The cancellous screw is a core orthopedic internal fixation implant specially designed for spongy bone tissue fixation, widely applied in the treatment of metaphyseal fractures, joint peripheral fractures and osteoporotic bone injuries. Different from conventional cortical screws, it adopts a unique structural design tailored to the loose and porous characteristics of cancellous bone, providing powerful holding force and stable fixation effect for low-density bone tissue. Following standardized AO orthopedic principles, the cancellous screw has become an essential implant for routine fracture fixation and orthopedic reconstructive surgery in modern orthopedics.
The most prominent feature of the cancellous screw is its wide thread pitch, deep thread depth and large-diameter threaded section. This specialized structure can fully engage with porous cancellous bone, greatly increasing the contact area between the screw and bone tissue. It effectively avoids screw loosening, withdrawal and fixation failure that commonly occur in osteoporotic bone fixation, delivering superior pull-out resistance and torsional stability. Most cancellous screws adopt a partial thread design, which enables accurate compression of fracture ends while reserving space for bone healing, promoting tight attachment of broken bone segments.
Clinically, the cancellous screw has extensive application scenarios, covering proximal and distal metaphysis fractures of long bones, pelvic fractures, calcaneal fractures, and intra-articular fractures of the knee, shoulder and ankle. It is also widely used for bone graft fixation, avulsion fracture repair and postoperative corrective orthopedic fixation. For elderly patients with severe osteoporosis, this screw shows more prominent clinical advantages than ordinary cortical screws, effectively solving the problem of insufficient holding power of conventional implants in fragile cancellous bone tissue.
Manufactured from high-quality medical-grade titanium alloy and stainless steel, the cancellous screw possesses excellent biocompatibility, mechanical strength and corrosion resistance. The smooth precision-polished surface reduces soft tissue irritation and intraoperative bone damage, lowering the risk of postoperative inflammation and tissue adhesion. The standardized dimensional specification ensures perfect compatibility with mainstream orthopedic plate systems and surgical instruments, supporting flexible intraoperative matching and efficient implantation.
With reliable fixation performance, strong bone adaptability and high clinical safety, the cancellous screw effectively improves the success rate of fragile bone fixation, shortens patient rehabilitation cycle, and reduces long-term postoperative complications. As a classic and mature orthopedic implant, it maintains irreplaceable clinical value in the field of orthopedic trauma and reconstructive surgery.