Table of Contents
What is Dorr classification?
The Dorr classification is a method of qualitative classification that is determined using anteroposterior and lateral plain radiographs of the hip joint. In our exploration of quantitative indices that are suitable for the Dorr classification, we found parameters that were easily measured on plain radiographs.
What is type C bone?
Type C bone is found predominantly in women of older age and with lower body weight [1] and it has both structural and cellular compromise. The cortices are thin with correlated loss of the medial and posterior cortices resulting in a “stovepipe” shape of the intramedullary canal [3].
What is a Type A femur?
Type A indicates thick and distinct cortices seen on AP and lateral radiographs, creating a narrow diaphyseal canal and “funnel shape” of the proximal femur. The lateral radiograph shows a thick curved posterior cortex (fin).
What is implant fixation?
Fixation techniques can either use cement or be cementless. Cemented fixation uses PMMA bone cement to grout the implant and bone together, while cementless fixation involves either a press-fit between the implant and bone, or specific design features that encourage bone growth into or onto the implant.
What is the difference between cemented and uncemented hip replacement?
Cemented and uncemented hip arthroplasties differ in how the prosthetic implant is fixed to the natural bone. A cemented hip arthroplasty relies on bone cement to fix the implants to the bone interface. Uncemented hip replacements rely on bone on-growth over specially designed implants.
What is femoral offset?
Femoral offset: general remarks and definitions. Femoral offset is the distance from the center of rotation of the femoral head to a line bisecting the long axis of the femur (Fig. 1). This radiographic measurement should be accurately performed and varies according to the hip rotation.
Is a femur bone?
The femur is your thigh bone. It’s the longest, strongest bone in your body. It’s a critical part of your ability to stand and move. Your femur also supports lots of important muscles, tendons, ligaments and parts of your circulatory system.
Do screws in bone hurt?
Painful Hardware is a possible side effect from metal screws and plates, which are often used in surgery to fix fractures, fuse joints, or stabilize bones.
Can you have an MRI after hip replacement?
Although some old MRI scanning equipment may not be compatible with your prosthesis, the majority of MRI scanning equipment today is safe and compatible with hip replacement parts. You also may have a CT scan of any part of your body after a hip replacement.
When do you start weight bearing after uncemented THR?
Some studies have proposed that the time of partial weight bearing (PWB) of patients with uncemented THA should last for 6 to 12 weeks [9, 10].
What are dorr Type A and Type B femurs?
The proximal femurs of the remaining 172 patients (mean age, 85 years) were categorised as Dorr type A (n=29), type B (n=75), and type C (n=68). The respective mean cortical thickness indices were 1.10, 0.79, and 0.65.
What are the different types of Dorr femur morphology?
The Dorr proximal femur morphology was classified into types A, B, and C. Results: 28 patients were excluded. The proximal femurs of the remaining 172 patients (mean age, 85 years) were categorised as Dorr type A (n=29), type B (n=75), and type C (n=68). The respective mean cortical thickness indices were 1.10, 0.79, and 0.65.
What type of stem is used in Dorr type a femur arthroplasty?
Femoral stem survivorship in Dorr type A femurs after total hip arthroplasty using a cementless tapered wedge stem: a matched comparative study with type B femurs. J Arthroplasty. 2019;34:527-533.
What is the Dorr classification system of femoral bone quality?
As with most orthopaedic classification systems, the Dorr classification system of femoral bone quality can be used for four main purposes in patients undergoing THA: clinical decision-making, communication among providers, determining to what degree the prognosis of reconstructions may depend on bone quality, and research.