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Osteochondritis dissecans

Osteochondritis dissecans is when a loose piece of bone and cartilage separates from the end of the bone because of a loss of blood supply and insuffecient amounts of calcium. The loose piece may stay in place or slide around making the joint stiff and unstable. Osteochondritis Dissecans most commonly effects the knees or ankles. If a serious injury occurs in this area, the bone around it will supply it with as much calcium as possible to try and fix the loose piece of bone. This often results in a calcium build up around the loose piece. This build up is surgically removed most of the time. more...

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This is a minor disease, however it is very rare. It commonly occurs in boys and young men from 10-20 years of age while they are still growing. As girls become more active in sports, it is becoming more common among them as well.

Diagnosis

To determine whether your pains are Osteochondritis Dissecans, you can have an MRI to show whether the loose piece of bone is still in place. In specific cases if caught early enough, a harmless dye will be injected into your blood stream to show where the calcium will most likely continue to build up. Doing this makes the removal process much easier.

Read more at Wikipedia.org


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A comparison of arthroscopic and MRI findings in in osteochondritis dissecans of the talus
From Journal of Bone and Joint Surgery, 1/1/03 by Emms, N W

Introduction

Osteochondritis dissecans (OCD) is a localised disorder of subchondral hone and the overlying articular cartilage. The most commonly used classification systems involve arthroscopy and MRI.

Aim

To investigate the correlation between arthroscopic and MR findings in patients with OCD of the talus.

Methods

16 ankles in 14 patients with radiographically proven OCD were reviewed. Nine were male and five female. Mean age was 35yrs (range 18-64yrs). The lesions were staged independently using the Guhl1 arthroscopic and Dipaola2 MR classification systems.

Results

Arthroscopically there were eight stable and eight unstable lesions. Of the eight stable lesions. MRI staged five as stable and three as unstable. Of the eight unstable lesions. MRI staged six as unstable and two as stable. This gives a sensitivity of diagnosing unstable lesions as 0.75, with a specificity of 0.63.

Conclusions

This small study demonstrates that MR scans may have some limitations in classifying OCD lesions of the talus. Possible explanations are discussed. We propose that MRI findings, of OCD of the talus, should not be taken in isolation, but correlated with the patients symptoms and signs to avoid unnecessary arthroscopy.

(1) Guhl JF. Arthroscopic treatment of osteochondritis dissecans. Clin Orthop (167)65-74, 1982

(2) DiPaola J, Nelson DW, Colville M. Characterising osteochondral lesions by magnetic resonance imaging. Arthroscopy (7)101-4, 1991

N W Emms, S J Scott, HPJ Walsh, B Eyes.

Aintree University Hospital, Lower Lane, Liverpool L9 7AL. wiksy@aol.com

Copyright British Editorial Society of Bone & Joint Surgery 2003
Provided by ProQuest Information and Learning Company. All rights Reserved

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