Understanding the effects of a sudden directional shift in somatosensory feedback and increasing task complexity on postural adaptation in individuals with and without chronic ankle instability.

BACKGROUND: Individuals with chronic ankle instability (CAI) present somatosensory dysfunction following an initial ankle sprain. However, little is known about how individuals with CAI adapt to a sudden sensory perturbation of instability with increasing task and environmental constraints to maintain postural stability. METHODS: Forty-four individuals with and without unilateral CAI performed the Adaptation Test to a sudden somatosensory inversion and plantarflexion perturbations (environment) in double-, injured-, and uninjured- limbs. Mean sway energy scores were analyzed using 2 (group) × 2 (somatosensory perturbations) × 3 (task) repeated measures analysis of variance. RESULTS: There were significant interactions between the group, environment, and task (P=.025). The CAI group adapted faster than healthy controls to a sudden somatosensory inversion perturbation in the uninjured- (P=.002) and injured- (P<.001) limbs, as well as a sudden somatosensory plantarflexion perturbation in the double- (P=.033) and uninjured- (P=.035) limbs. The CAI and healthy groups presented slower postural adaptation to a sudden inversion perturbation than a sudden somatosensory plantarflexion perturbation in double-limb (P<.001). Whereas both groups demonstrated faster postural adaptation to a sudden somatosensory inversion perturbation compared to somatosensory plantarflexion perturbation while maintaining posture in the injured- (P<.001) and uninjured- (P<.001) limbs. The CAI and healthy groups adapted faster to a sudden somatosensory inversion perturbation in the injured- (P<.001) and uninjured- (P<.001) limbs than in double-limb, respectively. DISCUSSION: Postural adaptation in individuals with and without CAI depended on environmental (somatosensory perturbations) and task constraints. The CAI group displayed comparable and faster postural adaptation to a sudden somatosensory inversion and plantarflexion in double-, injured-, and uninjured- limbs, which may reflect a centrally mediated alteration in neuromuscular control in CAI.

Sensory Reweighting System Differences on Vestibular Feedback with Increased Task Constraints in Individuals with Chronic Ankle Instability Compared to Healthy Controls.

CONTEXT: Chronic ankle instability (CAI) is associated with a less flexibly adaptable sensorimotor system. Thus, individuals with CAI may present an inadequate sensory reweighting system inhibiting the ability to emphasize weight on reliable sensory feedback to control posture. However, how individuals with CAI reweight sensory feedback to maintain postural control in bilateral and unilateral stances has yet to be established. OBJECTIVES: The primary purpose was to examine group differences in how the sensory reweighting system changes to control posture in a simple double-limb stance and a more complex single-limb stance (uninjured-limb, injured-limb) under increased environmental constraints manipulating somatosensory and visual information for individuals with and without CAI. The secondary purpose was to examine the effect of environmental and task constraints on postural control. STUDY DESIGN: Case-control study. SETTING: Laboratory. PATIENTS OR OTHER PARTICIPANTS: 21 individuals with CAI (26.4±5.7years, 171.2±9.8cm, 76.6±15.17kg) and 21 healthy controls (25.8±5.7years, 169.5±9.5cm, 72.4±15.0kg) participated in the study. MAIN OUTCOME MEASURE(S): Equilibrium10 were examined while completing 6 environmental conditions of the Sensory Organization Test (SOT) during 3 tasks (double-limb and single-limb [uninjured, injured] stances). Sensory reweighting ratios for sensory systems (somatosensory, vision, vestibular) were computed from paired Equilibrium10. RESULTS: Significant 3-factor interactions were found between group, sensory systems, and tasks (P=0.006) and for groups, task, and environment (P=0.007). The CAI group failed to downweight vestibular feedback compared to healthy controls while maintaining posture in the injured-limb (P=0.030). The CAI group displayed better postural stability than healthy controls while standing with absent vision, fixed surroundings, and a moving platform in the injured-limb (P=0.032). CONCLUSIONS: The CAI group relied on vestibular feedback while maintaining better postural stability than healthy controls in the injured-limb. Group differences in postural control depended on both environmental (absent vision, moving platform) and task (injured-limb) constraints.

Preoperative Psychosocial Factors and Short-term Pain and Functional Recovery After Hip Arthroscopy for Femoroacetabular Impingement Syndrome.

