At short-term followup, the microfracture technique appeared to repair severe cartilage damage with a good functional outcome. Age was not shown to be a limiting factor.

We determined whether the early improvement in symptoms and function after microfracture in the management of articular cartilage defects of the talus is maintained at mid term follow-up. Factors influencing outcome and postoperative magnetic resonance imaging were also evaluated. We performed data collection prospectively using the Hannover Scoring System for the ankle (HSS) and a Visual Analog Scale (VAS) for pain and function preoperatively, at 1 +/- 0.1 year (45 ankles), 2 +/- 0.4 years (45 ankles), and at an average of 5.8 +/- 2.0 years (39 ankles) postoperatively. MRI was used to assess cartilage repair tissue based on the following variables: degree of defect repair and filling of the defect, integration to border zone, surface of the repair tissue, structure of the repair tissue and subchondral bone alterations. Comparing the outcome scores of the last follow-up to the previous follow-up points, the HSS and the VAS (pain, function and satisfaction) showed no deterioration. Four ankles, however, underwent further surgery to address the chondral defect and were regarded as failures. A body mass index greater than 25 kg/m(2) and having severe post-traumatic cartilage damage appeared to be negative prognostic factors. Results for patients older than 50 years were not inferior to those in younger patients. Microfracture arthroplasty induces repair of localized articular cartilage defects of the talus maintaining the encouraging early results at mid term follow-up.

Limb rotation had a highly statistically significant effect on measured anatomic alignment and mechanical angles. A correlation between limb rotation, anatomic mechanical angle, mechanical angles measured at femur and tibia and the femoral component distance ratio was established. As the anatomic mechanical angle and the femoral component distance ratio change linearly in the range of 20 degrees internal and external limb rotation, a calculation of the femoral component distance ratio could be used to re-calculate the limb rotation at the time of radiographic assessment to evaluate the evidence of a long leg radiograph.

Background:Autologous chondrocyte implantation (ACI) and microfracture are established treatments for large, full-thickness cartilage defects, but there is still a need to expand the clinical and health economic knowledge of these procedures.Purpose:To confirm the noninferiority of ACI compared with microfracture.Study Design:Randomized controlled trial; Level of evidence, 2.Methods:Patients were randomized to be treated with matrix-associated ACI using spheroid technology (n = 52) or microfracture (n = 50). Both procedures followed standard methods. Patients were assessed by the Knee injury and Osteoarthritis Outcome Score (KOOS), MOCART (magnetic resonance observation of cartilage repair tissue) scoring system, Bern score, modified Lysholm score, International Cartilage Repair Society (ICRS) rating (histological and immunochemical scoring after rebiopsy 24 months after implantation), and International Knee Documentation Committee (IKDC) examination form. The main assessments were conducted 24 months after study treatment.Results:In the primary intention-to-treat analysis, the overall KOOS score for both ACI and microfracture yielded a statistically significant improvement relative to baseline. According to the between-group analysis, ACI passed the test of noninferiority compared with microfracture; thus, the primary goal of the study was achieved. The KOOS subscores yielded the same qualitative results as the overall KOOS score (ie, for each of these, noninferiority was demonstrated), and in 1 case (Activities of Daily Living subscore), the threshold for superiority was passed. The subgroup analyses did not yield any clear evidence of an association between treatment effect and any of the categories investigated (age, diagnosis, defect localization, sex). A histological analysis of biopsies from 16 patients (ACI: n = 9; microfracture: n = 7) suggested a better quality of repair in the patients treated with ACI.Conclusion:The efficacy of both ACI and microfracture was demonstrated with respect to both functional outcomes and morphological repair. The primary analysis confirmed the statistical hypothesis of the noninferiority of ACI, even for relatively small cartilage defects (1-4 cm2) treated in this study, the indication for which microfracture is generally accepted as the standard of care. ACI showed significant superiority in the KOOS subscores of Activities of Daily Living at 24 months and Knee-related Quality of Life at 12 months.Registration:NCT01222559 ( ClinicalTrials.gov identifier).

The device appears to be an effective reconstructive treatment option for large full-thickness cartilage and osteochondral lesions of the knee in middle-aged patients.