Introduction/Purpose: Arthroscopic bone marrow stimulation for osteochondral lesions of the talus (OLT) has presented promising clinical outcomes in recent studies. However, there were few studies which had investigated long-term clinical outcomes. The purpose of this study is to evaluate the long-term outcomes of arthroscopic bone marrow stimulation for osteochondral lesion of the talus and to identify prognostic factors that affect the outcome. Methods: Between January 2001 and December 2007, 159 patients (172 ankles) with OLT underwent arthroscopic bone marrow stimulation as a primary surgery. Clinical outcomes were assessed using visual analog scale (VAS), American Orthopaedic Foot & Ankle Society (AOFAS) scores, Foot and Ankle Outcome Score (FAOS) and re-operation rate. Factors associated with reoperation were evaluated using bivariate analysis. Kaplan-Meier plot showed survival outcomes of OLT in long-term follow-up. Results: The mean follow-up time was 12.7 years (range 10.1-16.8) and the mean size of the lesion was 105.4 mm2 (range 19.8-322.8). The mean VAS improved from 7.21 ± 1.71 to 1.76 ± 1.60. The mean preoperative AOFAS score was 57.98 ±14.43 and the mean postoperative AOFAS was 82.91 ± 11.58. FAOS at the time of final follow-up was comparable with those of previous literatures which showed outcomes of surgical treatments of OLT in short-and mid-term follow-up. Re-operation rate was 6.40 % (11 patients with 12 revision surgery) including seven cases of re-arthroscopic bone marrow stimulation, and five cases of OAT. According to bivariate analysis, significant factor associated with re-operation was large sized OLT in preoperative MRI measurement. Conclusion: Arthroscopic bone marrow stimulation for osteochondral lesion of the talus has made satisfactory clinical outcomes through long-term follow-up over 10 years.

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We examined whether recombinant human bone morphogenetic protein-2 (rhBMP-2) when applied to collagen membranes, would reinforce them during guided bone regeneration. Four critical cranial bone defects were created and treated in 30 New Zealand white rabbits, including a control group, critical defect only; group 1, collagen membrane only; group 2, biphasic calcium phosphate (BCP) only; group 3, collagen membrane + BCP; group 4, collagen membrane with rhBMP-2 (1.0 mg/mL); group 5, collagen membrane with rhBMP-2 (0.5 mg/mL); group 6, collagen membrane with rhBMP-2 (1.0 mg/mL) + BCP; and group 7, collagen membrane with rhBMP-2 (0.5 mg/mL) + BCP. After a 2-, 4-, or 8-week healing period, the animals were sacrificed. The combination of collagen membranes with rhBMP-2 and BCP yielded significantly higher bone formation rates compared to the other groups (control group and groups 1–5 < groups 6 and 7; p < 0.05). A 2-week healing period yielded significantly lower bone formation than that at 4 and 8 weeks (2 < 4 = 8 weeks; p < 0.05). This study proposes a novel GBR concept in which rhBMP-2 is applied to collagen membranes outside instead of inside the grafted area, thereby inducing quantitatively and qualitatively enhanced bone regeneration in critical bone defects.