CONTEXT: Low mental health scores, depression, and anxiety are associated with worse pain and functional outcomes after hip arthroscopy for patients with femoroacetabular impingement syndrome (FAIS). Preoperative screening of psychosocial factors such as self-efficacy, kinesiophobia, and pain catastrophizing may further aid in identifying patients at risk for poorer outcomes. OBJECTIVE: To compare preoperative function and psychosocial factors between patients with and those without elevated postoperative pain 3 months after hip arthroscopy for FAIS. DESIGN: Prospective cohort study. SETTING: University health center. PATIENTS OR OTHER PARTICIPANTS: Fifty-one individuals with FAIS (41 women, 10 men; age = 37.6 ± 12.3 years, body mass index = 27.1 ± 4.1 kg/m2). MAIN OUTCOME MEASURE(S): Preoperatively, participants completed the Pain Self-Efficacy Questionnaire (PSEQ), Tampa Scale for Kinesiophobia (TSK), Pain Catastrophizing Scale (PCS), 12-Item International Hip Outcome Tool (iHOT-12), and a 10-point visual analog scale (VAS) for hip pain at rest and during activity. Three months postoperatively, they completed the PSEQ, TSK, PCS, iHOT-12, and VAS. Preoperative scores were compared between those with (VAS ≥ 3) and those without (VAS < 3) elevated postoperative pain using Mann-Whitney U tests, and odds ratios were calculated to determine the odds of having elevated postoperative pain and lower postoperative function. RESULTS: Participants with elevated postoperative pain at rest and during activity had worse preoperative psychosocial health (P ≤ .04). Those with elevated postoperative pain at rest had worse preoperative function (P < .001). The odds of having elevated postoperative pain at rest were 45 times and 4.5 times higher for those with low self-efficacy and high pain catastrophizing, respectively (P values ≤ .03). The odds of having elevated postoperative pain during activity were 7.1, 6.2, and 3.5 times higher for those with low self-efficacy, high kinesiophobia, and high pain catastrophizing, respectively (P values ≤ .04). The odds of having lower postoperative iHOT-12 scores were 7.5 and 14.0 times higher for those with high kinesiophobia and pain catastrophizing, respectively (P values ≤ .03). CONCLUSIONS: Poor preoperative psychosocial health increased the odds of elevated pain and worse function 3 months after hip arthroscopy for FAIS. This is a first step in identifying the psychosocial factors that may contribute to poorer long-term hip arthroscopy outcomes.

The Relationship Between Patient Expectations and Functional Outcomes in Patients Undergoing Cartilage Repair of the Knee: A Mixed Methods Study.

CONTEXT: Patient expectations have been shown to be a major predictor of outcomes. Fulfilled expectations have been linked to increased patient satisfaction and rehabilitation adherence. Expectations may be influenced by a variety of factors, including patient characteristics, preoperative function, or disease characteristics. It is currently unknown what factors may influence patient expectations prior to cartilage repair of the knee, and to what degree. Furthermore, understanding the importance and values of those expectations for recovery using mixed methods has not previously been conducted in this patient population. The purpose of this mixed methods study is to examine and explore the relationships between patient expectations and functional outcome in patients undergoing cartilage repair of the knee. DESIGN: A mixed methods design was used. METHODS: Twenty-one patients scheduled to undergo cartilage repair of the knee were included. Participants completed the Hospital for Special Surgery Knee Surgery Expectations Survey and the Knee Injury and Osteoarthritis Outcome Score at their preoperative visit. Knee Injury and Osteoarthritis Outcome Scores were also obtained at 3 and 6 months postsurgery. A selected sample of 6 participants participated in semi-structured interviews 6 months postsurgery. Pearson correlation coefficients were used to determine relationships between expectations and functional outcome. RESULTS: Patients have moderate expectations for recovery, and these expectations were positively associated with preoperative pain, activities of daily living, and quality of life. Expectations also correlated with symptoms 3 months postsurgery, but there were no other significant correlations between preoperative expectations and postoperative function in the short term. Four qualitative themes emerged as participants described how previous recovery experiences shaped their expectations. CONCLUSIONS: Formalized patient and caregiver education, prehabilitation, and the use of psychological skills during rehabilitation may help to manage patient expectations and provide more focused and individualized care, thus improving outcomes.

Low self-efficacy increases the odds of elevated post-operative pain following hip arthroscopy for femoroacetabular impingement syndrome.

