Zusammenfassung
Zielstellung
Anliegen der Arbeit war es, die Validität der präoperativen klinischen Untersuchung, der radiologischen Befunde und der MRT bei der Diagnostik chondraler Schäden des Kniegelenks im Vergleich zur Arthroskopie zu bestimmen.
Methode
Bei 721 Patienten mit Kniebeschwerden die 3 Monate oder länger andauerten, erfolgte die standardisierte klinische Diagnostik (Grinding-Test), die radiologische Standarddiagnostik (Standaufnahmen und Patella-Axial-Aufnahme) sowie die MRT-Untersuchung (T1- und T2-Wichtung). Alle Patienten wurden nachfolgend arthroskopiert. Mithilfe des Tasthakentests wurde die Schwere des Knorpelschadens nach der ICRS- (International-Cartilage-Repair-Society-)Klassifikation bestimmt. Abschließend wurden die Ergebnisse der präoperativen Diagnostik mit den arthroskopischen Befunden verglichen.
Ergebnisse
Der Grinding-Test hatte eine durchschnittliche Empfindlichkeit von 0,39 mit einer signifikanten höheren Häufigkeit bei tiefer gehender Knorpelschädigung (p<0,000). Bei 97,4% der Gelenkflächen ohne Knorpelpathologie war der radiologische Befund unauffällig. Subchondrale Sklerose und Exophyten kamen signifikant häufiger bei höhergradigen Knorpelschäden vor (p<0,000). Nur in 59,5% der Fälle wurden übereinstimmende Befunde zwischen MRT und Arthroskopie erhoben. Bei 36,6% wurden die Knorpelschäden im MRT überbewertet, bei 3,9% wurde der Knorpelschaden im MRT zu niedrig eingestuft. Überbewertungen kamen signifikant häufiger bei intaktem und niedriggradig geschädigtem Knorpel vor (p<0,000).
Schlussfolgerung
Klinische, radiologische und kernspintomographische Untersuchung stehen bei höhergradigen Knorpelschäden in relativ guter Korrelation mit den arthroskopischen Befunden, während bei intaktem Knorpel oder initialer Chondropathie falsch-positive Ergebnisse häufig sind.
Abstract
Background
The study was aimed to evaluate the validity of clinical, radiological and MRI examination for cartilage defects of the knee compared with arthroscopic finding.
Methods
Sevenhundred-seventy-two patients who were suffering from knee pain over more than 3 months were evaluated clinical (grinding-sign) and with radiography and magnetic resonance imaging (MRI) and subsequent arthroscopy.
Results
The grinding sign had a sensitivity of 0.39. The association of a positive grinding test with high grade cartilage defects was significant (p<0.000). In 97.4% an intact chondral surface correlated with a normal radiological finding. Subchondral sclerosis, exophytes and a joint space narrowing was significantly associated with high grade cartilage defects (p<0.000). The accuracy of MRI was 59.5%. The MRI resulted in an overestimation in 36.6% and an underestimation in 3.9%. False-positive results were significant more often assessed in low-grade cartilage defects (p<0.000).
Conclusions
Clinical signs, x-ray imaging and MRI correlate with arthroscopic findings in cases of deep cartilage lesions. In intact or low-grade degenerated cartilage often results an overestimating of these findings.
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Danksagung
Herrn Dr. Fischer, radiologische Gemeinschaftspraxis Eisenach, danken wird für die Überlassung der MRT-Bilder
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Spahn, G., Wittig, R., Kahl, E. et al. Diagnostik von Knorpelschäden des Kniegelenks. Unfallchirurg 110, 414–424 (2007). https://doi.org/10.1007/s00113-006-1225-z
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DOI: https://doi.org/10.1007/s00113-006-1225-z