The artificial hip prosthesis imitates the structure of the human hip joint, and the stem of the prosthesis is inserted into the medullary cavity of the femur, and the head is used to form a rotation with the joint socket or the metal cup of the prosthesis to realize the flexion, extension and movement of the femur. The artificial hip prosthesis is divided into unipolar, unipolar total hip, double-acting half-hip and total hip, replaceable head double-acting half-hip and total hip forms. Artificial hip joint – main technical performance indicators 1, materials: femoral head stem are made of titanium alloy, cobalt-chromium-molybdenum alloy, ultra-low carbon stainless steel materials, plastic inner socket and acetabulum are made of non-toxic ultra-high polymer polyethylene, metal cups are made of titanium alloy (with titanium alloy, cobalt-chromium-molybdenum alloy femoral head stem) and ultra-low carbon stainless steel materials. 2, Composition: a) monopolar consists of femoral head shank; b) monopolar full hip consists of femoral head shank and plastic acetabulum; c) double-headed half hip consists of femoral head shank, plastic inner socket and metal cup; d) double-action full hip consists of femoral head shank, plastic inner socket, metal cup and plastic acetabulum. 3.Processing method: Titanium alloy product blank adopts hot isostatic pressing processing method. Cobalt-chromium-molybdenum alloy adopts the processing method of casting, and stainless steel adopts the processing method of forging, and then it is shaped by machining and surface treatment. Product indications Suitable for old femoral neck fracture not healing; ischemic necrosis of the femoral head; therapeutic hip tuberculosis; bone tumor of the femoral head; flat hip; osteoarthritis with heavy pain and affecting the function of the hip joint; fresh fracture of the lower part of the head of the femoral neck in elderly people over 60 years old and other conditions. The product can partially replace the function of the joint after replacing the original joint. Usage 1. Product selection: The product is divided into 38mm~52mm head diameter according to clinical needs, and every 2mm is a specification. Before surgery, the size of the replacement femoral head and acetabulum is measured with calipers according to the X-ray film and according to the patient’s fatness, according to the magnification of 1.2~1.1. For example, if the radiograph shows a head diameter of 55mm, i.e. 55mm/1.1mm=50mm or 55mm/1.2=46mm, a femoral head of 46, 48 or 50mm should be prepared before surgery, sterilized and ready for use. 2, Sterilization method (for non-sterile joints): disassemble the metal cup, plastic socket and head shank during sterilization. Metal cup and head shank can be sterilized by autoclaving, boiling or sterilizing liquid soaking for 30 minutes; plastic socket is recommended to be sterilized by sterilizing liquid soaking for 30 minutes, do not use autoclaving to avoid problems such as deformation of plastic socket. 3, during surgery, measure the removed femoral head and choose the appropriate prosthesis according to its size; if the femoral head has been crushed or deformed and cannot be measured, insert a different size prosthesis into the acetabulum to try its size and check whether there is negative pressure when it is extracted; the one with negative pressure is preferred when choosing. Note: When selecting products, if the femoral head part is larger than the acetabulum, the product may be painful after surgery; if the femoral head part is smaller than the acetabulum, the acetabulum may be penetrated due to wear and tear. Suggestion: choose the product with the closest size as possible, and follow the principle of preferring small to large, loose to tight, and short to long. 4. The artificial hip prosthesis must be implanted into the human body using hip replacement instruments (see the instruction manual of the instruments for details of the usage and steps). 5.After implantation, use bone cement to fix the socket cup and use a bone cement gun to inject bone cement into the femoral medullary cavity under pressure to fix the prosthesis. Note: The cancellous bone in the proximal femur should be removed as much as possible to increase the strength of the bone cement fixation. 6.The product should be stored in a room with relative humidity not more than 80%, without corrosive gas and good ventilation, and all the packaging and all kinds of markings should be protected. The use of products without markings and labels is strictly prohibited. 7.The product should only be opened before sterilization, and the product number on the product label should be accurately recorded in the medical record or surgical record before use for product tracing. Precautions for artificial hip joint prosthesis implantation 1, the hospital should pay attention to the selection of indications and joint prosthesis, special cases should be designed and manufactured separately, otherwise it may affect the surgical effect or cause surgical failure. 2.Stainless steel material prosthesis is only suitable for elderly people over 65 years old. 3.The joint prosthesis is disposable and the second use is strictly prohibited. 4.Care should be taken to protect the surface of the prosthesis during surgery to prevent surface scratches and collisions, otherwise it may affect the corrosion resistance of the prosthesis. 5, surgery should pay attention to the expansion of the bone marrow cavity to be moderate, not too large, or cause the prosthesis rotation loose, affecting the stability of the prosthesis after implantation. 6, the use of replaceable head joint prosthesis, must be tightened plastic inner socket and metal cup, and hip joint into the set of hip socket and hip joint stem locking, otherwise it will cause joint dislocation, loosening and other adverse consequences. 7, stainless steel material prosthesis shall not be implanted with other material prosthesis, otherwise it will cause electrochemical corrosion, the corrosion resistance of the material with lower pitting potential will be weakened, which will seriously affect the service life of the prosthesis or endanger human health. Postoperative care According to the clinical survey and relevant data reports, there are more complications after joint prosthesis replacement, the more prominent is due to osteoporosis in the elderly, joint prosthesis sinking loose, and eventually the stem of the prosthesis fracture. And from the clinical investigation, many patients started to exercise with weight 2 months after surgery, while the average person has just healed at 2 months and the joint prosthesis is not yet stable. The fracture of the lower part of the prosthetic femoral head stem is usually caused by the loosening of the prosthesis during implantation or improper care after implantation, not by the quality of the product. Therefore, patients are advised to undergo regular post-operative X-ray examinations, and with the doctor’s permission, they may only go down to the ground and do light flexion and extension exercises after at least six months, and weight-bearing exercises are strictly prohibited. At the same time, it is necessary for the doctor to inform the patient in writing about: the service life of the prosthesis; the time of the review; the fact that after the implantation of the prosthesis, it is not possible to replace all the functions of the original joint and that heavy sports and heavy work cannot be performed. Product life span and possible complications 1. The life span of hip joints made of different metal materials are: a) titanium alloy: 10-15 years; b) cobalt-chromium-molybdenum alloy: 10-15 years; c) ultra-low carbon stainless steel material: 4-6 years. 2. Possible complications: a) Infection: Generally due to individual patient specificity, resulting in metal allergy. b) Dislocation: generally due to improper sterilization, resulting in deformation of the plastic socket; or due to improper movement of the patient after surgery. c) Loosening: after using bone cement fixation, distant loosening may occur (generally prone to occur after more than 5 years). According to domestic and foreign academic reports: this phenomenon is not caused by the defect of the product itself, but by the defect of the method of bone cement fixation itself, which is a problem that modern medicine cannot solve yet. d) Fracture: If improper movement in the postoperative period, incapable of proper diagnosis and treatment, or if the product exceeds the predetermined period of use, the product will fatigue and fracture.