CONTEXT: Low mental health scores, depression, and anxiety are associated with worse pain and functional outcomes following hip arthroscopy for femoroacetabular impingement syndrome (FAIS). Pre-operative screening of psychosocial factors such as pain catastrophizing, self-efficacy, and kinesiophobia may further aid in identifying patients at-risk for poorer outcomes. OBJECTIVE: Compare pre-operative function and psychosocial factors between patients with and without elevated post-operative pain three-months following hip arthroscopy for FAIS. DESIGN: Prospective cohort Setting: University health center Participants: 51 individuals with FAIS (41F/10M; age:37.6±12.3years; BMI:27.1±4.1kg/m2) Outcome measures: Pre-operatively participants completed the Pain Self-Efficacy Questionnaire (PSEQ), Tampa Scale for Kinesiophobia (TSK), Pain Catastrophizing Scale (PCS), 12-Item International Hip Outcome Tool (iHOT-12), and a 10-point visual analog scale (VAS) for hip pain at rest and during activity. Three-months post-operatively, participants completed the PSEQ, TSK, PCS, iHOT-12 and VAS. Pre-operative scores were compared between those with (VAS≥3) and without (VAS<3) elevated post-operative pain using Mann-Whitney U tests, and odds ratios were calculated to determine the odds of having elevated post-operative pain and lower post-operative function. RESULTS: Participants with elevated post-operative pain at rest and during activity had worse pre-operative psychosocial health (p≤0.04). Those with elevated pain at rest had worse pre-operative function (p≤0.001). The odds of having elevated post-operative pain at rest were 45 times and 4.5 times higher for those with low self-efficacy and high pain catastrophizing (p≤.03).

A Comparison of Neuromuscular Electrical Stimulation Parameters for Postoperative Quadriceps Strength in Patients After Knee Surgery: A Systematic Review.

CONTEXT: Postoperative quadriceps strength weakness after knee surgery is a persistent issue patients and health care providers encounter. OBJECTIVE: To investigate the effect of neuromuscular electrical stimulation (NMES) parameters on quadriceps strength after knee surgery. DATA SOURCES: CINAHL, MEDLINE, SPORTDiscus, and PubMed were systematically searched in December 2018. STUDY SELECTION: Studies were excluded if they did not assess quadriceps strength or if they failed to report the NMES parameters or quadriceps strength values. Additionally, studies that applied NMES to numerous muscle groups or simultaneously with other modalities/treatments were excluded. Study quality was assessed with the Physiotherapy Evidence Database (PEDro) scale for randomized controlled trials. STUDY DESIGN: Systematic review. LEVEL OF EVIDENCE: Level 1. DATA EXTRACTION: Treatment parameters for each NMES treatment was extracted for comparison. Quadriceps strength means and standard deviations were extracted and utilized to calculate Hedge g effect sizes with 95% CIs. RESULTS: Eight RCTs were included with an average Physiotherapy Evidence Database scale score of 5 ± 2. Hedge g effect sizes ranged from small (-0.37; 95% CI, -1.00 to 0.25) to large (1.13; 95% CI, 0.49 to 1.77). Based on the Strength of Recommendation Taxonomy Quality of Evidence table, the majority of the studies included were low quality RCTs categorized as level 2: limited quality patient-oriented evidence. CONCLUSION: Because of inconsistent evidence among studies, grade B evidence exists to support the use of NMES to aid in the recovery of quadriceps strength after knee surgery. Based on the parameters utilized by studies demonstrating optimal treatment effects, it is recommended to implement NMES treatment during the first 2 postoperative weeks at a frequency of ≥50 Hz, at maximum tolerable intensity, with a biphasic current, with large electrodes and a duty cycle ratio of 1:2 to 1:3 (2- to 3-second ramp).

Low Self-Efficacy and High Kinesiophobia Are Associated With Worse Function in Patients With Femoroacetabular Impingement Syndrome.

CONTEXT: Femoroacetabular impingement syndrome (FAIS) is a painfully debilitating hip condition disproportionately affecting active individuals. Mental health disorders are an important determinant of treatment outcomes for individuals with FAIS. Self-efficacy, kinesiophobia, and pain catastrophizing are psychosocial factors that have been linked to inferior outcomes for a variety of orthopedic conditions. However, these psychosocial factors and their relationships with mental health disorders, pain, and function have not been examined in individuals with FAIS. OBJECTIVE: (1) To examine relationships between self-efficacy, kinesiophobia, pain catastrophizing, pain, and function in patients with FAIS and (2) to determine if these variables differ between patients with and without a self-reported depression and/or anxiety. DESIGN: Cross-sectional. SETTING: University health center. PARTICIPANTS: Fifty-one individuals with FAIS (42 females/9 males; age 35.7 [11.6] y; body mass index 27.1 [4.9] kg/m2). MAIN OUTCOME MEASURES: Participants completed the Pain Self-Efficacy Questionnaire, Tampa Scale for Kinesiophobia, Pain Catastrophizing Scale, visual analog scale for hip pain at rest and during activity, and the 12-item International Hip Outcome Tool. Self-reported depression and/or anxiety were recorded. The relationships between psychosocial factors, pain, and function were examined using Spearman rank-order correlations. Independent t tests and Mann-Whitney U tests were used to evaluate the effect of self-reported depression and/or anxiety on psychosocial factors, pain and function. RESULTS: The 12-item International Hip Outcome Tool was correlated with pain during activity (ρ = -.57, P ≤ .001), Tampa Scale for Kinesiophobia (ρ = -.52, P ≤ .001), and Pain Self-Efficacy Questionnaire (ρ = .71, P ≤ .001). The Pain Self-Efficacy Questionnaire was also correlated with pain at rest (ρ = -.43, P = .002) and pain during activity (ρ = -.46, P = .001). Individuals with self-reported depression and/or anxiety (18/51; 35.3%) had worse self-efficacy and pain catastrophizing (P ≤ .01). CONCLUSION: Self-reported depression and/or anxiety, low self-efficacy, and high kinesiophobia were associated with more hip pain and worse function for patients with FAIS. These findings warrant further examination including psychosocial treatment strategies to improve the likelihood of a successful clinical outcome for this at-risk population.

