Volume 8, Issue 2 (5-2021)                   J. Res. Orthop. Sci. 2021, 8(2): 57-64 | Back to browse issues page


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Taghizadeh Kerman M, Yalfani A, Ebrahimi Atri A, Mousavi S H. Knee Muscle Activity During Jump Landing Tasks Following Anterior Cruciate Ligament Reconstruction: A Review Study. J. Res. Orthop. Sci.. 2021; 8 (2) :57-64
URL: http://jros.iums.ac.ir/article-1-2152-en.html
1- Department of Corrective Exercises and Sport Injuries, Faculty of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamedan, Iran.
2- Department of Exercise Physiology, Faculty of Sport Sciences, Ferdowsi University of Mashhad, Iran.
3- Department of Health and Sport Medicine, Faculty of Physical Education and Sport Sciences, University of Tehran, Iran.
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1. Context
The most common Anterior Cruciate Ligament (ACL) injuries occur during single-leg landing, sudden pivoting, or cutting maneuvers in sports activities. These movements can cause the loss of balance control and lead to abnormal loading on the knee joint [1]. Most non-contact ACL tears were knee angle <30° and lack of alignment occurred in the ankle, knee, and hip joints [2, 3], i.e., the valgus collapse [4]. An ACL injury causes improper performance, i.e., often associated with a prolonged absence of the athlete and the prevalence of arthritis development [5]. Therefore, ACL injury prevention exercises were provided for athletes [6]. More than 100000 individuals experience the reconstruction of ACL in the United States, annually [7]. 
More ACL surgeries are performed with the autograft and allograft tissues. Furthermore, there was no significant difference in the achieved results by using allograft and autograft in the ACL reconstruction method [8]. Most orthopedic surgeons favor reconstruction in an athlete with ACL deficiency who expects to return to sports participation after ACL injury [9]. It is estimated that young athletes who successfully return to sports are approximately 30-40 times more prone to predispose secondary knee injuries. Despite the improvement in ACLR rehabilitation protocols, muscle weakness, movement deficits, abnormal neuromuscular control, and difficulty in returning to activity are common for numerous years after surgery. These characteristics predispose athletes to recurrent ACL injuries [10]. Return to acceptable physical performance to pre-injury level depends on the rehabilitation process. Besides, it requires a serious focus on quadriceps and hamstring muscle contraction [11, 12]. Athletes who fail to meet the minimum criteria for returning to sports may experience a neuromuscular malfunction and incorrect movement patterns [13]. Neuromuscular control is essential and defined as the unconscious activation of muscles for joint stability [14]. 
Deficits in neuromuscular control can enhance the extra burden on the knee joint during daily living activities and generate cartilage damage over time [15]. To avoid the anterior tibia shear force, impaired movement patterns are observed as a protective mechanism in the patient with ACL defect and reconstruction [16]. One aspect that requires evaluation is the mechanical stability of the knee. This condition may be restored; however, the neurosensory defect remains constant [17]. The increased sensitivity of muscle spindles induced by proper muscle activity significantly impacts joint stiffness and stability [18]. The onset of muscle activity can be assessed using Electromyography (EMG) by identifying the first action potential of the motor units, i.e., continuously generated before touchdown [19]. 
A recent case study signified a risk factor for an ACL injury to be the delayed onset of muscle activity after initial contact during landing. The indicator of muscle activation, as onset time, has been evaluated to compare injured ACL with healthy controls. This factor can be a key aspect in defining an injury profile or decision to return to play [20]. Changes in the activity of the quadriceps, hamstrings, and both heads of the gastrocnemius muscles are the post-surgery risk factors for injury and re-injury [21, 22]. Studies revealed that women exhibit higher quadriceps/hamstring muscle activity. In other words, hamstring muscle activity is not increased to compensate for elevated quadriceps muscle activity in females [23]. Some discrepancies have been raised between patients with ACL and healthy individuals; however, the relevant evidence is scarce and unclear. Therefore, the present review article aimed to compare knee muscle activity in healthy and ACLR groups during landing tasks.

2. Methods
This systematic review has been reported using Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [24] (Figure 1).

Search strategy
Electronic databases, such as PubMed, Web of Science, and Embase were searched. The following keywords were combined to the search: “Anterior cruciate ligament or ACL, EMG or Electromyography, Muscle activation, Landing, Jumping, hopping”. The search was limited to articles published from 1990-2020 in English. 

Eligibility criteria
The research designs of the cohort, case-control, and cross-sectional were entered the systematic review. Studies were qualified if they compared healthy male and/or female subjects to reconstructed samples related to ACL. Studies using superficial EMG to evaluate activity (mean muscle activity/peak) or timing (onset/duration) before landing jump activities were included in our study. All studies that considered ACLD patients and activities other than jump and landing were excluded. 

Study selection
Two reviewers (MT, SHM) independently examined the abstracts and titles according to the inclusion criteria. Moreover, they mentioned the relevant reason in case they were rejected. A third reviewer (AY) did the arbitration in case of disagreements. In the initial search, 937 articles were found. After reviewing the titles, abstracts, and full text of the articles, 7 articles were included in the present review study. 

