Muscle activity during low-speed rear impact / 中华创伤杂志(英文版)

PURPOSE@#Whiplash associated disorders remain a major health problem in terms of impact on health care and on societal costs. Aetiology remains controversial including the old supposition that the cervical muscles do not play a significant role. This study examined the muscle activity from relevant muscles during rear-end impacts in an effort to gauge their influence on the aetiology of whiplash associated disorders.@*METHODS@#Volunteers were subjected to a sub-injury level of rear impact. Surface electromyography (EMG) was used to record cervical muscle activity before, during and after impact. Muscle response time and EMG signal amplitude were analysed. Head, pelvis, and T1 acceleration data were recorded.@*RESULTS@#The activities of the cervical muscles were found to be significant. The sternocleidomastoideus, trapezius and erector spinae were activated on average 59 ms, 73 ms and 84 ms after the impact stimulus, respectively, prior to peak head acceleration (113 ms).@*CONCLUSION@#The cervical muscles reacted prior to peak head acceleration, thus in time to influence whiplash biomechanics and possibly injury mechanisms. It is recommended therefore, that muscular influences be incorporated into the development of the new rear-impact crash test dummy in order to make the dummy as biofidelic as possible.

Clinical Characteristics of the Patients with Dizziness after Car Accidents / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: With increasing frequency of car accidents, patients of dizziness caused by car accidents are also increasing. Various types of dizziness or vertigo can occur from car accidents depending on different injury mechanisms. Since accurate diagnosis is important for providing proper treatments, we evaluated clinical characteristics related to vestibular function of patients with dizziness caused car accidents. SUBJECTS AND METHOD: In this retrospective case review study that runs from January 2011 to March 2013, a total of 82 patients with dizziness following car accident were enrolled consecutively. We analyzed the final diagnosis of dizziness according to different mechanisms of injury during car accident through clinical record review. Patients who developed dizziness within one month of car accident were included, excluding those who had temporal bone fracture and previous history of dizziness. RESULTS: Of the different types observed, 36.6% was head injury, 24.4% whiplash injury, 3.7% complex injury, 2.4% others and the rest was unknown. In the final diagnosis, the different types included 36.6% benign paroxysmal positional vertigo (BPPV), 23.2% unclassifiable dizziness, 18.3% cervical vertigo, 7.3% labyrinthine concussion, 3.7% BPPV with labyrinthine concussion and the rest was others. Of the different types of dizziness symptoms, 58.5% was headache, 45.1% was audiologic symptoms, and others included earfullness, tinnitus and hearing disturbance. Tinitogram and pure tone audiogram results show that 2.9% (27 people) of patients have tinnitus and 7.3% (6 people) have hearing disturbance. CONCLUSION: An accurate diagnosis and timely management would be very important in forming a proper approach for post traumatic vertigo patients.

The Effect of Soft and Rigid Cervical Collars on Head and Neck Immobilization in Healthy Subjects

STUDY DESIGN: Whiplash injury is a prevalent and often destructive injury of the cervical column, which can lead to serious neck pain. Many approaches have been suggested for the treatment of whiplash injury, including anti-inflammatory drugs, manipulation, supervised exercise, and cervical collars. Cervical collars are generally divided into two groups: soft and rigid collars. PURPOSE: The present study aimed to compare the effect of soft and rigid cervical collars on immobilizing head and neck motion. OVERVIEW OF LITERATURE: Many studies have investigated the effect of collars on neck motion. Rigid collars have been shown to provide more immobilization in the sagittal and transverse planes compared with soft collars. However, according to some studies, soft and rigid collars provide the same range of motion in the frontal plane. METHODS: Twenty-nine healthy subjects aged 18–26 participated in this study. Data were collected using a three-dimensional motion analysis system and six infrared cameras. Eight markers, weighing 4.4 g and thickened 2 cm² were used to record kinematic data. According to the normality of the data, a paired t-test was used for statistical analyses. The level of significance was set at α=0.01. RESULTS: All motion significantly decreased when subjects used soft collars (p<0.01). According to the obtained data, flexion and lateral rotation experienced the maximum (39%) and minimum (11%) immobilization in all six motions using soft collars. Rigid collars caused maximum immobilization in flexion (59%) and minimum immobilization in the lateral rotation (18%) and limited all motion much more than the soft collar. CONCLUSIONS: This study showed that different cervical collars have different effects on neck motion. Rigid and soft cervical collars used in the present study limited the neck motion in both directions. Rigid collars contributed to significantly more immobilization in all directions.

