MORPHOLOGY AND HISTOLOGY OF THE COLLAPSED LUNATE IN ADVANCED KIENBÖCK DISEASE

Author:

Ueba Yasuo1,Kakinoki Ryosuke1,Nakajima Yasuaki2,Kotoura Yosihiko1

Affiliation:

1. Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan

2. Department of Pathology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan

Abstract

Morphological and histological changes of 24 collapsed lunates in advanced Kienböck disease were investigated. Articular cartilage of a collapsed lunate were consistently attenuated or disappeared. The proximal articular cartilage facing the radius is generally more affected than the distal articular cartilage facing the capitate. There was one major fracture in addition to multiple minor fractures in the collapsed lunate. Fracture patterns were classified into three types according to the directions of major fracture, namely horizontal type, dual oblique type, and vertical type. There were viable and necrotic areas in the collapsed lunate. Active new bone formation was observed at the junction between the viable and necrotic bone area of the collapsed lunate in advanced Kienböck disease.

Publisher

World Scientific Pub Co Pte Lt

Subject

General Medicine

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