Health-Related Quality of Life Among Middle-Aged Adults With Chronic Ankle Instability, Copers, and Uninjured Controls.

CONTEXT: People with chronic ankle instability (CAI) display a lower regional and global health-related quality of life (HRQoL). Examinations of HRQoL outcomes associated with CAI have addressed younger adults, restricting our understanding of the long-term consequences of CAI. OBJECTIVE: To compare ankle regional and global HRQoL in middle-aged participants with and those without CAI. DESIGN: Cross-sectional study. SETTING: Laboratory. PATIENTS OR OTHER PARTICIPANTS: A total of 59 middle-aged volunteers, consisting of 18 with CAI (age = 50.2 ± 9.3 years), 17 who were ankle-sprain copers (age = 54.5 ± 8.7 years), and 24 uninjured controls (age = 56.7 ± 10.0 years). MAIN OUTCOME MEASURE(S): Participants completed the Foot and Ankle Disability Index (FADI) and the Patient-Reported Outcomes Measurement Information System Adult Profile. Regional HRQoL was assessed using the FADI Activities of Daily Living and Sport subscales. Global HRQoL was measured using the 43-item Patient-Reported Outcomes Measurement Information System Adult Profile, which contains 7 short forms-Physical Function, Pain Interference, Fatigue, Depression, Sleep Disturbance, Anxiety, and Ability to Participate in Social Roles and Activities. Separate Kruskal-Wallis tests were used to determine between-groups differences. RESULTS: Middle-aged participants with CAI had lower scores on both subscales of the FADI than the coper and control groups (all P values <.001). Participants with CAI scored lower on the Physical Function (U = 116.0, z = -2.78, P = .005) and Ability to Participate in Social Roles and Activities (U = 96.0, z = -3.09, P = .002) subscales but higher on the Pain Interference (U = 144.0, z = -2.36, P = .02), Fatigue (U = 110.0, z = -2.72, P = .006), and Depression (U = 110.5, z = -2.91, P = .004) subscales than the control group. Participants with CAI also scored lower on the Physical Function (U = 74.5, z = -2.79, P = .005) and Ability to Participate in Social Roles and Activities (U = 55.0, z = -3.29, P = .001) subscales but higher on the Fatigue (U = 90.0, z = -2.09, P = .04) and Depression (U = 96.5, z = -1.97, P = .048) subscales than the coper group. CONCLUSIONS: Middle-aged participants with CAI displayed worse ankle regional and global HRQoL than their age-matched healthy counterparts and copers. These results demonstrated that CAI can affect HRQoL outcomes in middle-aged adults.

Decreased ankle and hip isometric peak torque in young and middle-aged adults with chronic ankle instability.

OBJECTIVES: To compare ankle, knee and hip isometric peak torque between young and middle-aged adults with CAI, copers and un-injured controls. DESIGN: Cross-sectional. SETTING: Research Laboratory. PARTICIPANTS: One hundred fifty-six young and middle-aged adults with or without CAI volunteered. MAIN OUTCOME MEASURES: A handheld dynamometer measured isometric dorsiflexion, plantarflexion, knee extension, hip extension and hip abduction peak force during a 5 s trial. Average peak torque was calculated and normalized to body mass. RESULTS: A significant Age by Injury interaction for dorsiflexion suggest middle-aged un-injured controls (p < 0.001) and copers (p < 0.001) had lower isometric peak torque compared to their young adult counterparts, but there were no differences between young and middle-aged adults with CAI (p > 0.05). Significant Injury main effects suggest the CAI group had decreased plantarflexion (p = 0.004) and hip extension (p = 0.010) strength compared to un-injured controls, but not copers (p > 0.05). Significant Age main effects for all primary outcome measures were observed, indicating peak torque decreased with age (p < 0.05). CONCLUSIONS: Regardless of age, isometric ankle and hip peak torque was lower in participants with CAI compared to un-injured controls, but not copers. These findings provide further evidence towards the impact of CAI in both young and middle-aged adults.

