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Article

Physical Function in Amateur Athletes with Lumbar Disc Herniation and Chronic Low Back Pain: A Case-Control Study

by
Diego Miñambres-Martín
1,2,
Patricia Martín-Casas
3,4,
Ibai López-de-Uralde-Villanueva
3,4,
César Fernández-de-las-Peñas
5,6,
Juan Antonio Valera-Calero
7,* and
Gustavo Plaza-Manzano
3,4
1
Premium Madrid Global Health Care, 28016 Madrid, Spain
2
Faculty of Sport Sciences, Universidad Europea de Madrid, 28670 Villaviciosa de Odón, Spain
3
Department of Radiology, Rehabilitation and Physiotherapy, Universidad Complutense de Madrid, 28040 Madrid, Spain
4
Instituto de Investigación Sanitaria San Carlos (IdISSC), 28040 Madrid, Spain
5
Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, 28922 Alcorcón, Spain
6
Cátedra Institucional en Docencia, Clínica e Investigación en Fisioterapia: Terapia Manual, Punción Seca y Ejercicio Terapéutico, Universidad Rey Juan Carlos, 28922 Alcorcón, Spain
7
VALTRADOFI Research Group, Department of Physiotherapy, Faculty of Health, Universidad Camilo José Cela, 28692 Villanueva de la Cañada, Spain
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2022, 19(6), 3743; https://doi.org/10.3390/ijerph19063743
Submission received: 2 February 2022 / Revised: 11 March 2022 / Accepted: 18 March 2022 / Published: 21 March 2022
(This article belongs to the Special Issue Prevalence, Evaluation and Management of Chronic Spinal Pain and Musculoskeletal Disorders)
Versions Notes

Abstract

:
This study aimed to analyze if chronic low back pain (LBP) and lumbar disc herniation induce biomechanics, flexibility, body balance, physical activity, and muscular function alterations compared to a similar asymptomatic cohort. Fifty male volunteers (n = 25 with chronic LBP and lumbar disc herniation and n = 25 pain-free subjects) were enrolled. Range of motion (internal and external hip rotation, ankle dorsiflexion, and active straight leg raise, ASLR), trunk flexibility (finger–floor distance), body balance (Y-balance test) and muscle function (Biering–Sorensen test, prone and lateral bridges) outcomes were assessed. Comparative analyses between sides and group were conducted. Results: Patients showed greater weight and BMI compared with controls (p < 0.05). None of the outcomes bilaterally assessed showed side-to-side differences for pain-free participants (all, p > 0.05) or LBP patients (all, p > 0.05). Regarding the differences between groups, LBP patients showed limited internal hip rotation (p < 0.001), finger–floor distance (p < 0.001), body balance (p < 0.001), and muscle endurance (planks p < 0.001; Biering–Sorensen test p < 0.05). External hip rotation, ASLR, and ankle dorsiflexion range of movement were comparable in both groups (p > 0.05). The sample of pain-free amateur athletes showed greater range of movement for internal hip rotation, lower finger–floor distance, better body balance, and muscle function. However, the external hip rotation, ankle dorsiflexion, and ASLR tests showed no difference between cases and controls.

1. Introduction

Low back pain (LBP) is the most common musculoskeletal condition, affecting up to the 18.3% of the entire population with a lifetime prevalence of >80%, and is considered the largest contributor to years lived with disability by the Global Burden of Disease [1,2,3]. As the estimated cost per LBP episode and patient was estimated at EUR > 2750 considering direct and indirect costs (i.e., pharmaceuticals, surgical and non-surgical inpatient cares, medical visits, rehabilitation, and work absence), LBP represents a major health problem [4].
Since mechanical LBP refers to pain that arises intrinsically from spinal structures (e.g., intervertebral discs, sacroiliac joints, facet joints, bones, nerve roots, and muscles), different clinical classifications for LBP have been proposed, including lumbosacral muscle strain, disk herniation, lumbar spondylosis, spondylolisthesis, vertebral compression fractures, and traumatic injuries [5]. In patients with chronic low back pain, an estimated 39% of cases could be attributed to the intervertebral disk infection, torsion, or internal disk disruption even if not all degenerated or herniated disks are painful [6].
Functional testing is an essential procedure during the clinical evaluation, as the primary reason LBP populations seek medical care is difficulty performing regular functional activities [7]. In fact, some associations between mobility, strength and endurance of the trunk, balance, and sociodemographic features with future LBP have been found [8].
Although numerous previous studies have found significant associations between LBP and decreased ankle dorsiflexion [9], lumbar instability [10], hip range of movement [11], trunk flexibility [12], body balance [13], and function of lumbopelvic muscles [14], there is limited evidence comparing all these features in amateur athletes with disk herniation and chronic low back pain compared with a similar pain-free cohort. The rationale for this study was based on (1) the high LBP prevalence in amateur athletes (LBP point prevalence up to 67%, one-year prevalence up to 94%, and lifetime prevalence up to 84%, depending on the sport performance) [15] and (2) the lack of studies assessing functional and clinical testing in amateur athletes.
Therefore, the purpose of this study is to compare physical function factors considered to be associated with LBP (i.e., biomechanics, flexibility, body balance, physical activity, and muscular function) among the general population in one sample of amateur athletes with lumbar disk herniation and chronic low back pain with one sample of asymptomatic amateur athletes.

