HSING-KUO WANGHONGSEN CHIANGWEN-SHIANG CHENTIFFANY TING-FANG SHIHHuang Y.-C.Jiang C.-C.2020-08-062020-08-0620130003-9993https://scholars.lib.ntu.edu.tw/handle/123456789/511198Objectives: To compare the neuromechanical and functional characteristics of the legs of athletes who underwent unilateral Achilles' tendon repair and their controls, and to determine any correlation between the characteristics. Design: A case-control and cross-sectional study. Setting: A university institute. Participants: Male athletes (N=33) were recruited; 23 in the ?3- and <12-month postsurgical group (median age, 29.8y; age range, 21.9-40.0y) and 10 in the control group (median age, 30.0y; age range, 21.1-39.5y) who had not undergone any surgery. Intervention: Surgical Achilles' tendon repair in the study group. Main Outcome Measures: Bilateral measurements of activation strategy involving the triceps surae and tibialis anterior muscles, mechanical properties of the Achilles' tendon, and explosive performance tests were conducted. Results: Compared with the noninjured legs and the control legs, the repaired legs showed lower normalized rates of electromyographic rise (RER) in the soleus, gastrocnemius medialis, and gastrocnemius lateralis (P ranged between.006 and.001); and less tendon stiffness, greater hysteresis, and less rates of force development (RFD) (P ranged between.006 and <.001). Repaired legs had less ankle dorsiflexion, a shorter 1-leg hopping distance, and lower balance scores (P?.001). The noninjured legs of the athletes who underwent surgical Achilles' tendon repair had a lower normalized RER (0-50ms) in the soleus and lateral gastrocnemius when compared with the legs of the healthy controls (P=.011). The neuromechanical outcomes and explosive performances showed correlations with RFD, 1-leg hopping distance, and balance score. Conclusions: The athletes who underwent unilateral Achilles' tendon repair demonstrated bilateral neuromechanical deficits within the 1-year postsurgical period. ? 2013 by the American Congress of Rehabilitation Medicine.[SDGs]SDG3achilles tendon; adult; article; athlete; case control study; clinical article; controlled study; cross-sectional study; gastrocnemius muscle; human; male; mechanics; muscle isometric contraction; neuromechanics; outcome assessment; performance; rigidity; skeletal muscle; tendon reconstruction; tibialis anterior muscle; triceps surae muscle; M(max); M(sup); maximal M wave; maximal voluntary isometric contraction; Mechanical phenomena; MVIC; Nervous system; Postural balance; rate of electromyographic rise; rate of force development; Rehabilitation; RER; RFD; RMS; root mean square; SEBT; Star Excursion Balance Test; supramaximal M wave; Tendons; Victorian Institute of Sports Assessment-Achilles questionnaire; VISA-A; Achilles Tendon; Adult; Athletic Injuries; Case-Control Studies; Cross-Sectional Studies; Electromyography; Humans; Male; Muscle Contraction; Muscle, Skeletal; Range of Motion, Articular; Recovery of Function; Rupture; Time Factors; Treatment Outcome; Young Adultjournal article10.1016/j.apmr.2013.01.015233803462-s2.0-84880921171