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Tribology and Total Hip Arthroplasty Implants
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Define tribology and discuss its effect on total hip arthroplasty (THA).
Tribology is defined as the science of interacting surfaces in relative motion and includes the principles of friction, lubrication, and wear of implant materials. Tribology of the articulating materials in THA is the most important issue for long-term survival of the implants because the fixation of implants either with or without cement has reached excellent long-term survival rates up to 20 years. Because the long-term success of an implant is based on permanent fixation and wear of the articulation, concerns about wear and osteolysis have highlighted the importance of tribology in THA.…
Types of X-Rays or Imaging the Hip
Patients are placed in standardized positions or “views” which were developed to facilitate quick recognition of normal versus abnormal bone structure. In the case of radiographs of the hip, the most frequently used views are:
- Anteroposterior (AP) hip
- Lateral (“frog-leg”)
- AP Pelvis, including upper femora (bilateral)
Radiographs are commonly used to evaluate hip fractures, bone lesions or arthritis. They are also the initial imaging modality of choice for evaluating a patient with hip pain, or evaluating a patient following trauma. Other imaging techniques which may be used for supplemental information include:
- CT- can be helpful for complex fractures and dislocations;
- MRI- is now the modality of choice for identifying occult fractures, hip pain of unknown etiology, infection, tumor and osteonecrosis;
- Bone scans- can be used to identify subtle fractures or avascular necrosis when MRI is not readily available;
- Arthrography– evaluates joint anatomy,
Correcting uneven limbs after hip replacement
Read full article here: http://abclocal.go.com/wls/story?section=news/health&id=9407082
January 25, 2014
It’s one of the most troublesome and yet little known problems that occur after total hip replacement: Thousands of patients left with one leg longer than the other…
… More than 300,000 hip replacement surgeries are performed each year, and by 2030 that number is expected to nearly double. But as those numbers grow, so do the chances of complications, like one leg being longer or shorter than the other. Imagine a one-and-a-half inch difference in limbs…
… Studies show leg length inequalities are a preventable mistake that account for nearly 5 percent of all medical errors. "It’s a growing problem and a growing surgical procedure," said Dr. Henry Finn, University of Chicago, Weiss Memorial Hospital. Hip revisionist Doctor Finn says about a third of hip replacement patients will have an obvious difference in lengths, which …
Does Smoking Affect Implant Survivorship in Total Hip Arthroplasty? 2005
Russell D Meldrum, MD, L Daniel Wurtz, MD, Judy R Feinberg, PhD, and William N Capello, MD
…In summary, in this series of 147 patients (165 hips) followed an average 13 years after total hip arthroplasty, there was a significantly greater rate of component revision for aseptic loosening in patients who smoked at the time of THA and who continued to smoke for years afterward. Further study is needed to determine the extent to which smoking contributes to aseptic loosening in relationship to other known contributing factors, and whether there is a smoking dose relationship.…
Total Hip Replacement with Stryker’s Mobile Bearing Hip
A Moveable Feat – Anatomic Dual Mobility
Typical fixed hip replacement components include a stem that inserts into the femur, a ball that replaces the head of the femur or top of the thigh bone, and a shell that lines the hip socket (acetabulum). An innovation in hip replacement design, the Mobile Bearing Hip Replacement only from Stryker features a unique polyethylene insert made with X3 Advanced Bearing Technology that is designed to fit snugly within the metal shell and over the ball to secure and buffer the joint. It’s called anatomic dual mobility or ADM. The insert allows both hip components to glide smoothly without the stem making contact with the shell. The Mobile Bearing Hip’s design allows your doctor to more closely match the implant to your anatomy and provides you with several potential advantages.…
Sex hormones predict joint replacement medical study 2014
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April 2014 by Monash University and Alfred hospital
Women who have knee and hip replacements due to osteoarthritis (OA) have different patterns of sex hormone concentrations compared with the general population, according to Melbourne researchers.
Their prospective study of a cohort of over 2,600 middle-aged women with ten-year follow-up found that higher oestradiol concentrations reduced the risk of total knee replacement by about a third.
The finding was consistent with a previous study showing women using long-term postmenopausal oestrogen therapy had greater knee cartilage volume than non-users……
Sexual function after a total hip replacement
Will I be able to resume sexual relations now that my hip has been replace?
Most patients are able to resume safe and enjoyable intercourse after hip replacement. The hip pain and stiffness that was noted before surgery will disappear, and you will find your hip to be pain-free and have better motion. However, it may take several weeks before you are comfortable with you new hip. …
Short Stem THRs Successfully Used in Elderly Patients Medical Study 2014
Kwang-Jun Oh, MD, PhD; Amit Mishra, MD; Jae-Hyuk Yang, MD, PhD
Concerns exist regarding using short stems during total hip arthroplasties performed in elderly patients. For this study, the authors assessed sequential bone remodeling findings in metaphyseal-loading short stems using serial radiography. A total of 100 consecutive primary THAs using short stems were performed in patients with an average age of 78.3 years…
…The radiographic findings of metaphyseal-loading short stems in elderly patients suggest that 91.3% of implants were osseointegrated. No patient required stem revision. Metaphyseal-loading short stems in elderly patients provide continued fixation with adaptive bone remodeling.