Bone bruise in acute traumatic patellar dislocation: volumetric magnetic resonance imaging analysis with follow-up mean of 12months

• Published in: Skeletal radiology 2010-07, Vol.39 (7), p.675-682
• Main Authors: Paakkala, Antti, Sillanpaeae, Petri, Huhtala, Heini, Paakkala, Timo, Maeenpaeae, Heikki
• Format: Article
• Language: English
• ISSN: 0364-2348; 1432-2161
• DOI: 10.1007/s00256-009-0858-8

Objective: The aim of the study was to assess volumetric analysis of bone bruises in acute primary traumatic patellar dislocation by magnetic resonance imaging (MRI) and resolving resolution of bruises in follow-up MRI. Materials and methods: MRI was performed in 23 cases. A follow-up examination was done at a mean of 12months after dislocation. Volumes of patellar and femur bruises for every patient were evaluated separately by two musculoskeletal radiologists, and mean values of the bruises were assessed. Other MRI findings were evaluated, together with agreement by consensus. Bone bruise volumes were compared with other MR findings. Results: In the acute study 100% of patients showed bruising of the lateral femoral condyle and 96% bruising of the patella. The bruise was located at the medial femoral condyle in 30% and at the patellar median ridge in 74% of patients. The median volume of the femoral bruise was 25,831mm super(3) and of the patellar bruise 2,832mm super(3). At the follow-up study 22% of patients showed bruising of the lateral femoral condyle and 39% bruising of the patella, the median volumes of the bruises being 5,062mm super(3) and 1,380mm super(3), respectively. Larger patellar bruise volume correlated with larger femur bruise volume in the acute (r=0.389, P=0.074) and the follow-up (r=1.000, P