Whiplash Injury

STUDY DESIGN: Review of the literature. OBJECTIVES: To present an overview of current research on whiplash injury. SUMMARY OF LITERATURE REVIEW: There are controversies over the definition, symptoms, and treatment of whiplash injury. MATERIALS AND METHODS: Review of the relevant literature. RESULTS: Symptoms of whiplash injury caused by an acceleration-deceleration force may present as widespread pain involving the neck or trapezius muscles, the interscapular area, the shoulders and arms, or as suboccipital headaches. Accompanying symptoms may include neurologic symptoms such as sensory dysfunction, motor weakness, or deep tendon reflex loss; non-specific symptoms such as dysphagia, dizziness, visual disturbances, tinnitus, deafness, memory loss, or temporo-mandibular joint disorders; and psychological symptoms such as depression, acute stress syndrome, or fear avoidance. The most important factor that facilitates spontaneous resolution of whiplash injury, which is a self-limiting disorder, has been shown to be prevention of the acute-to-chronic pain transition. Yet in spite of this knowledge the efficacy of several treatment methods for whiplash injury remains controversial. CONCLUSIONS: The appropriateness of treatment for whiplash injury should be evaluated on the basis of up to date academic research on its diagnosis and natural history.

Usefulness of K-Point Injection for the Nonspecific Neck Pain in So-Called K-Point Syndrome

BACKGROUND: Shoichi Kokubun introduced his successful experience with local anesthetic injection at the occipital insertion of the sternocleidomastoid muscle in K-point syndrome. The purpose of this study was to evaluate the short-term and long-term effectiveness of K-point injection and investigate factors affecting treatment results. METHODS: K-point injection was performed in 58 patients with K-point syndrome at Yeungnam University Medical Center. The syndrome was associated with cervical whiplash injury in 10 patients and was of nonspecific origin in the rest. One milliliter of 2% lidocaine mixed with 1 milliliter of dexamethasone was injected in 50 patients and 2 milliliters of 1% lidocaine alone in the rest. Initially, the severity of local tenderness at the K-point and other tender points was examined and the degree of immediate pain relief effect was assessed within 1 hour after injection. Early effect within 1 month after the injection and current effect were evaluated in 27 patients using a modified Kim's questionnaire with regard to the duration of improvement, degree of improvement in pain and daily living activities, and satisfaction. RESULTS: Of the total 58 patients, 44 (75.8%) apparently had immediate pain relief after K-point injection. The only factor associated with successful immediate pain relief was the whiplash injury associated with traffic accident (TA). The early pain control effect was associated with the immediate effect. The current effect was associated with the early effect alone. Satisfaction with the K-point injection was related to early successful pain relief. CONCLUSIONS: K-point injection would be useful for early pain relief in nonspecific neck pain syndrome so called K-point syndrome, but not for current pain relief. Especially, it was very effective for early pain control in the whiplash injury associated with TA.