2. Materials and Methods

2.1. Study Design

An observational case–control study was conducted to compare the physical function among amateur athletes with chronic LBP and lumbar disk herniation and asymptomatic amateur athletes. This study followed the Strengthening the Reporting of Observational studies in Epidemiology (STROBE) guidelines and checklist for case–control studies [16]. Thus, the study design considered all the recommendations stated in the Declaration of Helsinki and approved by the local Clinical Ethics Committee of Hospital Clínico San Carlos (ID: 19/044-E_Tesis). All participants signed a written informed consent prior to their inclusion. Demographic data including age, gender, height, weight, and body mass index (BMI), and number of LBP episodes during the last 12 months were collected in a standard self-reported history template.

2.2. Participants

Two consecutive samples of individuals were recruited and screened for potential eligibility in a tertiary physical therapy clinic in Madrid (Spain) from September 2019 to March 2020. Local announcements were posted to inform potential participants during the recruitment stage. General inclusion criteria applicable for both samples were (1) adults aged ranging 25 to 55 years, since this is the peak range of lumbar disk herniation prevalence [17], and (2) rutinary physical activity performance (150 min/week at moderate intensity, 75 min/week at vigorous intensity, or equivalent combination of both). Exclusion criteria included (1) traumatic injury or surgery located in the lumbar spine or lower limbs during the last year; (2) local conditions affecting the functional tests performance; (3) subjects needing foot orthose; (4) upper or lower limbs asymmetries; (5) peripheral or central neuropathies; (6) cognitive, psychological, or psychiatric conditions; (7) any other inflammatory or malignancy medical condition.
Specific criteria for cases were (1) at least one relevant episode of LBP during the last year, (2) with a duration under 3 months, (3) without neurological signs, and (4) imaging confirmation of lumbar disk herniation. Controls had to confirm absence of LBP during the last year to be included in the study.

2.3. Clinical Severity Assessment

2.3.1. Pain Intensity

Participants with chronic LBP and disc herniation were asked to rate, on a 11-point numerical point rate scale (NPRS), their mean pain intensity experienced during the last LBP episode. In this scale, 0 was interpreted as “complete absence of pain” and 10 as “the worst imaginable pain” [18].

2.3.2. Low Back Pain Disability

In order to quantify the disability caused by LBP, participants were asked to complete the Oswestry Low Back Pain Disability Questionnaire (ODI). This self-reported questionnaire demonstrates acceptable reproducibility [19] and consists of a 10-item battery and responses in a 6-point Likert scale where 0 is considered “complete absence of disability” and 5 “maximum disability”. Final scores are expressed as a percentage and results from multiplying the test score times two. Participants’ disability is considered as minimal, moderate, severe, crippled, or complete if final results range from 0–20%, 21–40%, 41–60%, 61–80%, and 81–100%, respectively [20].

2.4. Physical Function Assessment

2.4.1. Biomechanics

Passive ankle dorsiflexion was measured following the procedure described by Konor et al. and using a digital inclinometer as recommended [21]. Participants were placed in the standing position (allowing the contact with the wall using two fingers to ensure the balance) with the heel in contact with the ground, the knee in line with the second toe and the great toe 10 cm away from the wall. Then, participants were asked to lunge forward, directing their knees toward the wall until their knees touched the wall keeping the heel in the ground. This procedure was repeated, gliding the foot back (at a rate of 1 cm at a time) until finding the last point the participant could touch the wall with the knee. To obtain the range of movement (ROM), a digital inclinometer was placed at the anterior tuberosity of the tibia to measure the relative angle of the tibia to the ground.
In addition, internal and external passive hip rotation were assessed bilaterally using a digital inclinometer. Participants were placed in the prone position, knee flexed to 90° and pelvis stabilized using a belt. To improve the accuracy of measurements, a mean average of three trials was calculated for each movement and side, and finally analyzed [22].

