2019 ISAKOS Biennial Congress ePoster #2010
Acromial Thickness Decreases After Arthroscopic Rotator Cuff Repair Regardless of Knot Use
Yukitaka Fujisawa, MD, PhD, Takatsuki, Osaka JAPAN
Teruhisa Mihata, MD, PhD, Takatsuki, Osaka JAPAN
Akihiko Hasegawa, MD, PhD, Takatsuki, Osaka JAPAN
Takeshi Kawakami, MD, PhD, Takatsuki, Osaka JAPAN
Kunimoto Fukunishi, MD, Takatsuki, Osaka JAPAN
Yaenosato Hospital, Higashi-Osaka, Osaka, JAPAN
FDA Status Cleared
Acromial thickness decreased significantly in the year after ARCR with ASD compared with just after surgery as well as before surgery regardless of knot use.
There are some reports that acromiohumeral interval (AHI) influences clinical outcome after arthroscopic rotator cuff repair (ARCR), but there is few report that investigated morphologic change of acromion after ARCR. We assessed acromial thickness over time after ARCR.
Materials And Methods
From 2013 to 2016, ninety-six patients at our institution underwent ARCR with arthroscopic subacromial decompression (ASD). Of these, we followed-up 27 (male 9; female 18; average age 68.9 years) over 1 year and classified them into two groups: knot-use ARCR (17) and knotless ARCR (10). MRI revealed no rotator cuff re-tear after surgery. We measured acromial thickness on radiographic scapular Y views before surgery, just after surgery, and 1 year after surgery and compared the results (Tukey’s test; P < 0.05). We also compared acromial thickness between the knot-use and knotlessgroups (t-test; P < 0.05).
Before ASD with ARCR, acromial thickness averaged 9.9 mm (7.7–12.6 mm). Just after surgery, acromial thickness had decreased significantly to 8.5 mm (5.0–11.2 mm) (P = 0.0001). One year after surgery, acromial thickness had again decreased significantly to 7.9 mm (5.5–11.7 mm) (P = 0.003); there was a 0.4-mm decrease in acromial thickness in the knot group and a 0.8-mm decrease in the knotless group compared with just after surgery; the between-group difference was not significant (P = 0.24).
Acromial thickness decreased significantly in the year after ARCR with ASD compared with just after surgery as well as before surgery. This decrease was unrelated to whether or not knots were used. We speculate that the inferior acromial surface, where cancellous bone was exposed, was worn away in adapting to the form of the repaired rotator cuff.