RESUMEN

BACKGROUND: Load carriage tasks during United States Marine Corps (USMC) recruit training can cause injury. Load carriage conditioning, if optimized, can reduce injury risk. OBJECTIVE: To compare injuries sustained by USMC recruits following participation in either the Original Load Carriage (OLC) program or a Modified Load Carriage (MLC) program. METHODS: Retrospective musculoskeletal injury data were drawn from the USMC San Diego Sports Medicine injury database for recruits completing the OLC (n = 2,363) and MLC (n = 681) programs. Data were expressed as descriptive statistics and a population estimate of the OLC:MLC relative risk ratio (RR) was calculated. RESULTS: The proportion of injuries sustained in the MLC cohort (n = 268; 39% : OLC cohort, n = 1,372 : 58%) was lower, as was the RR (0.68, 95% CI 0.61- 0.75). The leading nature of injury for both cohorts was sprains and strains (OLC n = 396, 29%; MLC n = 66; 25%). Stress reactions were proportionally higher in MLC (n = 17, 6%; OLC n = 4, 0.3%), while stress fractures were proportionately lower (MLC n = 9, 3%; OLC n = 114, 8%). Overuse injuries were lower in MLC (- 7%). The knee, lower leg, ankle, and foot were the top four bodily sites of injuries and the Small Unit Leadership Evaluation (SULE), Crucible, overuse-nonspecific, running, and conditioning hikes were within the top five most common events causing injury. The prevalence rates of moderate severity injury were similar (MLC = 23%; OLC = 24%), although MLC presented both a higher proportion and prevalence of severe injuries (MLC = 6%; OLC = 3%, respectively). CONCLUSION: A periodized load carriage program concurrently increased exposure to load carriage hikes while reducing injuries both during the load carriage hikes and overall.

Asunto(s)

RESUMEN

ABSTRACT: Attention deficit hyperactivity disorder (ADHD) is a common condition, but current medications have limitations, pushing a drive for alternative approaches. Different exercise-focused approaches have shown promise, but concern has also been raised about individuals with ADHD showing greater risk of addiction, including exercise dependency. Using an online survey, we examined current exercise practices, including exercise dependency and the presence of overuse injury, which could result from overexercising, in 114 adults with ADHD. We found that most were regularly exercising. None were classified as exercise dependent, but 38.9% were deemed symptomatic nondependent. Hyperactive-impulsive symptoms were a predictor of the level of exercise withdrawal experienced, and the co-occurrence of autism spectrum disorder was associated with greater risk of overuse injuries. The data indicate that ADHD may confer some greater risk of exercise dependency, aligning with previous studies investigating other addictions and suggesting further research is critical.

Asunto(s)

RESUMEN

Rink Hockey is a high-speed low-contact sport with a widely recognized injury potential. Played with a hard ball by players wearing little or no protective gear, the rates of concussions and head injuries are of high interest. In this study, we reviewed and investigated injuries sustained by 108 German National League rink hockey players. We conducted an epidemiological cross-sectional study to determine sport-specific injuries and injury patterns in female and male rink hockey players. Data were collected by a standardized questionnaire. A total of 108 players participated in the study. The combined rate of injuries were 9.4/1000 athlete exposures. There was no significant difference between injury rates during games and practice. A sexspecific difference was not detected. Head injuries were the most frequent type (20.8 % of all injuries). Concussions made up 7 % of all head injuries with a rate of 0.76/1000 athlete exposure. Ball contact was the cause for 31 % of injuries, while player contact generated 26.2 % of all injuries. High rates of ball-contact-related injuries resulted in time loss and medical consultations. Head injuries were frequent, however did not result in significant time loss as compared to other injuries. The use of protective gear should be recommended.

