerate cartilage and subchondral bone.Study Design: Case series; Level of evidence, 4.Methods: A multilayer gradient nano-composite scaffold was obtained by nucleating collagen type I fibrils with hydroxyapatite nanoparticles. Thirty patients (9 female, 21 male; mean age, 29.3 years) with knee chondral or osteochondral lesions were treated with scaffold implantation. Lesion size varied from 1.5 cm2 to 6.0 cm2. Twenty-eight patients were followed for 2 years and were clinically evaluated using the International Knee Documentation Committee and Tegner scores. At final follow-up, magnetic resonance imaging evaluation was performed in 24 patients, and they were evaluated with the MOCART (Magnetic Resonance Observation of Cartilage Repair Tissue) score.Results: The Tegner and International Knee Documentation Committee objective and subjective scores improved significantly from the baseline evaluation to the 6-, 12-, and 24-month follow-ups. Further analysis showed a slower recovery but the same results for patients who presented with adverse events, for older patients, for patients who underwent previous surgery, and for those with patellar lesions. In contrast, a faster recovery was observed in active patients. At magnetic resonance imaging evaluation, complete filling of the cartilage and complete integration of the graft was shown in 70% of the lesions. However, the subchondral lamina and bone were considered intact in a minority of cases (7% and 47%, respectively).Conclusion: This open 1-step procedure was used for the treatment of chondral and osteochondral knee defects. The present pilot study highlighted the safety and potential clinical benefit of the graded biomimetic osteochondral scaffold in promoting bone and cartilage tissue restoration by itself and with good clinical and magnetic resonance imaging results at the 2-year follow-up. [ABSTRACT FROM AUTHOR]