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Tibialis Anterior Herniation – a Rare Clinical Entity: a Case Report And ISSN 0008-3194 (p)/ISSN 1715-6181 (e)/2020/88–91/$2.00/©JCCA 2020 Tibialis anterior herniation – a rare clinical entity: a case report and review of the literature Ali Masoumi, BSc, DC, MSc, RCCSS(C) resident1,2 Gerry Ramogida, BSc, DC1 Objectives: To present a case of a tibialis anterior Objectifs : Présenter un cas d’une hernie tibiale muscle herniation in a soccer player. antérieure chez un joueur de soccer. Clinical features: A 28-year-old male soccer player Caractéristiques cliniques : Joueur de soccer de presented with a trauma-induced injury to his right 28 ans présentant une blessure traumatique. Après anterior shin. After assessment and due to his clinical examen et en raison de ses signes et symptômes signs and symptoms, a high suspicion of tibialis anterior cliniques, on a fortement suspecté une hernie tibiale muscle herniation was suspected. antérieure. Intervention and outcomes: Diagnostic ultrasound Intervention et résultats : L’échographie a confirmé ce confirmed this diagnosis, and a trial of conservative diagnostic et un essai de traitement conservateur a été therapy was recommended. After eight weeks of recommandé. Après huit semaines de traitement, il a pu treatment, he was able to return to sport. reprendre une activité sportive. Summary: A trial of conservative treatment for the Résumé : Avant toute chirurgie, un essai de tibialis anterior muscle hernia should be included as a traitement conservateur de la hernie tibiale antérieure part of general treatment strategy prior to any surgical doit être inclus dans la stratégie générale de interventions. traitement. (JCCA. 2020;64(1):88-91) (JCCA. 2020;64(1):88-91) key words: tibialis anterior herniation, muscle mots clés : hernie tibiale antérieure, hernie herniation, soft tissue herniation, chiropractic musculaire, hernie des tissus mous, chiropratique. 1 Private practice 2 Royal College of Chiropractic Sports Sciences (Canada) Corresponding author: Ali Masoumi, 126 – 15850 26th Ave, Surrey, BC, V3Z 2N6 E-mail: [email protected] Tel: 604-721-4881 © JCCA 2020 The authors have no disclaimers, competing interests, or sources of support or funding to report in the preparation of this manuscript. The involved patient provided consent for case publication. 88 J Can Chiropr Assoc 2020; 64(1) A Masoumi, G Ramogida Introduction Muscle herniation, also known as myofascial defect, is the protrusion of a muscle through the surrounding fascia. This type of herniation, which is a relatively atypical clin- ical entity, has been rarely discussed in the dermatologic- al and musculoskeletal literature.1 The clinician’s ability to differentially diagnose and treat this type of injury from other similar looking pathologies such as lipomas, hematomas and fibromas is of great importance.2 Correct diagnosis will prevent unnecessary skin biopsy and the potential psychological side effects for patients due to a mistakenly diagnosed serious pathology. Tibialis anterior muscle herniation often presents as a distinct palpable swelling or nodule over the muscle espe- cially with weight bearing and muscle contraction.1 The swelling tends to shrink in size with muscle inactivation or when the patient is non- weightbearing or supine.3-5 Even though clinical signs and symptoms have been the gold standard for the diagnosis of this condition, the re- cent use of dynamic ultrasound for the diagnosis of dif- ferent muscle herniation has surged in popularity among 2 healthcare professionals. Figure 1. The conservative management of tibialis anterior An example of Fencer’s lunge position causing tibialis muscle herniation has not yet been discussed or researched anterior herniation. in depth. The purpose of this case report is to highlight the successful conservative management of a tibialis anterior muscle herniation. supine position. Fencer’s lunge position (Figure 1), which will increase the strain on the tibialis anterior muscle, in- Case presentation creased the localized swelling and pain. During gait an- A 28-year-old male soccer player was referred by his alysis, using a treadmill, a mild bilateral subtalar over- family physician for his persistent localized swelling and pronation during mid-stance and a five degree decrease pain over his right anterior shin of three months duration. in the ankle dorsiflexion was noted. Other orthopedic and His injury was the result of a direct trauma (slide tack- functional assessments of the lower extremity were un- ling) from the left side in a soccer match. He was unable remarkable. to continue playing due to the severity of pain. The pain Due to the high positional variability of the lesion, pre- was described as a dull, localized pain with an intensity of senting history and the absence of red