Asunto(s)

RESUMEN

OBJECTIVE: The nociceptive pain processing of soft-tissue overuse conditions is under debate because no consensus currently exists. The purpose of this meta-analysis was to compare pressure pain thresholds (PPTs) in symptomatic and distant pain-free areas in 2 groups: participants with symptomatic lower extremity overuse soft-tissue conditions and controls who were pain free. METHODS: Five databases were searched from inception to December 1, 2021, for case-control studies comparing PPTs between individuals presenting with symptomatic lower extremity tendinopathy/overuse injury and controls who were pain free. Data extraction included population, diagnosis, sample size, outcome, type of algometer, and results. The methodological quality (Newcastle-Ottawa Quality Assessment Scale) and evidence level (Grading of Recommendations Assessment, Development, and Evaluation) were assessed. Meta-analyses of symptomatic, segmental related, and distant pain-free areas were compared. RESULTS: After screening 730 titles and abstracts, a total of 19 studies evaluating lower extremity overuse conditions (Achilles or patellar tendinopathy, greater trochanteric pain syndrome, plantar fasciitis, and iliotibial band syndrome) were included. The methodological quality ranged from fair (32%) to good (68%). Participants with lower extremity overuse injury had lower PPTs in both the painful and nonpainful areas, mirrored test-site, compared with controls (affected side: mean difference [MD] = -262.92 kPa, 95% CI = 323.78 to -202.05 kPa; nonaffected side: MD = -216.47 kPa, 95% CI = -304.99 to -127.95 kPa). Furthermore, people with plantar fasciitis showed reduced PPTs in the affected and nonaffected sides at segmental-related (MD = -176.39 kPa, 95% CI = -306.11 to -46.68 kPa) and distant pain-free (MD = -97.27 kPa, 95% CI = 133.21 to -61.33 kPa) areas compared with controls. CONCLUSION: Low- to moderate-quality evidence suggests a reduction of PPTs at the symptomatic area and a contralateral/mirror side in lower extremity tendinopathies and overuse conditions compared with pain-free controls, particularly in plantar fasciitis and greater trochanteric pain syndrome. Participants with plantar fasciitis showed a reduction of PPTs on the affected and non-affected sides at a segmental-related area (very low-quality evidence) and at a remote asymptomatic area (moderate-quality evidence). IMPACT: Some overuse peripheral pain conditions may be more associated with pressure pain sensitivity than others. Accordingly, examination and identification of conditions more peripherally, centrally, or mixed mediated could potentially lead to more specific and different treatment strategies.

Asunto(s)

RESUMEN

BACKGROUND: Limited hand function as the result of occupational exposure or accidental injury could primarily be of vascular origin. Since it is quite rarely seen in the course of routine traumatology, special awareness of this is needed. AIM OF THE PAPER: The occupational diseases hypothenar/thenar hammer syndrome (occupational disease 2114) and vibration-induced vasospastic syndrome (occupational disease 2104) are presented on the basis of their etiological and pathogenetic characteristics, taking aspects of occupational medicine and expert opinion into consideration. DISCUSSION: Blunt force trauma to vascular structures of the hand can damage the tunica intima of the affected thenar or hypothenar arteries. Chronic exposure of the arms, hands and fingers to vibration can lead to the injury of nerve and vascular structures. Thermometry and pallesthesiometry are used in the diagnostics alongside methods of vascular medicine. CONCLUSION: Vascular entities can also play a role in the surgical assessment of the impact of an accident or of an occupational disease after exposure to vibration. Awareness of them can shorten the latency between the onset of symptoms and a definitive diagnosis.

Asunto(s)

RESUMEN

A 26-year-old man presented with a 4-week history of right lower quadrant abdominal pain which was managed conservatively at home with ibuprofen. Three days later, he presented to the emergency department with worsening pain and swelling following an episode of coughing and slipping in the bathroom. Following his admission, CT angiography showed an active bleed into a 4.6×6.7×11 cm right rectus sheath haematoma, just inferior to the umbilicus. The patient was then referred to interventional radiology for an angiogram and coil embolisation. A superselective branch angiogram showed contrast extravasation from a medial branch of the right inferior epigastric artery, successfully embolised without incident.

