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A 70° Arthroscope Significantly Improves Visualization of the Bicipital Groove in the Lateral Decubitus Position

      Purpose

      The purpose of this study was to quantify the length of the bicipital groove viewable with a 70° arthroscope and to compare this distance visualized with use of a 30° arthroscope in both cadavers and living subjects.

      Methods

      Diagnostic glenohumeral arthroscopy in the lateral decubitus position was performed on 10 fresh-frozen cadaveric shoulders from a posterior portal. Using 70° and 30° arthroscopes, the distalmost viewable portion of the bicipital groove was percutaneously marked. Dissection of each specimen was then performed, and the distances between the articular margins of the humeral head to each marked portion of bicipital groove were recorded. Subsequently, a similar technique was used to measure the visible length of the bicipital groove in a series of 11 patients at the time of diagnostic glenohumeral arthroscopy performed in the lateral decubitus position using 70° and 30° arthroscopes. Descriptive statistics were used for continuous data. Means were compared with a Mann-Whitney test. Statistical significance was set at P ≤ .05.

      Results

      The cadaveric analysis revealed a significant increase in the amount of bicipital groove visualized with the 70° arthroscope versus that visualized with the 30° arthroscope (18.0 ± 6.9 mm v 11 ± 4.7 mm, P = .01). In similar fashion, the results of the in vivo analysis showed that the 70° arthroscope allowed for significantly more visualization of the bicipital groove than the 30° arthroscope (26.3 ± 6.2 mm v 14 ± 4.7 mm, P = .025).

      Conclusions

      The use of a 70° arthroscope significantly increases the length of bicipital groove visualized during glenohumeral arthroscopy in the lateral decubitus position compared with that of the 30° arthroscope in both cadavers and living subjects.

      Clinical Relevance

      Routine use of a 70° arthroscope significantly improves visualization of the bicipital groove and all relevant intra-articular structures compared with that of a 30° arthroscope during diagnostic glenohumeral arthroscopy performed in the lateral decubitus position.
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