2.4.2. Flexibility

Lower limb and trunk flexibility were assessed using the ASLR and finger–floor distance, respectively. Participants were placed in a supine position with hips and knees extended at rest and feet 20 cm apart. A digital inclinometer was placed at the anterior tuberosity of the tibia. During the test, the examiner passively lifted the leg up, keeping the knee extension until the participant’s limit (defined and trained as first appearance of discomfort) to obtain the ROM [23].
Finger–floor distance was measured with participants in the standing position, hips in neutral rotation, knees extended, and feet separated 20 cm apart. Then, participants were asked to perform a maximum trunk flexion avoiding the knee flexion, keeping both hands touching and fingers extended. To obtain the score, the examiner measured the distance between the floor and the distal extreme of the third finger with a metric line [24].

2.4.3. Physical Activity

Rutinary physical activity was measured using the Global Physical Activity Questionnaire (GPAQ) since it is considered as a reliable, valid, and adaptable self-reported questionnaire across all populations. This questionnaire consists of 16 questions within three domains: occupational, transport-related, and leisure-time physical activity that lasts for at least 10 min with the moderate and vigorous intensity [25].

2.4.4. Balance

Balance was assessed using the Y-balance test. To complete the test, participants were standing at the center of a Y, with the hands in contact with the hips, and reached with the contralateral leg as far as possible along one of the three directions (anterior, posteromedial, and posterolateral) not touching the floor while maintaining a single-leg squat stance. Participants trained the test three times with a 30” period of resting to avoid fatigue before obtaining the score. The test was considered failed if the participant touched the ground with the foot during the maneuver, lost the balance, lost the contact of the hands with the hips, or glided the stance foot [26].

2.4.5. Function of Trunk Muscles

Muscle function was assessed using the prone and lateral bridges and the Biering–Sorensen test. The prone and lateral bridge consists of the amount of time a participant can maintain a prone bridge (plank) and a side bridge (plank) on their feet, aligning shoulders, pelvis, and toes before losing the alignment [27].
Finally, the Biering–Sorensen test challenges the erector spinal endurance, assessing the amount of time a participant can keep the unsupported upper part of the body (from the iliac crest) horizontal while placed prone with the buttocks and legs fixed to a table and the arms across the chest until the participants lose control of the posture [28].

2.5. Statistical Analysis

Statistical analyses were performed with the SPSS V.25 software for Mac OS (IBM, Armonk, NY, USA). Normal distribution of the data was verified using the Shapiro–Wilk test. Sociodemographic, clinical, and functional characteristics were calculated by total sample, by sex and group (cases and controls). A two-way Analysis of Variance (ANOVA) with side as within-group factor (for bilaterally assessed variables) and group as between-group factor was used to determine side-to-side and between-group differences, respectively. All tests were two-tailed, with p-values < 0.05 considered significant.

3. Results

From 57 subjects who responded to the announcement, seven participants were excluded (1) from the control group because they reported history of LBP during within the last 6 months (n = 4), and (2) from the LBP group since they did not have imaging confirmation of disc herniation (n = 3). Therefore, fifty participants (n = 25 patients with chronic LBP and lumbar disc herniation and n = 25 pain-free controls, all males) were finally included.
Sociodemographic and clinical characteristics from both samples are described in Table 1. Between-sex differences could not be analyzed since all participants were males. Regarding the comparison between both samples, significant differences were found for weight and BMI (both, p < 0.05). In addition, pain-free subjects showed to be more active than patients (greater vigorous activity and less sitting time, both p < 0.001).
Range of movement and flexibility data are summarized in Table 2. None of the outcomes bilaterally assessed showed side-to-side differences for pain-free participants (all, p > 0.05) or LBP patients (all, p > 0.05). However, LBP patients showed significant internal hip rotation limitation compared to asymptomatic subjects (p < 0.001). External hip rotation, ASLR, and ankle dorsiflexion range of movement were comparable in both groups (p > 0.05). Finger–floor distance was significantly greater in patients with LBP (p < 0.001).
Balance scores by group and side are reported in Table 3. Asymptomatic and LBP populations showed no side-to-side differences for the Y-balance test (total score and all individual axes, p > 0.05). Although the anterior axis showed no differences between LBP and pain-free samples (p > 0.05), pain-free subjects resulted in greater scores in both posterior axes (posteromedial p < 0.001; posterolateral p < 0.01) and the total score (p < 0.001).
Finally, in Table 4, data regarding the muscular function in both samples are available. During the lateral bridge, both samples obtained comparable timings for the left and the right side (p > 0.05). However, prone and lateral bridge timings were significantly larger in the asymptomatic sample compared to the LBP group (both, p < 0.001). Regarding the Biering–Sorensen test, the pain-free group held the posture control significantly longer than LBP group (p < 0.05).