Asunto(s)

RESUMEN

BACKGROUND: Various upper limb activities were speculated to be associated with the development of carpal tunnel syndrome (CTS). Nonetheless, there are currently no standardization on the uses of parameters in CTS assessments, nor are there any conclusive findings regarding the usefulness of various sonographic measurements in studies of different upper limb activities. In this review, we intend to evaluate the methodology of assessing CTS induced by upper limb activities with ultrasonographic technique and provide corresponding suggestions. METHODS: Clinical studies on the association between upper limb activities and prevalence of CTS using ultrasonography were recruited in a database research on the basis of a procedural selection criteria and reviewed. The following qualitative items were extracted: characteristics of studies, scanning methods, selection of sonographic parameters, and related article findings. RESULTS: Eleven studies were qualified for this review. Three studies were computer keyboard typing related, five studies were electronic device related, and three studies were wheelchair-related. All sampled articles included cross-sectional area (CSA) at the pisiform level. The swelling ratio (SR) and flattening ratio (FR) at the hamate level are also used in most studies in addition to the CSA at the pisiform level. The effectiveness of such parameters is subjected to various confounding factors such as age, weight, body mass index, and wrist anthropometrics, suggesting CSA and SR with sufficient levels had significant values as sonographic parameters. Values of parameters were found affecting symptomatic signs and hand dominance. CONCLUSION: Ultrasound scan is a suitable tool to assess the relationship between upper limb activity and CTS. CSA at the pisiform level and SR and the FR at the hamate levels are generally suitable in upper limb-associated CTS investigations. Specific study designs are required to eliminate different confounding factors accordingly.

Asunto(s)

RESUMEN

BACKGROUND: During the coronavirus disease (COVID-19) pandemic, people volunteered for sewing hand-made face masks. However, sewing-machine operating might be associated with high ergonomic risk and a negative impact on musculoskeletal health. OBJECTIVE AND METHODS: This paper describes an ultrasonographic diagnosis of a foot ganglion - after sewing 300 face masks within two months using a foot-operated sewing machine. RESULTS: The patient significantly improved after an ultrasound-guided aspiration and corticosteroid injection. CONCLUSION: In short, we highlight the importance of ultrasound examination in the management of work (overuse)-related disorders in occupational medicine practice.

Asunto(s)

RESUMEN

BACKGROUND AND HYPOTHESIS: Sport specialization is increasingly common in youth sports and is a risk factor for lower-extremity overuse injuries. However, limited data exist on whether specialization is associated with upper-extremity (UE) overuse injuries, specifically in youth baseball players. We hypothesized that specialization in baseball and being a pitcher would be associated with poorer arm health and UE overuse injury history in the previous year. METHODS: During the 2019 spring baseball season, 551 high school baseball athletes (aged 15.9 ± 1.3 years) from 3 states (Alabama, n = 200; California, n = 188; and Michigan, n = 163) completed an anonymous questionnaire. Athletes were recruited from 5 high schools in each state, with schools matched based on factors that influence specialization rates. The questionnaire consisted of (1) demographic characteristics, (2) baseball participation information (including sport specialization status), and (3) throwing-arm health and UE injury history in the previous 12 months. Throwing-arm health was assessed using the Youth Throwing Score (YTS), a validated and reliable outcome measure for youth baseball players. Multivariate regression analyses were used to examine the association between variables of interest and the YTS or UE overuse injury history, adjusting for covariates. RESULTS: After adjustment for covariates, highly specialized athletes were more likely to report a UE overuse injury in the previous year compared with low-specialization athletes (odds ratio [OR], 3.77; 95% confidence interval [CI], 1.39-10.2, P = .009). Both athletes who reported playing baseball for more than 8 months per year (OR, 2.03; 95% CI, 1.12-3.65; P = .019) and athletes who reported being a pitcher (OR, 2.11; 95% CI, 1.20-3.72; P = .010) were more likely to report a history of UE overuse injury. Highly specialized players reported lower (worse) YTS values compared with low-specialization players (least-squares mean estimate ± standard error, 56.5 ± 1.1 vs. 53.3 ± 0.7; P = .034). Players who reported pitching as one of their positions scored worse on the YTS than non-pitchers (least-squares mean estimate ± standard error, 51.6 ± 0.8 vs. 57.2 ± 0.6; P < .001). CONCLUSION: Although baseball recommendations that discourage sport specialization are widely available for parents, athletes, and coaches, high rates of sport specialization were reported in our sample. We found that being highly specialized in baseball was associated with UE overuse injury history and worse throwing-arm health in high school baseball athletes. Continued education for baseball parents, athletes, and coaches is necessary to raise awareness of the risks associated with high specialization.