Epidural neuroplasty/epidural adhesiolysis

Epidural neuroplasty is a treatment modality for back pain and/or radiating pain caused by mechanical compression or neural inflammation of intra-spinal neural structures. Since epidural neuroplasty was first introduced as a treatment for pain caused by epidural adhesion such as failed back surgery syndrome (FBSS), it has been performed as a treatment for many kinds of pain of spinal origin including acute/chronic herniation of intervertebral disc, radiculopathy, spinal stenosis, FBSS, epidural adhesion, vertebral compression fracture, vertebral metastasis, resistant multilevel degenerative arthritis, epidural scar pain by infection or meningitis, and whiplash injury. Epidural neuroplasty is a catheterization technique used to treat back pain and/or radiating pain by injecting therapeutic drugs into lesions of epidural space shown as a filling defect in epidurogram. Usually, normal saline, local anesthetics, and steroid are used as therapeutic drugs. The exact mechanisms of action of the procedure are unknown but include 2 postulated mechanisms of action for pain relief. i.e., mechanical adhesiolysis by volume effect and chemical adhesiolysis by injected drugs. Relative large volumes of normal saline injection resolve adhesions and wash out accumulated pain substances; local anesthetics are used for stabilization and analgesia of flaring neural structures and for pain management for procedure related pain; and steroid is used for the treatment of inflammation of neural and peri-neural structures. The resolution of filling defect can be verified by post-procedure epidurogram. The key point of epidural neuroplasty for good results, is the exact localization of the epidural catheter into the epidural lesion.

MR investigation in evaluation of chronic whiplash alar ligament injury in elderly patients / 中南大学学报(医学版)

OBJECTIVE@#To observe the imaging features for chronic whiplash alar ligament injury in elderly patients and to provide an effective diagnostic method for long-term neck pain and headaches due to alar ligament injury in elderly patients.@*METHODS@#A total of 134 elderly patients, who engaged in the work or activities related to whiplash motion and suffered from chronic neck pain, were enrolled for the study. All patients were performed comprehensive health examination (CT, MR, ultrasound and laboratory examination) and high resolution PDWI. The patients were divided into 2 groups according to the results of comprehensive health examination: a clear etiology group(CE group, n=96) and an unknown etiology group(UE group, n=38). Th e characteristics of PDWI signal in the ligament were analyzed between the 2 groups.@*RESULTS@#Th e anatomy and signal characteristics of the alar ligament were clearly displayed by high resolution PDWI. Th e alar ligaments were effectively displayed by oblique coronal image. In the CE group, 7 patients (7/96) showed the positive sign of ligament injured, while 21 (21/38) patients showed positive sign of ligament injured in the UE group (P<0.01). Chronic whiplash ligament injury was proved to be the reason for long-term neck pain and headaches in 15.7% patients.@*CONCLUSION@#Th e whiplash injury of alar ligament is an important reason for chronic neck pain in elderly patients. High resolution PDWI is an effective method to evaluate the image features of alar ligament and can provide an accurate diagnosis for chronic neck pain and headaches caused by the alar ligament whiplash injury.

Whiplash injury analysis of cervical vertebra by finite element method / 法医学杂志

Finite element method (FEM) is an effective mathematical method for stress analysis, and has been gradually applied in the study of biomechanics of human body structures. This paper reviews the construction, development, materials assignment and verification of FEM model of cervical vertebra, and it also states the research results of injury mechanism of whiplash injury and biomechanical response analysis of the cervical vertebra using FEM by researchers at home and abroad.

Whiplash syndrome and forensic approach. A case report / Síndrome de latigazo cervical y abordaje forense: reportaje de un caso

The same day as being involved in a traffic incident as a pedestrian hit by a car, a middle-aged woman accessed emergency medical care and was later discharged. After two days the patient returned to emergency with complaints of neck pain. X-rays were conducted was immobilized with a cervical collar. Since the pain persisted, she was examined a few days later by physiatry, where a limitation in the arc of motion of the neck was found and whiplash was considered a possibility. This type of cases related to chronic posttraumatic pain are relatively common in clinical consultation and represent a great challenge for physicians, mainly in the forensic field, since there are often many symptoms and very few signs to identify the damage. Therefore, a forensic doctor must recur to the clinical history and carefully examine the mechanism of injury and the evolution of the clinical presentation, in addition to calling on other disciplines such as orthopedics, physiatry, psychiatry and pain medicine to issue a definitive concept.