4. Discussion

Although this is not the first study investigating functional differences between patients with chronic LBP and lumbar disc herniation and asymptomatic subjects, to our knowledge, no previous reports are available assessing these differences in amateur athletes. In general, we found no side-to-side differences for bilaterally assessed tests in both the clinical and asymptomatic groups. Regarding the between-groups differences, pain-free subjects demonstrated better muscle function in all the tests (prone and lateral bridges and Biering–Sorensen test) and balance (except Y-balance test scores in the anteroposterior axis), even if disability scores and pain intensity of the symptomatic subjects were fair. However, not all the range of movement and flexibility tests showed relevant differences. For instance, ankle dorsiflexion, the ASLR test, and external hip rotation scores were comparable between groups. Both internal hip rotation and finger–floor distance were clinically relevant to distinguish clinical and asymptomatic subjects.
Measuring the range of motion is a common clinical practice aiming at identifying dysfunctional patterns and comparing the patients’ evolution [29]. A previous systematic review reported that general LBP populations are characterized by decreased ROM compared to asymptomatic subjects. In addition, normative lumbar ROM scores for asymptomatic subjects are reported. However, these scores showed wide ranges due to variations between studies (i.e., including biological conditions, measuring instruments, and positions) and the clinical relevance is limited [30].
Regarding the hip joint, the reduced hip extension in patients with LBP and compensatory lumbar spine rotation during hip movements are consistent in the literature [31,32,33,34]. Thus, this hip extension limitation is directly associated with greater hip extension asymmetry, pain intensity, and disability in general LBP populations. In accordance with our findings, internal hip rotation is reduced in amateur golfers with LBP, professional tennis players, and sedentary subjects compared to asymptomatic controls [33]. However, we did not find asymmetric range of motion as did Kim et al. [33]. This inconsistence can be explained by the fact that we did not focus on specific sport performance, and the asymmetric nature of some sports (e.g., golf or tennis) with repeated pivoting movements (e.g., tennis and golf) causing high torsional forces on the lead hip could be the main reason for asymmetric hip range of motion.
The utility of the ASLR remains controversial since its diagnostic accuracy for identifying sciatica showed a 36–79% sensitivity and 37–74% specificity and, therefore, there is low level of evidence supporting the use of ASLR [35]. Accordingly, we found no differences between groups or sides.
On the other hand, our results showed relevant finger–floor distance differences between both groups. Similarly, a previous study conducted a cluster of eight signs (including this test in the battery) for diagnosing lumbosacral nerve root compression, demonstrating acceptable sensitivity (72%) and specificity (80%) [36].
In this study, we found LBP patients to obtain poorer balance scores compared with pain-free subjects, especially in the posterolateral and posteromedial directions. Similarly, Ganesh et al. [37] obtained similar conclusions, as LBP subjects reached shorter distances than asymptomatic subjects. However, our results cannot be compared, since sociodemographic characteristics of the participants are not described in the study conducted by Ganesh et al. [37].
Greater muscle function was found in pain-free controls compared with LBP patients. Emphasizing core endurance is essential, as poor endurance and motor control strategies have been widely associated with LBP [38,39]. In contrast to the conclusions made by Pitcher et al. [40], where the Biering–Sorensen test is not conclusive enough to differentiate between controls and subjects with varying degrees of mild back disability based on the Oswestry classification, we found significant differences between amateur athletes with mild disability and asymptomatic athletes. However, these tests are highly demanding, and better-tolerated alternatives (i.e., isometric and dynamic exercises such as squat or bird-dog exercises) should be considered during rehabilitative exercise programs [41].