Asunto(s)

RESUMEN

Tissue fibrosis is a hallmark of overuse musculoskeletal injuries and contributes to functional declines. We tested whether inhibition of CCN2 (cellular communication network factor 2, previously known as connective tissue growth factor, CTGF) using a specific antibody (termed FG-3019 or pamrevlumab) reduces established overuse-induced muscle fibrosis in a clinically relevant rodent model of upper extremity overuse injury. Young adult rats performed a high repetition high force (HRHF) reaching and lever-pulling task for 18 weeks, after first being shaped for 6 weeks to learn this operant task. Rats were then euthanized (HRHF-Untreated), or rested and treated for 6 weeks with FG-3019 (HRHF-Rest/FG-3019) or a human IgG as a vehicle control (HRHF-Rest/IgG). HRHF-Untreated and HRHF-Rest/IgG rats had higher muscle levels of several fibrosis-related proteins (TGFß1, CCN2, collagen types I and III, and FGF2), and higher muscle numbers of alpha SMA and pERK immunopositive cells, compared to control rats. Each of these fibrogenic changes was restored to control levels by the blocking of CCN2 signaling in HRHF-Rest/FG-3019 rats, as were HRHF task-induced increases in serum CCN2 and pro-collagen I intact N-terminal protein. Levels of cleaved CCN3, an antifibrotic protein, were lowered in HRHF-Untreated and HRHF-Rest/IgG rats, compared to control rats, yet elevated back to control levels in HRHF-Rest/FG-3019 rats. Significant grip strength declines observed in HRHF-Untreated and HRHF-Rest/IgG rats, were restored to control levels in HRHF-Rest/FG-3019 rats. These results are highly encouraging for use of FG-3019 for therapeutic treatment of persistent skeletal muscle fibrosis, such as those induced with chronic overuse.

Asunto(s)

RESUMEN

Paget-Schroetter Syndrome is a rare condition in the spectrum of deep vein thromboses involving spontaneous upper extremity venous thrombosis in the axillary-subclavian vein. The syndrome usually occurs in young, healthy individuals and is a progressive, anatomic manifestation of venous thoracic outlet syndrome. Thrombosis is secondary to repetitive overuse of the arm, leading to compression, microtrauma, and local inflammation of the particularly vulnerable subclavian vein in the thoracic outlet at the junction of the first rib and clavicle. The condition is often misdiagnosed because of its rarity and can lead to significant disability and morbidity if treatment is delayed. In this case report, Paget-Schroetter Syndrome, causing significant pain and dysfunction, is presented in an 18 year-old female freestyle-swimmer that was successfully treated with anticoagulation, thrombolysis, thoracic outlet decompression and first rib resection, scalenectomy, venolysis, and venoplasty. Early suspicion of this condition can lead to prompt diagnosis, and subsequent aggressive interventional treatment with catheter-directed thrombolysis and thoracic outlet decompression, in addition to anticoagulation, demonstrated success in achieving complete resolution of symptoms in this case.

Asunto(s)

RESUMEN

OBJECTIVE: The purpose of this manuscript is to analyze the evidence regarding etiopathogenesis of knee osteochondritis dissecans (OCD) lesions through a systematic review, so to summate the current understanding of the origin and progression of this pathologic articular processes. DESIGN: A systematic review of the literature was performed on the PubMed and Cochrane databases on October 2017 by 2 independent authors and included all levels of evidence. This included all English language literature, pertaining specifically to etiopathology of knee OCD with exclusions for review articles and expert opinion. Of 965 identified records, 154 full-text articles were assessed for eligibility and 86 studies met the inclusion criteria. RESULTS: According to these studies, the etiology of OCD can be of a biological or mechanical origin: 40 articles proposed a biological hypothesis, including genetic causes (27), ossification center deficit (12), and endocrine disorders (9); conversely, 52 articles supported a mechanical hypothesis, including injury/overuse (18), tibial spine impingement (5), discoid meniscus (16), and biomechanical alterations (20) as the cause of the onset of OCD. The pathogenic processes were investigated by 36 of these articles, with a focus on subchondral bone fracture and ischemia as the ultimate events leading to OCD. CONCLUSIONS: Biological and mechanical factors are found to result in subchondral bone remodeling alterations, acting independently or more likely synergically in the progression of knee OCD. The former includes genetic causes, deficit of ossification centers and endocrine disorders; the latter, tibial spine impingement, discoid meniscus, and biomechanical alterations, together with injuries and overuse. The resultant subchondral bone ischemia and/or fracturing appears to determine the onset and progression of OCD. LEVEL OF EVIDENCE: Systematic review of level II-IV studies, level IV.