Una mujer de edad mediana sufrió un accidente de tránsito como peatón al ser arrollada por un automóvil, este mismo día recibió atención mediante el servicio médico de urgencias dándosele de alta posteriormente. A los dos días la mujer consultó nuevamente el servicio de urgencias por dolor cervical, le realizaron radiografías y le inmovilizaron con cuello ortopédico. Dada la persistencia de dolor cervical, días después fue valorada por fisiatría, donde encontraron limitación para arcos de movimiento del cuello y se consideró posible síndrome de latigazo cervical. Este tipo de casos relacionados con dolor crónico postraumático es relativamente frecuente en la consulta clínica y reviste un gran reto para los médicos, principalmente en el campo forense, ya que con frecuencia hay muchos síntomas y muy pocos signos que logren objetivar el daño. De esta manera, el médico forense debe recurrir a la historia clínica y escudriñar detalladamente el mecanismo de lesión y la evolución del cuadro clínico, además de pedir el concepto de varias disciplinas como ortopedia, fisiatría, psiquiatría y medicina del dolor, para emitir su concepto definitivo.

Delayed transient post-traumatic quadriplegia

Transient neurological deficit following cervical trauma have been reported following sports injuries, and has been referred to as cervical cord neurapraxia. The so-called [whiplash injuries] following minor motor vehicle collisions usually do not produce any neurological deficit. Here we report the case of a whiplash type of injury presenting with a delayed onset neurological deficit, which was followed by rapid and complete recovery. The patient, an otherwise healthy 34-year-old male, attended the emergency department of Sultan Qaboos University Hospital following a rear-end motor vehicle collision. We present images showing degenerative disc disease causing spinal canal narrowing and mild cord compression in the patient, but no spinal instability. Differential diagnoses are also discussed

Complete Cervical Spine Fracture in Ankylosing Spondylitis Caused by Low Speed Motor Vehicle Collision

Cervical spine fracture can occur in patients with ankylosing spondylitis (AS) by even a minor trauma, which can lead to serious results. We report on the case of a 52-year-old male patient suffering from AS, who was admitted to our hospital with cardiac arrest due to fracture of the upper cervical spine without other organ injuries. A computed tomographic scan showed a cervical 2-3 level fracture and posterior dislocation of the upper cervical column. The patient was admitted to ICU, but died in hospital on day 3.

The Effectiveness of Infrared Thermography in Patients with Whiplash Injury

OBJECTIVE: This study aims to visualize the subjective symptoms before and after the treatment of whiplash injury using infrared (IR) thermography. METHODS: IR thermography was performed for 42 patients who were diagnosed with whiplash injury. There were 19 male and 23 female patients. The mean age was 43.12 years. Thermal differences (DeltaT) in the neck and shoulder and changes in the thermal differences (DeltadT) before and after treatment were analyzed. Pain after injury was evaluated using visual analogue scale (VAS) before and after treatment (DeltaVAS). The correlations between DeltadT and DeltaVAS results before and after the treatment were examined. We used Digital Infrared Thermal Imaging equipment of Dorex company for IR thermography. RESULTS: The skin temperature of the neck and shoulder immediately after injury showed 1-2degrees C hyperthermia than normal. After two weeks, the skin temperature was normal range. DeltaT after immediately injuy was higher than normal value, but it was gradually near the normal value after two weeks. DeltadT before and after treatment were statistically significant (p<0.05). VAS of the neck and shoulder significantly reduced after 2 week (p=0.001). Also, there was significant correlation between DeltadT and reduced DeltaVAS (the neck; r=0.412, p<0.007) (the shoulder; r=0.648, p<0.000). CONCLUSION: The skin temperature of sites with whiplash injury is immediately hyperthermia and gradually decreased after two weeks, finally it got close to normal temperature. These were highly correlated with reduced VAS. IR thermography can be a reliable tool to visualize the symptoms of whiplash injury and the effectiveness of treatment in clinical settings.