Quality evaluation
The Critical Appraisal Skills Program (CASP) is recommended by the National Health Service (NHS) Public Health Resource Unit to evaluate observational studies [25]. This 12-item checklist assesses the validity, methodological quality, and generalizability of the studies. We investigated the existing articles using this tool. Based on the 12-key criteria, the maximum score equals 12. Methodological quality was categorized into 3 levels of high (9≥), moderate (8≤5), or weak to help interpret the quality of the study.

3. Results
Using the above-mentioned search method, we obtained 7 articles according to the inclusion criteria. The methodological quality of the observational studies ranged from 6 to 8 out of 12 that reflected the moderate quality of the methodology. Table 1 displays the scores of the included papers based on the CASP scale.

The details of the included articles have been presented in Table 2.

4. Discussion
The feed-forward mechanism plays an essential role in producing force for the correct alignment of the lower limb during landing. In other words, the onset of muscle activity increases the stiffness or stability of the joints before landing. However, improper timing may cause the non-alignment of the knee, increasing recurrent ACL injury [26]. The result of this systematic review suggested that the ACLR group presented different muscle activities during landing tasks, compared to the healthy subject, regardless of graft type, at the time of return to exercise. Rocchi et al. indicated earlier muscle activity for all muscles considered (VM, VL, RF, BF, & ST) in 4 tasks in the ACLR group, compared to the controls [26]. This result is consistent with those of Gokeler and associates [27]. They signified the earlier onset of muscle activation in the involved limbs of male and female ACLR groups, compared to the groups with non-involved limbs and the controls [27]. Thus, patients who unconsciously or consciously employ feedforward control strategies for joint stiffness also reported decreased knee flexion angels in the involved limb [27]. 
The pre-tension of muscles increases the sensitivity of the spindle and joint perturbation identified immediately. Rocchi et al. detected no significant difference in pre-impact EMG duration between the two ACLR groups. The choice of graft type seems not to affect neuromuscular abnormalities in landing tasks upon returning to sports activities [26]. Ortiz et al. found a significant difference in the neuromuscular activity of quadriceps and the rate of quadriceps/hamstring co-contraction between ACLR and uninjured females [28].
The study participants in the ACLR group may require further contraction and activation of quadriceps, i.e., a problem in eccentric control than healthy individuals. Additionally, increased co-contraction between agonists and antagonists was associated with facilitating the process of learning new tasks and improving the stability of the lower limbs. Thus, the increased muscle activity observed in patients with ACL reconstruction may be a sign of such strategies to perform a successful landing [29]. 
Ortiz et al. also investigated the lower limb muscle activity in two tasks among ACLR and healthy women. Accordingly, they found no significant difference in the hamstring, quadriceps amplitude EMG, and quadriceps/hamstring contraction rate between the research groups. These data indicated the anterior-posterior dynamic stability of the knee in the ACLR group [30]. Such a condition was induced by the time lapsed from surgery (1 to 16 years), i.e., considerably different. Thomas et al. identified no significant difference between the before phase quad/ham activity ratios of ACL intact and ACL reconstructed subjects, or between those of males and females [31]. These differences could be attributed to the time lapsed surgery and the type of jump task, as well as the gender of the subjects. 
Other researchers reported that ACLR individuals presented a sensory defect in the reconstructed knee. Such sensory deficits are assumed to be caused by impaired proprioception [32] or more specifically, damaged ACL mechanoreceptors [33, 34]. The studies indicated that the rate of gastrocnemius/hamstring activation was not significantly different between ACL intact individuals and ACLR individuals, and between males and females [31]. 

5. Conclusion
Based on the literature, this review concluded that ACLR individuals exhibit different neuromuscular activity strategies during jump landing. Furthermore, patients manifested earlier onset muscle activity out of the healthy values as demonstrated in controls. In addition to the earlier onset of the quadriceps muscles activation than that of the hamstring muscle during the jump, the landing was a risk for the recurrent ACL injury. Specialists are suggested to analyze onset EMG duration in landing tasks at the time of return to sports. Moreover, the neuromuscular motor program can be an effective tool for deciding whether to return to sports or not in athletes. However, relevant evidence is scarce; thus, further studies are recommended to focus on whether and how the asymmetries of muscle activity and muscle timing may modify over time and whether rehabilitation exercises can improve them. 

Ethical Considerations
Compliance with ethical guidelines

The study is a review article and there is no need for ethical approve.

Funding
This research did not receive any grant from funding agencies in the public, commercial, or non-profit sectors. 

Authors' contributions
Investigation and draft preparation: Maedeh Taghizadeh Kerman; Review and edit: Ali Yalfani, Ahmad Ebrahimi Atri; Supervision: Maedeh Taghizadeh Kerman and Seyyed Hamed Mousavi.

Conflict of interest
The authors declared no conflict of interest.

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Type of Study: Review Paper | Subject: Knee surgery
Received: 2021/01/19 | Accepted: 2021/04/24 | Published: 2021/05/1

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