Asunto(s)

Asunto(s)

RESUMEN

Plantar heel pain is often managed through podiatric and physical therapy interventions. Numerous differential diagnoses may be implicated in patients presenting with plantar heel pain; however, symptoms are often attributed to plantar fasciitis. Abductor hallucis, flexor digitorum brevis, and quadratus plantae share proximal anatomic attachment sites and mechanical function with the plantar fascia. Although these plantar intrinsic muscles each perform isolated digital actions based on fiber orientation and attachment sites, they function collectively to resist depression of the lateral and medial longitudinal arches of the foot. Overuse injury is the primary contributing factor in tendinopathy. The close anatomic proximity and mechanical function of these muscles relative to the plantar fascia suggests potential for proximal plantar intrinsic tendinopathy as a result of repetitive loading during gait and other weightbearing activities. To date, this diagnosis has not been proposed in the scientific literature. Future studies should seek to confirm or refute the existence of proximal plantar intrinsic tendinopathic changes in patients with acute and chronic plantar heel pain through diagnostic imaging studies, analysis of lactate concentration in pathologic versus nonpathologic tendons, and response to specific podiatric and physical therapy interventions germane to tendinopathy of these muscles.

Asunto(s)

RESUMEN

CONTEXT: Overtraining syndrome (OTS) and related conditions cause decreased training performance and fatigue through an imbalance among training volume, nutrition, and recovery time. No definitive biochemical markers of OTS currently exist. OBJECTIVE: To compare muscular, hormonal, and inflammatory parameters among OTS-affected athletes, healthy athletes, and sedentary controls. DESIGN: Cross-sectional study. SETTING: Laboratory. PATIENTS OR OTHER PARTICIPANTS: Fifty-one men aged 18 to 50 years (14 OTS-affected athletes [OTS group], 25 healthy athletes [ATL group], and 12 healthy sedentary participants [NCS group]), with a body mass index of 20 to 30.0 kg/m2 (sedentary) or 20 to 33.0 kg/m2 (athletes), recruited through social media. All 39 athletes performed both endurance and resistance sports. MAIN OUTCOME MEASURE(S): We measured total testosterone, estradiol, insulin-like growth factor 1, thyroid-stimulating hormone, free thyronine, total and fractioned catecholamines and metanephrines, lactate, ferritin, creatinine, creatine kinase, erythrocyte sedimentation rate, C-reactive protein, lipid profile, hemogram, and testosterone : estradiol, testosterone : cortisol, neutrophil : lymphocyte, platelet: lymphocyte, and catecholamine : metanephrine ratios. Each parameter was statistically analyzed through 3-group comparisons, and whenever P < .05, pairwise comparisons were performed (OTS × ATL, OTS × NCS, and ATL × NCS). RESULTS: Neutrophils and testosterone were lower in the OTS group than in the ATL group but similar between the OTS and NCS groups. Creatine kinase, lactate, estradiol, total catecholamines, and dopamine were higher in the OTS group than in the ATL and NCS groups, whereas the testosterone : estradiol ratio was lower, even after adjusting for all variables. Lymphocytes were lower in the ATL group than in the OTS and NCS groups. The ATL and OTS groups trained with the same intensity, frequency, and types of exercise. CONCLUSIONS: At least in males, OTS was typified by increased estradiol, decreased testosterone, overreaction of muscle tissue to physical exertion, and immune system changes, with deconditioning effects of the adaptive changes observed in healthy athletes.