Higher Body Mass Index Adversely Affects Knee Function After Anterior Cruciate Ligament Reconstruction in Individuals Who Are Recreationally Active.

OBJECTIVE: Our aim was to investigate the effect of body mass index (BMI) levels on quadriceps and hamstring strength and functional outcomes up to 6 months after anterior cruciate ligament reconstruction (ACLR) with hamstring tendon autograft (HTG). DESIGN: Prospective, controlled study. SETTING: University clinical laboratory. PATIENTS: Ninety-one participants who had undergone unilateral ACLR with HTG were divided into 2 groups according to their BMI. The participants whose BMI were between 18.5 and 24.9 kg/m were included in group 1 (n = 50, age: 27.2 ± 6.7 years, BMI: 22.3 ± 1.6 kg/m) and those whose BMI > 24.9 kg/m were included in group 2 (n = 41, age: 30.2 ± 6.9 years, BMI: 28.0 ± 2.4 kg/m). INTERVENTIONS: Quadriceps and hamstring strength, functional performance including hop, jump, and balance performance, and IKDC score. MAIN OUTCOME MEASURES: Maximum voluntary isometric contraction of the quadriceps and hamstring muscles and the body mass were measured at 1, 3, and 6 months after surgery. Absolute peak torques and normalized peak torques to body weight for both limbs were recorded. Functional outcomes were evaluated at 6 months after surgery. RESULTS: Normalized quadriceps strength improvement was lower in group 2 when compared with group 1 (F(2,178) = 6.23, P = 0.003). Group 2 also demonstrated lower scores in functional performance (P < 0.05). Normalized hamstring and absolute quadriceps and hamstring strength improvement was not affected by higher BMI level (P > 0.05). CONCLUSIONS: Higher BMI levels adversely affect quadriceps strength capacity and performance in patients who have undergone ACLR with HTG. Clinicians should consider BMI levels of patients when assessing and targeting muscle recovery because it could negatively affect the success of the ACLR rehabilitation.

Relationship Between Pain Catastrophizing and 6-Month Outcomes Following Anterior Cruciate Ligament Reconstruction.

BACKGROUND: Pain catastrophizing predicts poor outcomes following orthopedic procedures for patients with chronic conditions; however, limited research has focused on acute injuries. This study aimed to quantify the progression of Pain Catastrophizing Scale (PCS) scores from injury to 6-months post-anterior cruciate ligament reconstruction (ACLR) and determine if preoperative or 6-month PCS scores were related with self-reported pain or function 6 months post-ACLR. The authors hypothesized PCS scores would minimally fluctuate and would be related with worse outcomes 6-months post-ACLR. METHODS: All 48 participants (27 male/21 female; aged 22.7 [4.6] y, body mass index 24 [3.3]) included in this secondary analysis of a randomized control trial sustained an ACL injury during sports activity. Participants completed the PCS and Pain Visual Analog Scale (VAS) at 5 time points: within 7 days of injury (INITIAL), day of surgery, 2 weeks postoperative (2W), 6 weeks postoperative (6W), and 6 months postoperative (6M). They completed the Knee Injury and Osteoarthritis Outcome Score (KOOS) at 6M. Wilcoxon signed-rank tests and Spearman rank-order correlations were used for analysis. RESULTS: PCS scores were not fixed (INITIAL: 11.6 [10.8], day of surgery: 2.5 [3.7], 2W: 8.0 [7.8], 6W: 3.7 [6], 6M: 0.8 [2.3]). They fluctuated in response to injury and ACLR similar to Pain VAS scores. Preoperative PCS scores were not related with 6M outcomes; however, 6M PCS scores were significantly related with 6M Pain VAS and KOOS subscales. CONCLUSIONS: PCS scores fluctuated in response to injury and ACLR. Preoperative PCS scores were not related with 6M outcomes; however, 6M PCS scores correlated with pain and function at 6M. High pain catastrophizing appears to be a natural response immediately following acute ACL injury and ACLR, but may not be indicative of a poor postoperative result. PCS scores 6-months following ACLR may provide useful information regarding self-reported pain and function.

THE EFFECT of ONE-ON-ONE INTERVENTION in ATHLETES with MULTIPLE RISK FACTORS for INJURY.

