Otzel Dana M, Chow John W, Tillman Mark D
Study Conducted at Biomechanics Laboratory, University of Florida, 151 Florida Gym, Gainesville, FL 32611, USA; Geriatric Research Education and Clinical Centers, Malcom Randall VA Medical Center, 1601 SW Archer Rd, Gainesville, FL 32608, USA.
Study Conducted at Biomechanics Laboratory, University of Florida, 151 Florida Gym, Gainesville, FL 32611, USA; Motion Analysis & Human Performance, Center for Neuroscience and Neurological Recovery, Methodist Rehabilitation Center, 1350 East Woodrow Wilson, Jackson, MS 39216, USA.
Phys Ther Sport. 2015 Feb;16(1):22-8. doi: 10.1016/j.ptsp.2014.02.003. Epub 2014 Feb 21.
Even some time after a ruptured ACL has been reconstructed thigh musculature atrophy, voluntary activation, and knee-extensor strength deficits may be encountered. The purpose of this study was to evaluate bilateral knee-extension strength, voluntary activation of the quadriceps, and thigh circumference in males and females with ACL reconstruction (ACLR).
Within-subject and between-subject designs were used to evaluate 24 unilateral ACLR individuals and 23 controls.
Isokinetic knee-extension strength was assessed in ACLR participants while central activation ratio (CAR) and thigh circumference measures were obtained from both groups.
Knee-extensor strength deficits (p < .039) and lower CAR of the quadriceps were found in the ACLR limb compared to the uninvolved limb (p = .047). Extensor strength was greater in males (p < .001), however, CAR was not different between sexes (p = .086). No difference in voluntary activation was revealed among the ACLR limb, uninvolved limb, and control limb when compared as independent groups (p = .460). The strength deficits found in the ACLR limb are partly attributable to lower voluntary activation compared to the uninvolved leg, given that no difference was found in thigh circumference between legs.
Clinicians should consider the deficits in muscle function when returning patients to pre-injury activity levels.
即使在重建破裂的前交叉韧带（ACL）后的一段时间，仍可能出现大腿肌肉萎缩、自主激活能力以及膝关节伸肌力量不足的情况。本研究的目的是评估接受ACL重建术（ACLR）的男性和女性的双侧膝关节伸展力量、股四头肌的自主激活能力以及大腿围度。
采用受试者内和受试者间设计来评估24名单侧ACLR个体和23名对照者。
对ACLR参与者进行等速膝关节伸展力量评估，同时从两组获取中枢激活率（CAR）和大腿围度测量值。
与未受累肢体相比，ACLR肢体出现膝关节伸肌力量不足（p < .039），股四头肌的CAR较低（p = .047）。男性的伸肌力量更大（p < .001），然而，两性之间的CAR没有差异（p = .086）。将ACLR肢体、未受累肢体和对照肢体作为独立组进行比较时，未发现自主激活存在差异（p = .460）。由于两腿之间的大腿围度没有差异，ACLR肢体中发现的力量不足部分归因于与未受累腿相比自主激活较低。
临床医生在让患者恢复到受伤前的活动水平时应考虑肌肉功能的不足。
