• Felix Porschke, Marc Schnetzke, Christoph Luecke, Christel Weiss, Stefan Studier-Fischer, Paul Alfred Gruetzner, and Thorsten Guehring.
• BG Trauma Center Ludwigshafen at Heidelberg University Hospital, Ludwig-Guttmann-Straße 13, 67071, Ludwigshafen, Germany. felix.porschke@bgu-ludwigshafen.de.
• Arch Orthop Trauma Surg. 2022 Nov 1; 142 (11): 3395-3403.

IntroductionThe interval slide procedure (IS) has been introduced to improve mobility in massive, retracted rotator cuff tears. As clinical studies showed controversial results, the benefit of the IS is still widely discussed.AimAim of this study was to analyze the effect of IS procedure on tendon mobility in a fresh porcine cadaver model.Materials And MethodsIn 30 fresh porcine cadaver shoulders with artificial supraspinatus defect tendon mobility was tested by measuring the load (in N) during tendon reduction to the footprint at the greater tubercle using a sensor enhanced arthroscopic grasper (t1). In intervention group (N = 15) anterior IS (t2), posterior IS (t3) and intraarticular capsule release (t4) were successively performed, each followed by tendon mobility assessment. Tendon mobility of the control group (N = 15) was measured in same time schedule without intervention.ResultsMobility did not differ between groups for native tendons (CG 28.0 ± 11.2 N vs. IG 26.6 ± 11.6 N; P = 0.75). IS procedure significantly improves mobility at about 25.2% (t1 26.6 ± 11.6 N vs. t4 19.9 ± 12.3 N; P < 0.001) compared to the native tendon and 34.1% compared to CG (CG 30.2 ± 13.7 N vs. 19.9 ± 12.3 N; P = 0.026). In posthoc analyzes, anterior IS (P < 0.001) and capsule release (P = 0.005) significantly increased mobility, whereas the posterior IS did not (P = 0.778).ConclusionThe IS procedure results in increased supraspinatus tendon mobility in fresh porcine cadaver shoulders. However, performing the posterior IS subsequent to the anterior IS no significant improvement of mobility has been observed.© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

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