Limitations

Some potential limitations should be recognized for the current study. Given that only men were included, these findings may not be applicable to women with this condition. In addition, as asymptomatic volunteers were not required to present any imaging test, we cannot confirm the absence of lumbar disc herniation or any other radiological finding for this group. Finally, the sample size of this study was too small to be able to extrapolate our findings to the general population. Further research increasing the sample size would increase the statistical power of the study to corroborate/deny our findings. Despite these potential limitations, current findings could assist clinicians targeting therapies for future clinical intervention trials in individuals with lumbar disc herniation and chronic low back pain.

5. Conclusions

Although our sample of amateur athletes with lumbar disc herniation and chronic LBP showed mild disability and pain, several functional differences with pain-free controls were found. The sample of asymptomatic subjects showed greater range of movement for internal hip rotation, lower finger–floor distance, better balance, and muscle function. However, the external hip rotation, ankle dorsiflexion, and ASLR tests showed no difference between cases and controls.

Author Contributions

Conceptualization, methodology, software, validation, formal analysis, investigation, resources, data curation: D.M.-M., P.M.-C., I.L.-d.-U.-V., C.F.-d.-l.-P., J.A.V.-C. and G.P.-M.; writing—original draft preparation: J.A.V.-C.; writing—review and editing, visualization: D.M.-M., P.M.-C., I.L.-d.-U.-V., C.F.-d.-l.-P., J.A.V.-C. and G.P.-M.; supervision: G.P.-M.; project administration: D.M.-M.; funding acquisition: N/A. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Clinical Ethics Committee of Hospital Clínico San Carlos (ID: 19/044).

Informed Consent Statement

Informed consent was obtained from all subjects involved in the study.

Data Availability Statement

All data derived from this study are presented in the text.

Conflicts of Interest

The authors declare no conflict of interest.

