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Background:   The correlation between isokinetic internal and external rotation (IR and ER) strength and functional outcomes in patients with anterior shoulder instability treated by arthroscopic capsulolabral reconstruction (ACR) has not been studied.Purpose:   To analyze isokinetic IR and ER strength and their correlation with clinical outcomes in patients with anterior shoulder instability treated by ACR.Study Design:   Case series; Level of evidence, 4.Methods:   Between January 2004 and June 2015, a total of 104 patients who underwent ACR for anterior shoulder instability were analyzed. The mean peak torque (PT) in IR (IR PT ) and ER (ER PT ), PT deficit (PTD; %) relative to the opposite healthy shoulder, and PT ratio (PTR; ER PT /IR PT ) were calculated before and 1 year after surgery. Functional scores were evaluated before surgery and at every follow-up visit. Recurrence and postoperative apprehension during ER at 90° of arm abduction were evaluated at 1 year and the final follow-up (76.6 ± 64.4 months).Results:   IR and ER strength were measured for 68 of 104 patients at 1 year after surgery. ER PT  and IR PT  were less on the involved side than on the uninvolved side before surgery (0.29 ± 0.10 vs 0.33 ± 0.10 N·m/kg, respectively, for ER PT  [ P = .002]; 0.36 ± 0.14 vs 0.41 ± 0.16 N·m/kg, respectively; for IR PT  [ P = .01]). At 1 year after surgery, IR PT  on the involved side recovered (0.40 ± 0.20 N·m/kg), whereas ER PT  remained weak (0.30 ± 0.13 N·m/kg) relative to the baseline value. PTD in IR (PTD IR ) improved to 2.2% ± 24.4% ( P = .012), whereas PTD in ER (PTD ER ) showed no improvement (13.5% ± 13.8%; P = .569). PTR on the involved side improved from 1.07 ± 1.71 to 0.86 ± 0.23 at 1 year ( P &lt; .001). All functional scores improved significantly at the final follow-up. At 1 year, 9 of 68 (13.2%) patients showed positive apprehension. PTD IR  and PTD ER  on the involved side were worse in patients with positive apprehension than in those with negative apprehension ( P = .039 and .014, respectively). PTD ER  was worse than PTD IR  in patients with positive apprehension at 1 year ( P = .022).Conclusion:   For those with anterior shoulder instability, preoperative IR and ER strength of the involved shoulder were lower than those of the uninvolved shoulder. IR PT  recovered, whereas ER PT  remained weak after ACR. To prevent positive apprehension after surgery, IR and ER strengthening exercises are important, with more emphasis on exercises for ER.

Changes in Shoulder Rotator Strength After Arthroscopic Capsulolabral Reconstruction in Patients With Anterior Shoulder Instability