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Erschienen in:
01.12.2012 | Knee
Evaluation of the prevalence, lesion, and depth of osteoarthritic changes in the patella
Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 12/2012
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Purpose
The aim of this study was to determine the prevalence, type of lesion, and depth of osteoarthritic (OA) changes in the patella.
Methods
One hundred and forty-six cadaveric knees were included in this study with an median age of 83 years (54–97). Patella OA lesion was classified using Han’s method: Type 1, no or minimal lesion; Type 2, medial facet lesion without involvement of the ridge; Type 3, lateral facet lesion without involvement of the ridge; Type 4, lesion involvement of the ridge; Type 5, medial facet lesion with involvement of the ridge, Type 6, lateral facet lesion with involvement of the ridge; and Type 7, Global lesion. The depth of OA evaluation was performed following Outerbridge’s classification.
Results
OA lesions were observed as follows: (Type 1) 31%, (Type 2) 16%, (Type 3) 3%, (Type 4) 12%, (Type 5) 22%, (Type 6) 2%, and (Type 7) 14%. Outerbridge’s classification of over Grade 2 OA depth was observed in 63.7% of subjects. A significant difference of patella OA type in gender was observed. Severe patella OA occurred in female subjects. Greater depth of OA was observed in Types 5 and 7. Most OA occurred in the medial facet of the patella including the ridge. Isolated OA in the lateral facet of the patella was observed in only 2% of all knees.
Conclusion
There is a risk of patella OA in female subjects. Patella OA occurred mainly on the medial side. Isolated OA in the lateral facet of the patella was rare. 63.7% of subjects had patella OA.
Level of evidence
Controlled laboratory study, Level III.