BACKGROUND: Lower extremity injuries in soccer players are extremely common. Implementation of group injury prevention programs has gained popularity due to time and cost-effectiveness. Unfortunately, players with greater number of risk factors are most likely to sustain an injury, yet less likely to benefit from a group injury prevention program. The purpose of this study was to determine if targeting these high risk players with one-on-one treatment would result in a reduction in the number of risk factors they possess. The authors hypothesized that fifty percent or more of subjects receiving one-on-one intervention would have a reduction of ≥1 risk factor(s). STUDY DESIGN: Quasi-experimental pretest-posttest design. METHODS: Division I men's and women's soccer players were screened for modifiable risk factors using a battery of tests which assessed mobility, fundamental movement pattern performance, motor control, and pain. Players with ≥ 3 risk factors ("high risk") received one-on-one treatment from a physical therapist via an algorithm twice per week for four weeks. Players with < 3 risk factors ("low risk") did not receive one-on-one intervention. RESULTS: The proportion of treatment successes in the intervention group was 0.923 (95% CI 0.640-0.998). A significant proportion of high risk subjects (0.846) became low risk at posttest (p = 0.003). A significant between group difference was noted in risk factor change from pretest to posttest (p = 0.002), with the median risk factor change in the intervention group being -3. CONCLUSION: Utilizing one-on-one interventions designed to target evidence-based risk factors is an effective strategy to eliminate LE musculoskeletal injury risk factors in high risk individuals. LEVELS OF EVIDENCE: 2b.

Decreased dynamic balance and dorsiflexion range of motion in young and middle-aged adults with chronic ankle instability.

OBJECTIVES: The purpose of this study was to compare dynamic balance and weight-bearing dorsiflexion range of motion between young and middle-aged adults with and without chronic ankle instability. DESIGN: Cross-sectional. METHODS: One hundred and two young adults were classified as either having chronic ankle instability (n = 38), coper (n = 27) or a healthy-control (n = 37). A total of 55 middle-aged adults were identified as having chronic ankle instability (n = 16), coper (n = 15) or a healthy-control (n = 24). Participants completed the weight-bearing lunge test and the anterior, posteromedial and posterolateral reach directions of the star excursion balance test. RESULTS: Middle-aged adults had shorter reach distances for each direction of the star excursion balance test compared to the young adults (p < 0.001). Regardless of age, participants with chronic ankle instability performed worse on the star excursion balance test compared to the coper (p < 0.05) and healthy-control group (p < 0.05). Similarly, participants with chronic ankle instability had less dorsiflexion compared to healthy-controls (p < 0.05), but not the coper group (p > 0.05). CONCLUSIONS: Deficits in dynamic postural control do not continue to decline with advancing age in individuals with chronic ankle instability, however, these impairments appear to continue to persist compared to uninjured controls.

Repeated Impacts Diminish the Impact Performance of Equestrian Helmets.

Context: During thoroughbred races, jockeys are placed in potentially injurious situations, often with inadequate safety equipment. Jockeys frequently sustain head injuries; therefore, it is important that they wear appropriately certified helmets. Objective: The goals of this study are (1) to perform impact attenuation testing according to ASTM F1163-15 on a sample of equestrian helmets commonly used by jockeys in the United States and (2) to quantify headform acceleration and residual crush after repeat impacts at the same location. Participants and Design: Seven helmet models underwent impact attenuation testing according to ASTM F1163-15. A second sample of each helmet model underwent repeat impacts at the crown location for a total of 4 impacts. Setting: Laboratory. Intervention: Each helmet was impacted against a flat and equestrian hazard anvil. Main Outcome Measures: Headform acceleration was recorded during all impact and computed tomography scans were performed preimpact and after impacts 1 and 4 on the crown to quantify liner thickness. Results: Four helmets had 1 impact that exceeded the limit of 300g. During the repeated crown impacts, acceleration remained below 300g for the first and second impacts for all helmets, while only one helmet remained below 300g for all impacts. Foam liner thickness was reduced between 5% and 39% after the first crown impact and between 33% and 70% after the fourth crown impact. Conclusions: All riders should wear a certified helmet and replace it after sustaining a head impact. Following an impact, expanded polystyrene liners compress, and their ability to attenuate head acceleration during subsequent impacts to the same location is reduced. Replacing an impacted helmet may reduce a rider's head injury risk.

Visual perturbation impacts upright postural stability in athletes with an acute concussion.

OBJECTIVE: The impact that visual perturbation has on upright postural stability in an athlete with a concussion has not been established. The present study aimed to characterize the influence that visual perturbation stimuli have on upright balance among athletes with acute concussions. DESIGN: A 2X2X2 repeated measure designed was used. METHOD: The present study examined the influence visual perturbation has on individuals suffering from an acute concussion. Fourteen participants (7 with a concussion and 7 matched controls) underwent various balance assessments with and without visual perturbation. RESULTS: Overall, athletes with acute concussions demonstrated impairments in balance 24-48 hours following a concussion. However, when assessed using a visual perturbation task, athletes with acute concussions demonstrated improved balance, while control subjects did not show any significant changes during the same visual perturbation task. CONCLUSION: An athlete's ability to disregard visual perturbation stimuli is imperative for successful participation in sports. Due to the observed alterations in balance when given a visual perturbation task, it is suggested that athletes with acute concussions place more attention on the balance task and may disregard other less meaningful tasks.

