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Open versus arthroscopic decompression for subacromial impingement. A comprehensive review of the literature from the last 25 years.

Authors: Checroun AJ, Dennis MG, Zuckerman JD.

References: Bull Hosp Jt Dis. 1998;57(3):145-51.

Abstract
The operative management (open versus arthroscopic) of subacromial impingement was investigated through a search of the English-language literature from 1970 to 1996. Thirty-four clinical studies comprising 1,935 patients met the following selection criteria: a study published in a peer reviewed journal, a valid materials and methods section (describing age, gender, number of subjects, follow-up period, treatment modality, and impingement stage), and acromioplasty without rotator cuff repair. Six hundred and ninety-eight patients had an open decompression (OD) and 1,237 had an arthroscopic subacromial decompression (ASD) for Stage II and III impingement. When possible, only Stage II patients were reviewed. A few studies combined Stage II and III patients in their results; thus, the patients were placed into two groups (OD and ASD) composed of four categories: OD of Stage II impingement (494 patients), OD of Stage II and III impingement (204 patients), ASD of Stage II impingement (727 patients), and ASD of Stage II and III impingement (510 patients). The average duration of symptoms before surgery ranged from 6 months to 43 months in the OD group and 6 months to 61 months in the ASD group. The average age was 41.8 and 42.1 years, clinical follow-up 6 months to 62 months and 12 months to 41 months in the OD and ASD groups, respectively. The objective success rates were 83.3% versus 81.4% and the subjective success rates were 90.0% versus 89.3% for OD versus ASD, respectively. Return to work ranged from 43% to 100% in the OD group and 74% to 100% in the ASD group. Based on our review, the outcome from ASD is similar to OD. For persistent stage II primary impingement, we recommend starting with ASD and reserve OD for surgical failures. ASD allows earlier rehabilitation than OD because complete detachment of the deltoid is not performed, yet ASD is technically more demanding and has a long learning curve.

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