flags, muscle herni- 7/10 on a Numerical Pain Rating Scale (NPRS). Weight ation was highly suspected and a diagnostic ultrasound bearing and intense physical training increased his symp- was ordered. toms. There was no numbness, tingling or weakness in the The diagnostic ultrasound confirmed a 1 cm hypoecho- lower extremities. His medical and social histories were ic lesion of the tibialis anterior muscle in the transverse unremarkable. plane, showing a loss of continuity in the surrounding Plain film imaging ordered by his family physician to fascia. Conservative management of this condition was rule out a potential fracture, and a complete neurovascular recommended to the patient with a possibility of a sur- examination were within normal limits. There was palp- gical referral if there were no significant changes in his able swelling over the belly of the tibialis anterior muscle, symptomology within a month. which would decrease in size when the patient was in a Based on the available scientific literature, conserv- J Can Chiropr Assoc 2020; 64(1) 89 Tibialis anterior herniation – a rare clinical entity: a case report and review of the literature ative treatment was limited to load modifications and Muscle hernias can be classified into traumatic and compression stockings. Due to the pathophysiology of constitutional in origin. In this case, a single slide tackle this condition, supine isometric contraction of the tibi- from the opposing player and the direct trauma to the an- alis anterior was recommend for the first two weeks, with terior shin presumably disrupted the superficial and deep eventual progression to concentric and eccentric exercis- fascia membrane surrounding the tibialis anterior muscle, es. Home stretches and mobility exercises targeting the causing localized herniation. Constitutional muscle her- ankle range of motion especially in dorsiflexion were nia origins can either be congenital or due to the increased prescribed. Custom made orthotics to alleviate the tensile intracompartmental pressure from excessive muscular load and contraction of the tibialis anterior during heel exertion and exercise.1,6,7 strike was also prescribed. Treatments for muscle herniation are controversial. After eight weeks of conservative management, his re- Asymptomatic tibialis anterior herniation typically re- ported pain intensity was substantially reduced to 1/10 on quires no specific treatment except patient assurance and the NPRS and he had a small reduction in the observed education.3 The only conservative management for pain- size of his muscle hernia. At this time, he was cleared to ful hernias cited in the literature are rest, load modifica- return to sport and to resume previous activities. A two- tion, and compression stockings.8 month follow-up after his medical release was unremark- In this case, isometric contraction of the tibialis anter- able as he continued to enjoy playing soccer with a visible ior muscle, which will decrease pain and increase motor muscle hernia, pain free. neural recruitment, was added for the first two weeks. Bement et al.11 demonstrated the analgesic effect of iso- Discussion metric contraction as they suggested that the activation Muscular hernia, which is the protrusion of the muscle of high-threshold motor units is involved in exercise-in- through its surrounding fascia, is a rare clinical finding.2 duced analgesia. These exercises were recommended in There have been about 200 cases of extremity muscle the supine position to minimize any potential intracom- herniation reported in the literature with the majority partmental pressure from weight bearing. occurring in the tibialis anterior muscle.1 The extensor Concentric contraction in supine and in weight bearing digitorum muscle of the forearm is the other common re- were recommended to the patient for the following two ported site of herniation.1 weeks, followed by eccentric exercises to generate force Due to its rare occurrence and the limited literature at greater length and to stimulate maximal tissue adap- on the topic, this condition is routinely misdiagnosed as tation to elastic force.12 The elastic energy stored during a serious pathology such as a lipoma, hematoma or fi- the lengthening phase of the eccentric contraction can be broma.2 A lack of clinical and orthopedic red flags and used during the shortening phase of muscular contraction the often traumatic nature of this condition should guide to amplify force and power production during exercise.12 the clinician away from unnecessarily procedures such as In the last stage of rehabilitation, sports-specific plyo- skin biopsy.2 metric exercises were introduced to generate multidirec- In the past, clinical findings such the appearance of tional force and stability through neural adaptation which a focal
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