Large Osseous Defect Reconstruction Using a Custom Three-Dimensional Printed Titanium Truss Implant

Treatment of large osseous defects remains a difficult surgical challenge. Autografts and allografts have been known to undergo late collapse, because these options are not specifically designed to withstand the high loads of the foot and ankle. The inability to achieve the correct shape for reconstruction further limits their application. Large osseous defects will result during salvage after failed Lapidus bunionectomy, explantation of failed total ankle replacements, and nonunion of Evans calcaneal osteotomy. Each of 3 patients received a 4WEB custom 3-dimensional (3D) titanium truss implant (Patient Specific Custom Implant; 4WEB Medical, Inc., Frisco, TX) for reconstruction. The mean follow-up period was 17.33?±?3.51 months. Significant improvement was seen in pain, with a successful return to activities of daily living. The 12-month postoperative computed tomography findings demonstrated incorporation of the implant to the surrounding cortical and cancellous bone. No signs of delayed complications, such as stress shielding or implant failure, were found. This is the first case series to describe the use of a custom 3D-printed titanium truss implant to successfully contribute to reconstruction in the setting of failed elective foot and ankle surgery. This technology might play an important role in limb salvage of osseous defects that would otherwise require bone block arthrodesis with structural allograft or autograft bone.     

Comparative Analysis of the Reconstruction of Individual Hip Anatomy Using 3 Different Cementless Stem Designs in Patients With Primary Hip Osteoarthritis

Background

We questioned whether there was a radiographic difference in hip geometry reconstruction and implant fixation between 3 different cementless stem design concepts in patients with primary end-stage hip osteoarthritis.

跟骨解剖型钛板治疗累及关节面的跟骨骨折

目的评价跟骨解剖型钛板治疗累及关节面的跟骨骨折的临床疗效。方法对38例累及关节面的跟骨骨折患者(42足)采用跟骨解剖型钛板内固定。结果患者均获随访,时间8~18个月。按Maryland足部评分系统评价疗效:优30足,良8足,可4足,优良率90.4%。结论跟骨解剖型钛板治疗累及关节面的跟骨骨折,内固定坚强,可早期功能锻炼,疗效满意。