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An intramedullary rod, also known as an intramedullary nail (IM nail) or inter-locking nail or Küntscher nail (without proximal or distal fixation), is a metal rod forced into the medullary cavity of a bone. IM nails have long been used to treat fractures of long bones of the body.
Internal fixation refers to fixation of screws and/or plates, intramedullary rods and other devices to enable or facilitate healing. Rigid fixation prevents micro-motion across lines of fracture to enable healing and prevent infection, which happens when implants such as plates (e.g. dynamic compression plate) are used.
Orthopedic implant example seen with X-ray. An orthopedic implant is a medical device manufactured to replace a missing joint or bone, or to support a damaged bone. [1] The medical implant is mainly fabricated using stainless steel and titanium alloys for strength and the plastic coating that is done on it acts as an artificial cartilage. [2]
After definitive fixation they are then removed. The pins are usually removed four weeks post operation. [1] They can be used for definitive fixation if the fracture fragments are small (e.g. wrist fractures and hand injuries). In some settings they can be used for intramedullary fixation of bones such as the ulna.
Fixation in orthopedics is the process by which an injury is rendered immobile. [1] This may be accomplished by internal fixation , using intramedullary rod , Kirschner wire or dynamic compression plate ; or by external fixation , using a spanning external fixator , Taylor Spatial Frame or Ilizarov apparatus .
Orthopedic surgeon making adjustments to a metal plate in a patient's ankle. An orthopedic plate is a form of internal fixation used in orthopaedic surgery to hold fractures in place to allow bone healing [1] and to reduce the possibility of nonunion.
Küntscher invented what is known as the Küntscher nail, an internal fixation device used to maintain the position of the fracture fragments during healing. The nail is rigid and has a cloverleaf shape in cross-section. Küntscher first performed the process using the nail in November 1939 at the University Department of Surgery in Kiel.
Femur (top) healed while improperly aligned. Poor blood supply which leads to the death of the osteocytes. Bone cell death also depends on degree of fracture and disruption to the Haversian system. Condition of the soft tissues. Soft tissue between bone ends restricts healing. Nutrition and drug therapy. Poor general health reduces healing rate.