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In a prediction rule study, investigators identify a consecutive group of patients who are suspected of having a specific disease or outcome. The investigators then obtain a standard set of clinical observations on each patient and a test or clinical follow-up to define the true state of the patient.
The Ottawa knee rules are a set of rules used to help physicians determine whether an x-ray of the knee is needed. [1] They state that an X-ray is required only in patients who have an acute knee injury with one or more of the following: Age 55 years or older; Tenderness at head of fibula; Isolated tenderness of patella
A blood test could help predict knee osteoarthritis at least eight years before the signs of the disease show up on X-rays, a new study indicates. Blood test may be able to detect osteoarthritis 8 ...
An elevated D-dimer in the elderly population has no predictive value for deep venous thrombosis. Signs and symptoms of DVT in general are not sufficiently sensitive or specific to make a diagnosis, being helpful only to help determine the likelihood of a DVT (with the use of a clinical prediction rule such as the Wells score). [5]
Diagnosis of knee osteoarthritis often entails a physical examination, assessment of symptoms and the patient's medical history, but may also involve medical imaging and blood tests. [1] Persistent knee pain, limited morning stiffness and reduced function, crepitus, restricted movement, and bony enlargement appear to be the most useful ...
However, from a practical point of view, false positives that lead to negative X-ray tests were the very thing that the knee rules are trying to address. Nonetheless, the Pittsburgh knee rules offer fewer false positives than do the Ottawa knee rules , though the Ottawa knee rules are more commonly used. [ 2 ]
The questions on the WOMAC are a subset of the questions of the Hip disability and osteoarthritis outcome score (HOOS). [4] Thus, a HOOS survey may also be used to determine a WOMAC score. A WOMAC test takes about 12 minutes, but is also available in a short form, (although this has not been as extensively tested as the full version).
In the temporomandibular joint, subchondral sclerosis of the mandibular condyle has been described as an early change, condylar flattening as a feature of progressive osteoarthritis, and narrowing of the temporomandibular joint space as a late stage change. [14] A joint space of between 1.5 and 4 mm is regarded as normal. [15] Ankle osteoarthritis.