Individual biological type cushion block for bone defect in total knee replacement

Abstract

The invention discloses an individual biological type cushion block for bone defect in total knee replacement. The individual biological type cushion block comprises a cushion block base body fixed to a bone bed through a fixing pile. The cushion block base body comprises a solid layer and a porous structure. The upper surface of the solid layer is fixed to a tibia support in a press fit contact mode. The cushion block base body and the fixing pile are integrally manufactured by adoption of a 3D printing technology. The individual biological type cushion block has the advantages of small osteotomy amount, good fixation in near and long term, smooth transition to surface of natural bone of the human body and no stress concentration.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a personalized bio-type spacer used for bone defects in total knee arthroplasty. Background technique [0002] Currently, bone defects in the knee can be caused by many reasons, including: arthritic varus genu deformity, avascular necrosis, trauma, high tibial osteotomy, and revision knee surgery. Bone defects on the femoral or tibial side are divided into: cavity-type defects and segmental-type defects. In the prior art, bone defects can generally be treated by the following methods: [0003] Bone cement filling: Bone cement filling is suitable for bone defects with a cavity-type defect depth less than 5 mm, especially in elderly patients; however, the relatively poor biomechanical properties of bone cement make it unsuitable for segmental and larger bone defects , especially in young patients; [0004] Bone graft (autologous bone or allogeneic bone): bone...

AI Technical Summary

Problems solved by technology

[0004] Bone graft (autologous bone or allogeneic bone): bone graft (autologous bone or allogeneic bone) is suitable for hollow bone defects between 5mm and 10mm, especially for young patients; The safety, bone remodeling and integration ability are poor, leading to the failure of bone grafting;

[0005] Customized prosthesis: customized prosthesis is mainly for patients with femoral and tibial deformities and severe bone defects, especially patients after total knee arthroplasty; however, the range of motion of customized prosthesis is limited and postoperative satisfaction is low;

[0006] However, the metal pads currently used have the disadvantages of large amount of osteotomy, nonunion, collapse, and displacement. In addition, the sharp edges of the metal pads cause soft tissue pain, etc.

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