Distribution characteristics of meridian sinew (jingjin) syndrome in 313 cases of whiplash-associated disorders / 中国结合医学杂志

<p><b>OBJECTIVE</b>To investigate and analyze the characteristics of Meridian Sinew (Jingjin) syndrome in patients with whiplash-associated disorders (WAD).</p><p><b>METHODS</b>From August 2010 to September 2011, 313 WAD cases from New York and California states were collected. The survey mostly collects the information of "Sinew Knotted Points" and symptoms of four types of Meridian Sinew differentiation-Taiyang, Shaoyin, Shaoyang and Yangming.</p><p><b>RESULTS</b>Among the cases which are on the average of medium injury level, the higher frequency of "Sinew Knotted Points" tenderness were found on Jianwaishu (SI 14), Jianzhongshu (SI 15), Tianchuang (SI 16), C3-6 Spinous Process, Dazhui (GV 14), Fengchi (GB 20), Tianliao (SJ 15) and Tianding (LI 17). The most commonly presented symptoms were widespread spasm and tenderness in the neck (Taiyang), difficulty in lateral flexion (Shaoyang), problems of extension and flexion (Taiyang), and stiffness and pain during neck movement (Yangming). Among the cases, 237 cases (75.72%) were related to Taiyang Meridian Sinew syndrome, 82 cases (26.20%) to Shaoyin syndrome and 175 (55.91%) and 176 (56.23%) cases to Shaoyang and Yangming syndrome respectively. The most of cases presented in a combination format. The syndrome distribution under Grade I, II and III reflected that more combination of the Meridian Sinew syndromes in the whiplash injury patients which is resulted from more severity of injury.</p><p><b>CONCLUSION</b>It is practical to identify the location of abnormality through Meridian Sinew differentiation, considering both "Sinew Knotted Points" tenderness and corresponding symptoms, for the local neck symptoms of WAD.</p>

Postmortem MSCT diagnosis of whiplash injuries in a traffic accident: a case report and review of the literature / 法医学杂志

A 45-year-old male car driver died in a traffic accident of four cars rear-end collision on the highway. He was found to have died after a respiratory and cardiac arrest at the scene. No sign of skin injuries was observed from the external inspection. The autopsy was not permitted by the family members because of the local culture. Multislice computed tomography (MSCT) was applied to the current case, showing dislocation of C3-4 cervical vertebrae with II degree, C4 vertebral plate fractures, and spinal stenosis. Post-mortem MSCT confirmed the diagnosis as whiplash injuries. MSCT was verified to be effective in showing the severity of whiplash injuries, thus providing certain objective evidence for medicolegal expertise.

Altered thermal sensitivity in facial skin in chronic whiplash-associated disorders / 国际口腔科学杂志·英文版

There is a close functional relationship between the jaw and neck regions and it has been suggested that trigeminal sensory impairment can follow whiplash injury. Inclusion of manageable routines for valid assessment of the facial sensory capacity is thus needed for comprehensive evaluations of patients exposed to such trauma. The present study investigated facial thermal thresholds in patients with chronic whiplash-associated disorders (WADs) with both a qualitative method and quantitative sensory testing (QST). Ten women with pain and dysfunction following a whiplash injury were compared to 10 healthy age-matched women. Thermal detection thresholds were assessed by qualitative chair-side testing and by QST according to the method-of-limits. Seven test sites in the facial skin (overlying each trigeminal branch bilaterally, and the midpoint of the chin) were examined. The detection warm and cold thresholds were defined as the mean values of 10 individual thresholds. For the WAD patients, the qualitative assessment demonstrated both reduced and increased sensitivity compared to the healthy, whereas QST systematically showed significantly higher detection thresholds (i.e., decreased sensitivity) for both cold and warm stimuli. For the individuals who were assessed as having increased sensitivity in the qualitative assessment, the QST displayed either normal or higher thresholds, i.e., decreased sensitivity. The results suggest that QST is more sensitive for detecting thermal sensory disturbances in the face than a qualitative method. The impaired thermal sensitivity among the patients corroborates the notion of altered thermal detection capacity induced by WAD-related pain.