Decision to Return to Sport Participation After Anterior Cruciate Ligament Reconstruction, Part II: Self-Reported and Functional Performance Outcomes.

CONTEXT: Anterior cruciate ligament (ACL) reconstruction (ACLR) is the most commonly used method for helping athletes regain function and return to preinjury activity levels after ACL injury. Outcomes after ACLR have suggested that athletes return to a level of function that would support a return to sport participation; however, in a recent meta-analysis, pooled return rates were only 55%. It is unclear whether this discrepancy is a result of functional impairments. OBJECTIVE: To compare patient-reported outcomes (PROs), dynamic balance, dynamic functional performance, strength, and muscular endurance in athletes who returned to sport (RTS) and athletes who did not return to sport (NRTS) after ACLR. DESIGN: Case-control study. SETTING: University research laboratory. PATIENTS OR OTHER PARTICIPANTS: Two groups of participants with primary unilateral ACLR: 18 RTS individuals (7 males, 11 females; age = 23 ± 11 years, height = 163.58 ± 40.41 cm, mass = 70.00 ± 21.75 kg, time since surgery = 4.02 ± 3.20 years) and 12 NRTS individuals (5 males, 7 females; age = 26 ± 13 years, height = 171.33 ± 48.24 cm, mass = 72.00 ± 21.81 kg, time since surgery = 3.68 ± 2.71 years). INTERVENTION(S): The PROs consisted of the International Knee Documentation Committee Subjective Knee Evaluation Form, Knee Injury and Osteoarthritis Outcome Score, Tegner Activity Scale, and Marx Activity Scale. Functional performance outcome measures were the anterior and posteromedial reach on the Star Excursion Balance Test, a battery of single-legged-hop tests, isokinetic quadriceps and hamstrings strength at 60°/s and 180°/s, and a novel step-down-to-fatigue test. All measures were taken during a single laboratory session. MAIN OUTCOME MEASURE(S): The Limb Symmetry Index was calculated for all functional performance measures. Mann-Whitney U tests were used to compare measures between groups ( P < .10). RESULTS: Compared with the RTS group, the NRTS group had lower scores on the International Knee Documentation Committee Subjective Knee Evaluation Form (RTS median = 92.52, range = 66.67-97.70; NRTS median = 82.76, range = 63.22-96.55; P = .03) and Knee Injury and Osteoarthritis Outcome Score Symptoms subscale (RTS median = 88, range = 54-100; NRTS median = 71, range = 54-100; P = .08). No differences were observed for any functional performance measures. CONCLUSIONS: The NRTS athletes displayed lower PROs despite demonstrating similar function on a variety of physical performance measures. These results further support existing evidence that physical performance alone may not be the ideal postoperative outcome measure. Measures of patients' symptoms and self-perceived physical function may also greatly influence postoperative activity choices.

Decision to Return to Sport After Anterior Cruciate Ligament Reconstruction, Part I: A Qualitative Investigation of Psychosocial Factors.

CONTEXT: Return-to-sport criteria after anterior cruciate ligament (ACL) injury are often based on "satisfactory" functional and patient-reported outcomes. However, an individual's decision to return to sport is likely multifactorial; psychological and physical readiness to return may not be synonymous. OBJECTIVE: To determine the psychosocial factors that influence the decision to return to sport in athletes 1 year post-ACL reconstruction (ACLR). DESIGN: Qualitative study. SETTING: Academic medical center. PATIENTS OR OTHER PARTICIPANTS: Twelve participants (6 males, 6 females) were purposefully chosen from a large cohort. Participants were a minimum of 1-year postsurgery and had been active in competitive athletics preinjury. DATA COLLECTION AND ANALYSIS: Data were collected via semistructured interviews. Qualitative analysis using a descriptive phenomenologic process, horizontalization, was used to derive categories and themes that represented the data. The dynamic-biopsychosocial model was used as a theoretical framework to guide this study. RESULTS: Six predominant themes emerged that described the participants' experiences after ACLR: (1) hesitation and lack of confidence led to self-limiting tendencies, (2) awareness was heightened after ACLR, (3) expectations and assumptions about the recovery process influenced the decision to return to sport after ACLR, (4) coming to terms with ACL injury led to a reprioritization, (5) athletic participation helped reinforce intrinsic personal characteristics, and (6) having a strong support system both in and out of rehabilitation was a key factor in building a patient's confidence. We placed themes into components of the dynamic-biopsychosocial model to better understand how they influenced the return to sport. CONCLUSIONS: After ACLR, the decision to return to sport was largely influenced by psychosocial factors. Factors including hesitancy, lack of confidence, and fear of reinjury are directly related to knee function and have the potential to be addressed in the rehabilitation setting. Other factors, such as changes in priorities or expectations, may be independent of physical function but remain relevant to the patient-clinician relationship and should be considered during postoperative rehabilitation.

