[The value of magnetic resonance imaging in the clinical course of osteochondrosis dissecans in the knee and ankle joints].
OBJECTIVE
Definition of the prognostic value of clinical and morphological findings in the mid-term follow-up of OCD of the femoral condyle and talus. Demonstration of the consolidation of OCD on MRI depending on different therapies.


METHODS
76 patients were examined before and at an average of 30 months after conservative or surgical therapy using T1 and T2 weighted SE and 3D-FISP sequences and contrast enhanced studies. Six clinical (age, gender, site, duration and severity of symptoms, therapy) and six morphological (size, signal intensity, fragmentation, contrast enhancement, condition of cartilage, staging) data were registered on first MRI and correlated with the degree of consolidation of OCD (partial and complete remission, no change and progression) on control MRI.


RESULTS
Patients under 17 years showed partial or complete remissions in 73%, those of 17 years or older in 33%. Conservatively treated patients had a higher remission rate (54%) than those treated with different surgical techniques (drilling 50%, refixation 43%, abrasio 38%). Small OCDs had a higher remission rate than large lesions (63% vs. 33%). OCDs covered with intact cartilage healed better than lesions with chondral defects (61% vs. 26%). Contrast enhancing fragments had a better prognosis than non-enhancing lesions (100% vs. 40%).


CONCLUSIONS
Prognosis of OCD can be better estimated when size of OCD, condition of cartilage and enhancement of contrast agent is graduated with MRI and patient age is registered. The consequences for therapy planning are great.
Bachmann
G
G
Abteilung Diagnostische Radiologie, Klinikum der Justus-Liebig-Universität, Giessen. Georg.bachmann@radiol.med.uni-giessen.de
Jürgensen
I
I
Rominger
M
M
Rau
W S
WS
D000843:Ankle Joint / Q000473:pathology*; D018450:Disease Progression; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D010008:Osteochondritis Dissecans / Q000175:diagnosis* / Q000601:surgery; D011379:Prognosis; D012307:Risk Factors; D013628:Talus / Q000473:pathology; D016896:Treatment Outcome