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pericollapse Stage of Osteonecrosis of the Femoral Head： A Last Chance for Joint Preservation

Chinese Medical Journal 2018年第21期131卷 2589-2598页

作者： Qing-Yu Zhang Zi-Rong Li Fu-Qiang Gao Wei Sun Department of Orthopaedic Graduate School of Peking Union Medical College China-Japan Friendship Hospital Institute of Clinical Medicine Beijing 100029 China Department of Orthopaedic Centre for Osteonecrosis and Joint-Preserving and Reconstruction China-Japan Friendship Hospital Beijing 100029 China Department of Orthopaedic Peking University China-Japan Friendship School of Clinical Medicine Beijing 100029 China

Objective： To propose a new definition of the pericollapse stage of osteonecrosis of the femoral head （ONFH） and review its significance in disease diagnosis and treatment selection. Data Sources： A search for eligible studies was conducted in three electronic databases including PubMed, Cochrane Library, and Embase up to August 10, 2018, using the following keywords：＂osteonecrosis＂, ＂prognosis＂, and ＂treatment＂. Study Selection： Investigations appraising the clinical signs, symptoms, and imaging manifestations in different stages of ONFH were included. Articles evaluating the prognosis of various joint-preserving procedures were also reviewed. Results： The pericollapse stage refers to a continuous period in the development of ONFH from the occurrence of subchondral fracture to early collapse （〈2 mm）, possessing specific imaging features that mainly consist of bone marrow edema and joint effusion on magnetic resonance imaging （MR1）, crescent signs on X-ray films, and clinical manifestations such as the sudden worsening of hip pain. Accumulating evidence has indicated that these findings may be secondary to the changes after subchondral fractures. Of note. computed tomography provides more information for identifying possible subchondral fractures than does MRI and serves as the most sensitive tool for grading the pericollapse lesion stage. The pericollapse stage may indicate a high possibility of progressive disease but also demonstrates satisfactory long- and medium-term outcomes fbr joint-preserving techniques. In tact, if the articular surface subsides more than 2 mm, total hip arthroplasty is preferable. Conclusions： The pericollapse stage with distinct clinical and imaging characteristics provides a last good opportunity for the use of joint-preserving techniques. It is necessary to separate the pericollapse stage as an independent state in evaluating the natural progression of ONFH and selecting an appropriate treatment regimen.

关键词： Joint-Preserving Procedure Osteonecrosis of the Femoral Head pericollapse Prognosis

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