Preventive Neuromuscular Training for Young Female Athletes: Comparison of Coach and Athlete Compliance Rates.

CONTEXT: Fewer athletic injuries and lower anterior cruciate ligament injury incidence rates were noted in studies of neuromuscular-training (NMT) interventions that had high compliance rates. However, several groups have demonstrated that preventive NMT interventions were limited by low compliance rates. OBJECTIVE: To descriptively analyze coach and athlete compliance with preventive NMT and compare the compliance between study arms as well as among school levels and sports. DESIGN: Randomized, controlled clinical trial. SETTING: Middle and high school athletic programs. Participants or Other Participants: A total of 52 teams, comprising 547 female athletes, were randomly assigned to the experimental or control group and followed for 1 athletic season. INTERVENTION(S): The experimental group (n = 30 teams [301 athletes]: 12 basketball teams [125 athletes], 6 soccer teams [74 athletes], and 12 volleyball teams [102 athletes]) participated in an NMT program aimed at reducing traumatic knee injuries through a trunk-stabilization and hip-strengthening program. The control group (n = 22 teams [246 athletes]: 11 basketball teams [116 athletes], 5 soccer teams [68 athletes], and 6 volleyball teams [62 athletes]) performed a resistive rubber-band running program. MAIN OUTCOME MEASURE(S): Compliance with the assigned intervention protocols (3 times per week during the preseason [mean = 3.4 weeks] and 2 times per week in-season [mean = 11.9 weeks] of coaches [coach compliance] and athletes [athlete compliance]) was measured descriptively. Using an independent t test, we compared coach and athlete compliance between the study arms. A 2-way analysis of variance was calculated to compare differences between coach and athlete compliance by school level (middle and high schools) and sport (basketball, soccer, and volleyball). RESULTS: The protocols were completed at a mean rate of 1.3 ± 1.1 times per week during the preseason and 1.2 ± 0.5 times per week in-season. A total of 88.4% of athletes completed 2/3 of the intervention sessions. Coach compliance was greater in the experimental group than in the control group (P = .014). Coach compliance did not differ by sport but was greater at the high school than the middle school (P = .001) level. Athlete compliance did not differ by study arm, sport, or school level. CONCLUSIONS: Athletes received instruction in about 50% of each protocol. Nearly 90% of athletes performed more than 2/3 of the assigned NMT interventions. The assigned intervention was performed more often in the experimental arm compared with the control arm. Coaches at the high school level complied with the given protocol more than middle school coaches did. Athletes complied well with the protocol, but coaches did not, especially at the middle school level.

Patient Experiences of Recovery After Autologous Chondrocyte Implantation: A Qualitative Study.

CONTEXT: The recovery process after autologous chondrocyte implantation (ACI) can be challenging for patients and clinicians alike due to significant functional limitations and a lengthy healing time. Understanding patients' experiences during the recovery process may assist clinicians in providing more individualized care. OBJECTIVE: To explore and describe patients' experiences during the recovery process after ACI. DESIGN: Qualitative study. SETTING: Orthopaedic clinic. PATIENTS OR OTHER PARTICIPANTS: Participants from a single orthopaedic practice who had undergone ACI within the previous 12 months were purposefully selected. DATA COLLECTION AND ANALYSIS: Volunteers participated in 1-on-1 semistructured interviews to describe their recovery experiences after ACI. Data were analyzed using the process of horizontalization. RESULTS: Seven patients (2 men, 5 women; age = 40.7 ± 7.5 years, time from surgery = 8.7 ± 4.2 months) participated. Four themes and 6 subthemes emerged from the data and suggested that the recovery process is a lengthy and emotional experience. Therapy provides optimism for the future but requires a collaborative effort among the patient, surgeon, rehabilitation provider, and patient's caregiver(s). Furthermore, patients expressed frustration that their expectations for recovery did not match the reality of the process, including greater dependence on caregivers than expected. CONCLUSIONS: Patients' expectations should be elicited before surgery and managed throughout the recovery process. Providing preoperative patient and caregiver education and encouraging preoperative rehabilitation can assist in managing expectations. Establishing realistic goals and expectations may improve rehabilitation adherence, encourage optimism for recovery, and improve outcomes in the long term.