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Femoroacetabular impingement is an important entity with well-described radiographic findings. One of the criteria of the cam type of femoroacetabular impingement is femoral head-neck dysplasia, denoted mathematically as the "alpha angle." Several observers have reported that direct measurement of the angle may not be necessary because subjective appraisal may yield...

The extensor mechanism of the knee consists of the quadriceps muscle group, quadriceps tendon, patella, patellar retinaculum, patellar ligament, and adjacent soft tissues. Injuries to the extensor mechanism are common and consist of chronic degenerative injuries, overuse injuries, and acute trauma.
Timothy J Mosher, MD Updated: Dec 16, 2008

CONCLUSION: Cartilage delamination is common in patients undergoing surgery for FAI. Fluid under the cartilage delamination is a specific but rare finding. Hypointense areas in the acetabular cartilage seen on intermediate-weighted fat-saturated or T1-weighted images appear to be helpful diagnostic criteria.
MR arthrography of acetabular cartilage delamination in femoroacetabular cam impingement. Pfirrmann...

Archive copy. Last posted 2008
Disorders Amenable to MRI
Congenital
Infection
Tumors and tumor-like conditions
Trauma
Marrow disorders
Synovial disorders
Miscellaneous

Magnetic resonance imaging (MRI) of the spine is currently one of the most frequently requested MR examinations. The demand for this exam will probably increase with the advancing age of the patient population coupled with the prevalence of degenerative spine disease and lower back pain. There is a great need,...

This is an interactive Powerpoint presentation intended for Radiology, Orthopedic Surgery, and Physical Medicine and Rehabilitation residents to learn imaging of the shoulder with emphasis on MRI. At various points in the presentation the reader is directed to available online resources using hyperlinks which will aid in self-learning. The common...

Rotator cuff and Subacromial Bursa pathology were the most common findings on ultrasound and MR Arthrography. Evidence of a full thickness supraspinatus tear was associated with symptoms arising from the subacromial region, and a biceps tendon sheath effusion and an intact rotator cuff were associated with an intra-articular Glen0-humeral joint...

Conclusion: The clinical diagnosis had a poor association with radiologic abnormalities. Despite an increase in the number of MRI and CT scans, the number of patients deemed surgical candidates has not changed.
Effect of increased MRI and CT scan utilization on clinical decision-making in patients referred to a surgical clinic for back pain
Adrienne...

MRI - Arthroscopic Correlations in the Upper Extremity By: Laith Jazrawi

plain film:
* narrowing of disc space; osteophytes; bone sclerosis
* disc calcification
* vacuum disc phenomenon (nitrogen at sites of negative pressure)
MRI: endplate changes (Modic & deRoos)
* Type I (4%): decreased signal on T1; increased signal...

This is a series of radiology cases from Dr. Hunter's experiences at University of Washington and Harborview Medical Centers in Seattle, Washington and from Stanford University. Text and images copyright John Hunter, MD.
180 cases

This is a series of radiology cases from Dr. Hunter's experiences at University of Washington and Harborview Medical Centers in Seattle, Washington and from Stanford University. Text and images copyright John Hunter, MD.
132 cases

Notes on the theory and practical issues of MRI
Advantages of MRI
Superior soft tissue contrast
Assess physiology as well as anatomy
Lack of ionizing radiation
Multiplanar capabilities

ACR-code 451-3182 2 cases
Clinical presentation: 22 year old female with pain in the left knee. There is a destructive bone lesion in the distal metaphysis and lateral condyle of the left femur. It extends to the joint surface and has eroded the cortex and extends laterally with a soft tissue bulge...

* most common in young girls
o (genu valgum, patella alta, quad mm deficiency more in girls)
* LATERAL dislocation
* spontaneous reduction
* recurrent dislocation
* fracture associated in 5-10%
* MRI: bone bruise of lateral femur and medial patella