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Table
Table 1. Baseline characteristics of the sample by group.
Table 1. Baseline characteristics of the sample by group.
Total Sample (n = 50)LBP Group (n = 25)Pain-Free Group (n = 25)
Socio-demographic characteristics
Gender (n, H/M)50/025/025/0
Age (years)37.1 ± 6.638.3 ± 7.935.9 ± 4.8
Height (meters)1.75 ± 0.071.76 ± 0.081.75 ± 0.05
Weight (kg) *75.9 ± 11.979.2 ± 14.472.6 ± 7.8
BMI (kg/m2) *24.4 ± 2.525.2 ± 2.823.6 ± 1.8
Clinical Characteristics
NPRS (0–100) 3.8 ± 3.8N/A
LBP Episodes (n) a 2.0 ± 2.11N/A
ODI (0–100) 6.3 ± 8.7N/A
Physical Activity
Vigorous Activity—Sports (METS) †1826.4 ± 486.01320.0 ± 382.22332.8 ± 385.1
Moderate Activity—Sports (METS)609.6 ± 161.5751.2 ± 192.9468.0 ± 173.2
+10 Walking (METS)416.4 ± 112.7393.6 ± 104.7439.2 ± 109.3
Sitting time (hours/day) †9.14 ± 3.7011.4 ± 2.26.8 ± 3.4
Values are expressed as mean ± SD. a Number of LBP episodes within the last year. * Significant differences between case and control groups (p < 0.05). † Significant differences between case and control groups (p < 0.001).
Table
Table 2. Participants’ characteristics at baseline.
Table 2. Participants’ characteristics at baseline.
Internal Hip
Rotation (°)		External Hip
Rotation (°)		ASLR (°)Ankle Dorsiflexion (°)Finger–Floor Distance (cm)
LBP Group (n = 25)
Mean14.2 ± 4.327.3 ± 7.158.1 ± 9.842.8 ± 9.68.8 ± 9.9
Left side13.8 ± 4.527.2 ± 5.858.4 ± 9.341.1 ± 8.1
Right side14.5 ± 4.227.3 ± 6.457.7 ± 10.440.8 ± 7.2
Between-side differences0.6 (−1.8; 3.1)0.0 (−3.6; 3.7)0.7 (−1.8; 3.2)0.3 (−4.0; 4.7)
Pain-free Group (n = 25)
Mean17.3 ± 5.927.1 ± 5.360.8 ± 9.042.8 ± 9.6−0.6 ± 6.22
Left side16.9 ± 6.227.6 ± 5.660.6 ± 8.742.5 ± 8.7
Right side17.7 ± 5.726.7 ± 4.961.1 ± 9.443.2 ± 10.7
Between-side Difference0.8 (−2.6; 4.2)0.9 (−2.1; 3.9)0.5 (−4.7; 5.7)0.6 (−4.9; 6.2)
Between-Group Differences
Mean3.1 (−1.0; 5.2) *0.1 (−2.2; 2.4)2.7 (−6.5; 0.9)1.8 (−1.5; 5.3)9.4 (4.6; 14.1) *
* Statistically significant differences (p < 0.001).
Table
Table 3. Participants characteristics at baseline.
Table 3. Participants characteristics at baseline.
Y-Balance Test
Total Score (°)		Y-Balance Test
Anterior Axis (°)		Y-Balance Test
Posteromedial Axis (°)		Y-Balance Test
Posterolateral Axis (°)
LBP Group (n = 25)
Mean184.6 ± 25.054.4 ± 6.462.1 ± 11.168.0 ± 11.7
Left side185.4 ± 25.554.4 ± 6.563.2 ± 10.567.8 ± 12.0
Right side183.8 ± 25.454.4 ± 6.561.0 ± 11.868.3 ± 11.6
Between-side differences1.5 (−12.8; 15.9)0.0 (−3.6; 3.7)2.1 (−4.2; 8.5)0.6 (−6.1; 7.3)
Pain-free Group (n = 25)
Mean200.2 ± 18.055.8 ± 5.470.5 ± 7.973.8 ± 8.4
Left side199.0 ± 18.655.7 ± 5.769.2 ± 8.374.0 ± 8.2
Right side201.4 ± 17.755.8 ± 5.371.9 ± 7.473.6 ± 8.7
Between-side Difference 2.4 (−7.9; 12.8) 0.0 (−3.1; 3.2)2.7 (−1.8; 7.2)0.4 (−4.4; 5.2)
Between-Group Differences
Mean15.5 (6.8; 24.2) †1.3 (−1.0; 3.7)8.4 (4.5; 12.2) †5.7 (1.7; 9.8) *
* p < 0.01; † p < 0.001.
Table
Table 4. Physical function characteristics: muscle function.
Table 4. Physical function characteristics: muscle function.
LBP Group
(n = 25)		Pain-Free Group
(n = 25)		Between-Groups
Differences
Prone Bridge (s)25.9 ± 8.638.7 ± 14.412.8 (6.0; 17.0) †
Lateral Bridge (s)
Mean19.4 ± 6.427.1 ± 9.77.7 (4.4; 11.0) †
Left side19.0 ± 5.726.0 ± 8.9
Right side19.8 ± 7.128.3 ± 10.4
Between-sides Difference0.7 (−3.0; 4.4)2.2 (−3.2; 7.8)
Biering-Sorensen Test (s)29.1 ± 17.537.3 ± 13.18.2 (0.5; 17.0) *
* p <0.05; † p < 0.001.
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Miñambres-Martín, D.; Martín-Casas, P.; López-de-Uralde-Villanueva, I.; Fernández-de-las-Peñas, C.; Valera-Calero, J.A.; Plaza-Manzano, G. Physical Function in Amateur Athletes with Lumbar Disc Herniation and Chronic Low Back Pain: A Case-Control Study. Int. J. Environ. Res. Public Health 2022, 19, 3743. https://doi.org/10.3390/ijerph19063743

AMA Style

Miñambres-Martín D, Martín-Casas P, López-de-Uralde-Villanueva I, Fernández-de-las-Peñas C, Valera-Calero JA, Plaza-Manzano G. Physical Function in Amateur Athletes with Lumbar Disc Herniation and Chronic Low Back Pain: A Case-Control Study. International Journal of Environmental Research and Public Health. 2022; 19(6):3743. https://doi.org/10.3390/ijerph19063743

Chicago/Turabian Style

Miñambres-Martín, Diego, Patricia Martín-Casas, Ibai López-de-Uralde-Villanueva, César Fernández-de-las-Peñas, Juan Antonio Valera-Calero, and Gustavo Plaza-Manzano. 2022. "Physical Function in Amateur Athletes with Lumbar Disc Herniation and Chronic Low Back Pain: A Case-Control Study" International Journal of Environmental Research and Public Health 19, no. 6: 3743. https://doi.org/10.3390/ijerph19063743

APA Style

Miñambres-Martín, D., Martín-Casas, P., López-de-Uralde-Villanueva, I., Fernández-de-las-Peñas, C., Valera-Calero, J. A., & Plaza-Manzano, G. (2022). Physical Function in Amateur Athletes with Lumbar Disc Herniation and Chronic Low Back Pain: A Case-Control Study. International Journal of Environmental Research and Public Health, 19(6), 3743. https://doi.org/10.3390/ijerph19063743

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