Application of 3 dimension-printed injection-molded polyether ether ketone lunate prosthesis in the treatment of stage Ⅲ Kienböck’s disease: A case report

BACKGROUND Polyether ether ketone(PEEK)is a high-performance medical polymer,and there are some clinical cases of PEEK prosthesis implantation.However,application of 3D-printed injection-molded PEEK lunate prosthesis for treatment of stage Ⅲ Kienböck’s disease has not been reported.This study’s purpose was to analyze the clinical efficacy of 3D-printed injection-molded PEEK lunate prosthesis in the treatment of stage Ⅲ Kienböck’s disease and thus provide a good therapeutic choice for Kienböck’s disease.CASE SUMMARY We report a patient with stage Ⅲ Kienböck’s disease.With the healthy lunate bone as reference,3D lunate reconstruction was performed using a mirroring technique.A PEEK lunate prosthesis was prepared by 3D printing and injection molding,and then it was inserted into the original anatomical position after removing the necrotic lunate bone.Wrist pain and function,anatomical suitability of the lunate prosthesis,and complications were evaluated and analyzed postoperatively.At the last visit(one year after surgery),the range of motion,grasp force,visual analog scale score and Cooney score of the affected wrist were significantly improved,and postoperative X-ray examination indicated that the lunate prosthesis had good anatomical suitability for adjacent bony structures.CONCLUSION The 3D-printed injection-molded PEEK lunate prosthesis demonstrated definite efficacy in treating stage Ⅲ Kienböck’s disease.

Three-dimensional printed talar prosthesis with biological function for giant cell tumor of the talus:A case report and review of the literature

BACKGROUND Giant cell tumors(GCT)are most commonly seen in the distal femur.These tumors are uncommon in the small bones of the hand and feet,and a very few cases have been reported.A giant cell tumor of the talus is rarely seen clinically and could be a challenge to physicians.CASE SUMMARY We report a rare case of GCT of the talus in one patient who underwent a new reconstructive surgery technique using a three-dimensional(3D)printing talar prosthesis.The prosthesis shape was designed by tomographic image processing and segmentation using technology to match the intact side by mirror symmetry with 3D post-processing technologies.The patient recovered nearly full range of motion of the ankle after 6 mo.The visual analogue scale and American Orthopaedic Foot and Ankle Society scores were 1 and 89 points,respectively.CONCLUSION We demonstrated that 3D printing of a talar prosthesis is a beneficial option for GCT of the talus.

Stereolithography printing of bone scaffolds using biofunctional calcium phosphate nanoparticles

Calcium phosphate(CaP)has been widely used for bone defect repair due to good biocompatibility and osteoconductivity.Additive manufacture of calcium phosphate bioceramics with tailored architectures and improved mechanical properties has recently attracted great attention.Herein,calcium phosphate nanoparticles with the size of~89-164 nm were synthesized by the hydrothermal treatment of amorphous calcium phosphate(ACP)precursors at 180°C for 24 h.Biofunctional elements including Mg,Sr and Zn have been doped into these calcium phosphate nanoparticles.Our results revealed that Mg^(2+)ions played critical roles in formation of whitlockite-type calcium phosphate(not hydroxyapatite)from ACP precursors.Moreover,gyroid scaffolds with bionic triply periodic minimal surface structures were fabricated using stereolithography printing of these calcium phosphate nanoparticles,which are likely used as biofunctional scaffolds for bone repair.

Subscapular Bursa： Anatomy and Magnetic Resonance Appearance

The definition of the subscapular bursa （SSB） remains controversial.One researcher demonstrated that SSB was a separate pouch.[l] However,others believed that SSB was actually the superior subscapularis recess （SSR）,which is an outpouching of the glenohumeral joint capsule.[4] Whether or not the SSB and SSR are two different bursae must be confirmed.Furthermore,the fluid in the SSR revealed in magnetic resonance （MR） imaging has been regarded as an indication for a diagnosis of frozen shoulder.[3] Considering that the SSB and SSR are two different structures with a close spatial relationship,recognition of the MR appearance of SSB might have important diagnostic implications.The purposes of this study were to describe the anatomy of the SSB using a three-dimensional （3D） visualization technique based on the Chinese visible human （CVH） and to explore the MR appearance of the SSB.