Oda H et al. – As observed on MRI, the degree of osteoarthritis of the knee is bone bruise. The degree of hydrarthrosis is related to the grade of bone bruise, but is not linked to the degree of osteoarthritis (OA). Methods
Study to compare MRI findings with radiological findings in pts with knee pain and to identify factors that influence the progression of OA
161/212 pts were selected after exclusion of cases of trauma and other arthritides
MRI was used to evaluate the presence and degree of bone bruise, hydrarthrosis, and injuries to the cruciate ligament and meniscus
Bone bruise was classified into 4 types, and hydrarthrosis into 4 grades
Age was divided into 4 groups based on distribution quartiles
Results
Bone bruise was present in 87 cases, hydrarthrosis in 100, cruciate ligament injury in 20, and meniscus injury in 98
The presence of bone bruise was not related to age, cruciate ligament injury, meniscus injury, nor to OA of the patellofemoral joint
It was related to hydrarthrosis and to OA of the femorotibial joint
Femorotibial OA was much more strongly associated with bone bruise than with hydrarthrosis
There was a positive correlation between the grade of bone bruise and the amount of hydrarthrosis
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