I agree to the terms of this website How did you hear about us? Knee joint replacement is intended for use in individuals with joint disease resulting from degenerative, rheumatoid and post-traumatic arthritis, and for moderate deformity of the knee. Joint replacement surgery is not appropriate for patients with certain types of infections, any mental or neuromuscular disorder which would create an unacceptable risk of prosthesis instability, prosthesis fixation failure or complications in postoperative care, compromised bone stock, skeletal immaturity, severe instability of the joint, or excessive body weight.
Dislocation of the prosthesis can occur immediately after surgery if you move your leg into a prohibited position. It is therefore necessary to avoid extremes of internal rotationforward flexionand adduction for about 12 weeks until a thick capsule forms around the artificial joint.
If you dislocate, you will need to be put under deep anaesthesia so your hip muscles can relax sufficiently to allow the artificial hip joint to be reduced. Care should be taken to avoid dislocation as the sciatic nerve, which supplies large leg muscles, is in danger of damage when your hip dislocates.
Loosening of the stem component is a late complication that most often occurs years after total hip replacement.
It can be confirmed with X-rays. Risk factors for this include age less than 50 years -- such people usually being more activeweight more than 80 kilogramsand a high level of physical activity at any age. Mild trauma can fracture the femur around a prosthesis stem, especially if the bone is osteoporotic.
The main long-term threat to hip replacements appears to be polyethylene and metallic wear debris from the interacting surfaces of the components.
This debris can cause inflammation in adjacent tissues that results in bone loss which, in turn, leads to prosthesis loosening. Fracture, dislocation, malpositioning of components, infection around the implant, poor cementing technique, and certain stem designs can also contribute to loosening of the stem component.
Thigh pain is the primary symptom of stem loosening, especially during walking. This pain often radiates to the knee. Loosening of previous generation actabular components increases markedly after years of function.
Obesity and strenuous activities can contribute to failure of the acetabular component. Loosening of the acetabular cup is often signaled by pain in the groin region upon going from a sitting to a standing position.
Revision surgery, to correct a loose implant, is generally more difficult and takes longer to perform than the initial hip replacement.Basic concepts of total joint arthroplasty. SHELL. The current acetabular implant is a cementless 2-component cup. A metal shell for bony ingrowth + a polyethylene liner (sometimes metal or ceramic) that snaps into the shell and articulates with the femoral head..
The modern acetabular implant is a "press-fit" design (it is not cemented). THE CEMENTLESS METAL ON METAL RECONSTRUCTION INTRODUCTION Total hip replacement surgery (THR) has become a highly successful reconstructive surgical procedure.
Many thousands of patients benefit from the procedure annually. Of the result is that small plastic wear particles are released into the joint. Often these plastic particles.
The use of longer-stem cementless implants during revision surgery is an additional risk factor for fracture. Nerve injury — The incidence of nerve injury in primary total hip arthroplasty ranges from 0 .
An artificial knee joint can be secured into the bone in a number of different ways. In essence, there are two main types of fixation – with cement or cementless: If the bone structure lacks stability, the knee joint replacement is secured using bone cement. ABSTRACT: Between and , 56 femoral fractures associated with cementless total hip arthroplasty (THA) were evaluated and compared to a randomly selected cementless THA control group.
Chapter 8 JOINT REPLACEMENT 8 Modular, Cementless, Screw-in Total Hip Replacement. Now available with improved three part stem. (TPS) The Helica System of Total Hip .