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Perceived vs. true glenoid anchor placement: a cadaveric comparison of the beach chair and lateral position.


ABSTRACT:

Purpose

To explore whether patient position influences a surgeon's ability to accurately judge anchor position on the glenoid.

Materials and methods

Two anchors were inserted into the glenoid of 8 shoulders. Arthroscopic videos were taken from 3 views (posterior beach chair [pBC], posterior lateral decubitus [pLD], and anterosuperolateral decubitus [asLD]). The shoulders were disarticulated to identify "true" anchor position. Seventeen shoulder surgeons reviewed the videos and indicated anchor positions using the "clock face" method. Accuracy was measured within tolerances, ranging from zero (exact), 0.5 (half-hour), 1.0, and 1.5 hours of "true" position. Intra- and inter-rater agreement was calculated. Post hoc analyses explored for bias dependent on surgical side.

Results

The overall accuracy was 34.0%. At tolerances of 0.5, 1.0, and 1.5 hours, accuracy increased to 82.4%, 95.4%, and 98.0%. With a 30° scope, identification of exact position was more accurate in pBC than pLD (odds ratio [OR] = 1.397; P = .029) but not asLD (OR =1.341; P = .197). At a tolerance of 0.5 hour, the 30° scope was more accurate in pBC than both pLD (OR = 1.444; P = .011) and asLD (OR = 1.728; P = .009). In left shoulders, anchors were perceived as more inferior than true position in asLD and pLD. In right shoulders, anchors were perceived as more superior than true position from pBC and pLD. Inter- and intrarater agreement were highest in pBC with a 30° scope (30° scope weighted kappa = 0.783 and 70° scope weighted kappa = 0.853, respectively).

Conclusion

Judgment of anchor position on video is most accurate in a pBC view. Inter- and intrarater reliability were also highest from a pBC view.

SUBMITTER: Jong BY 

PROVIDER: S-EPMC7846687 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Publications

Perceived vs. true glenoid anchor placement: a cadaveric comparison of the beach chair and lateral position.

Jong Benjamin Y BY   MacDonald Peter B PB   Regan William D WD   Leiter Jeff R JR   Sayre Eric C EC   Sasyniuk Treny M TM   Goel Danny P DP  

JSES international 20201124 1


<h4>Purpose</h4>To explore whether patient position influences a surgeon's ability to accurately judge anchor position on the glenoid.<h4>Materials and methods</h4>Two anchors were inserted into the glenoid of 8 shoulders. Arthroscopic videos were taken from 3 views (posterior beach chair [pBC], posterior lateral decubitus [pLD], and anterosuperolateral decubitus [asLD]). The shoulders were disarticulated to identify "true" anchor position. Seventeen shoulder surgeons reviewed the videos and ind  ...[more]

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