A Study of Impact on Head and Neck Using Human Volunteer Low-Speed Rear Impact Tests / 대한법의학회지

Whiplash injury in low-speed traffic accidents are not objectively verified by medical equipment, thereby creating scope for misuse, which has resulted in huge social losses worldwide. The aim of this study was to examine the influence of low-speed vehicular rear-impact collisions on middle-aged men, and to analyze the head and neck injury criteria for the symptomatic human volunteers. Data was examined from the results of 50 dynamic sled tests, originally performed by Hong et al. (2012). In the previous tests, 50 men aged 30~50 years were exposed to an impulse equivalent to a bumper-to-bumper rear collision under medical supervision, and no resulting whiplash injury was identified. In this study, for 6 subjects who experienced dull aches over their bodies, head injury criteria (HIC15) and neck injury criteria (N(km)) were calculated according to the accelerations, forces, and moments at the occipital condyle measured by motion capture system. Although there were no changes in magnetic resonance imaging findings in all subjects at the pre-/post-test orthopedic examination, 6 subjects revealed mild aches around the shoulder, back, or lumbar area, and their symptoms disappeared within 2 days. The head and neck injury criteria, HIC15 (3.086 +/- 2.942) and N(km) (0.077 +/- 0.064) were obtained, and the maximum HIC15 and N(km) were found to be significantly lower than the critical injury assessment reference values (HIC15: 700, N(km): 0.3). Moreover, even though 2 subjects were exposed to the same level of change of velocity (7.9 km/h), each N(km) was significantly different (0.179, 0.057). One can therefore conclude that N(km) can vary according to voluntary movements in the human subject.

Estabilização segmentar cervical: revisão da literatura / Cervical segmental stabilization: literature review

A prevalência de cervicalgia varia de 22% a 30%, indicando que 67% dos indivíduos vão sofrer de dor na cervical em alguma fase da vida. Foi realizada uma revisão de literatura sobre a estabilização cervical, comparando a eficácia do treino de flexão crâniocervical com outras técnicas. Foram pesquisados artigos científicos nas bases de dados SciELO, MEDLINE, LILACS, PubMed e Science Direct com os descritores: Cervicalgia, Atlas Cervical, Whiplash Injuries e Neck Pain no idioma inglês entre os anos 2000-2011. O treino de baixa carga de flexão crâniocervical promove uma melhor funcionalidade e redução da dor nos pacientes com disfunção na musculatura cervical.

A Case of Cervical Disc Herniation with Paresthesia in Both Arms and Tic Mimicking Motions

Intervertebral disc herniation is rare in children and is reportedly related with disc calcification and traumatic injury. We report an 8 years old girl, who complained of tingling sensation in both arms and intentional tic like neck stretching for about 1 month. She had got unnoticed whiplash Injury 2 weeks before symptoms. She also had been taking lessons for taekwondo for one and half year. Physical examination was unremarkable. Her symptoms got aggravated over the next 4 weeks. Plain vertebral x-ray showed no abnormalities, but cervical spinal MRI revealed disc central herniations at C 5-6 and C 6-7 levels. We concluded that her paresthesia and tic like motion were related with cervical disc herniation from hyperflexion neck injury.

Current study and research progress of whiplash injury of cervical vertebrae / 中国骨伤

Whiplash injury is a common injures in our daily lives, but the mechanism of it and the best treatment is largely unknown. The development of chronic pain and disability following whiplash injury is not uncommon and results in substantial social and economic costs. Clinical manifestation and recovery time are difference, which make it difficult for doctor diagnosis and treatment. The current study have shown that the social class, severity of collision, compensation and lawsuit, physical and psychological factors were relevant predictors for the outcome of whiplash. This article is try to overview the status quo of the whiplash injury.