27.03.2024 | Originalarbeit
Are bursal-sided supraspinatus tendon lesions caused by subacromial impingement?
A radiological matched-pair analysis
verfasst von:
Sebastian Fromm, Dr. med. Sven Lichtenberg, MD, Prof. Dr. med. Markus Loew, MD PhD, Prof. Dr. med. Peter Habermeyer, MD PhD, Prof. Dr. med. Marc Schnetzke, MD PhD
Erschienen in:
Obere Extremität
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Abstract
Background
Mechanical outlet impingement is believed to be a significant factor in the pathogenesis of bursal-sided supraspinatus (SSP) tendon partial tear, a rare and poorly described entity. This relationship has not yet been confirmed.
Objective
We compared the radiological impingement parameters between complete, isolated SSP tears and bursal-sided SSP tears. The study hypothesis was that the impingement parameters in the bursal-sided SSP tear group would be significantly more pronounced.
Materials and methods
In total, 43 patients with bursal-sided SSP tendon partial tear (group 1; n = 43) and 43 patients with complete, isolated SSP tendon tear (group 2; n = 43) were included and matched for age (groups 1 and 2: 58 ± 9 years) and gender (70% male and 30% female patients). Standardized preoperative radiographs (anteroposterior; outlet view) were compared for radiological impingement parameters: critical shoulder angle (CSA), lateral acromial angle (LAA), acromiohumeral index (AHI), acromiohumeral distance (AHD), acromion type according to Bigliani (ATB).
Results
Radiological parameters did not differ significantly between groups: CSA: 36° ± 4° (group 1) and 36° ± 4° (group 2); LAA: 79° ± 6° vs. 80° ± 8°; AHD: 11 mm ± 2 mm vs. 10 mm ± 2 mm. The AHI was 0.7 ± 0.1 for both groups. Furthermore, ATB II was most common in both groups (group 1 = 74%; group 2 = 63%), followed by ATB I (group 1 = 14%; group 2 = 23%) and ATB III (group 1 = 12%; group 2 = 14%; p = 0.443).
Conclusion
We found no difference in radiological impingement parameters between bursal-sided and complete SSP tears and therefore reject the study hypothesis. Mechanical outlet impingement does not seem to play a greater role in the development of bursal-sided lesions compared to complete SSP lesions.