Asunto(s)

RESUMEN

BACKGROUND: Heavy physical effort at work has been linked with disability pension, but the contribution of other ergonomic job exposures is less studied. We studied the independent and joint contributions of long-term exposure to (i) rotation of the back and (ii) repetitive movements to disability pension, particularly due to musculoskeletal disorders. METHODS: Exposures were measured with the Helsinki Health Study Job Exposure Matrix during 1996-2005 and linked to register data on employees of the City of Helsinki, Finland (n = 18 585). Outcomes were followed up during 2006-2015. Competing risk survival analyses were performed and synergy indices computed, adjusting for sociodemographic factors. RESULTS: Long-term exposure to rotation of the back was associated with disability pension due to any cause [age and sex-adjusted subhazard ratio (SHR) 2.39, 95% confidence interval (CI) 1.73-3.30], and specifically disability pension due to musculoskeletal disorders (SHR = 3.39, 95% CI 1.52-7.56) when compared to employees exposed to neither of the two exposures. Repetitive movements alone did not increase the risk of disability pension (all-cause SHR = 1.08, 95% CI 0.84-1.38, musculoskeletal SHR = 1.65, 95% CI 0.91-2.97). Employees with exposure to both rotation of the back and repetitive movements had the highest risk of disability pension due to musculoskeletal disorders (SHR = 5.98, 95% CI 3.85-9.28), but the interaction between exposures was additive rather than synergistic. Adjustment for education diluted the associations by 42-108%. CONCLUSION: Long-term exposure to awkward work postures increased the risk of disability pension. Educational inequalities largely account for differences in occupational exposures.

Asunto(s)

RESUMEN

Overuse myositis ossificans is considered an extremely rare diagnosis, with only a few cases reported so far. A case of a 54-year-old firefighter, involved regularly in training exercises, with bilateral myositis ossificans of the triceps, is presented. The patient had a 4 year history of painful masses at the posterior region of both arms. He never experienced any traumatic event, while physical examination revealed firm masses extending longitudinally within the lateral head of the triceps, bilaterally. The patient had painful restricted range of motion at both sides. Plain X-ray views of the humerus showed linear lobulated heterogeneous masses posterolateral. Surgical resection of both masses, which extended intramuscularly through the whole lateral triceps' head, was performed. Histological examination confirmed the diagnosis of myositis ossificans. Myositis ossificans represents a benign, relative rare clinical entity, defined as heterotopic ossification of the soft tissues. Only 5 cases of myositis ossificans due to overuse have been described so far. The present case is unique, since it is the first one describing bilateral appearance of two masses which extended through the whole length of the lateral head of the triceps. A detailed medical history, as well as imaging examination seem to be necessary in order to establish the diagnosis. Treatment should be decided upon the stage of the lesion. For mature lesions surgical treatment is advised.

Asunto(s)

RESUMEN

INTRODUCTION: Soldiers are exposed to extreme training regimens in order to optimally prepare for real battle. High attrition rates are a known issue during training courses, especially for elite troops. An underlying factor might be the disbalance between stress/strain and recovery. The aim of this review is to give insight in the current knowledge about functional overreaching (FOR), non-FOR (NFOR), and the overtraining syndrome (OTS) in the military. MATERIALS AND METHODS: A systematic literature review was conducted. PubMed, IngentaConnect, Science Direct, and Web of Science were screened for the following keywords and combinations of search terms; military, personnel, OT, soldier. RESULTS: Seven studies investigating the effects of OT during training courses were selected. The definitions used for OT varied widely and there is no systematic use of markers to determine FOR, NFOR, or the OTS in the military. CONCLUSIONS: Much research on NFOR/OTS has been conducted in the sports domain and the military could make use of these insights to promote a more efficient balance between training load and recovery. It is suggested to regularly test soldiers on physical performance, psychomotor speed and mood using ideally a military-specific test or the 1.5-mile run, psychomotor vigilance test and Profile of Mood States. The two-bout exercise test can be used as a specific test if previous testing indicates the development of NFOR/OTS and can be combined with metabolic and immunological testing to exclude pathological causes.

Asunto(s)

RESUMEN

A 26-year-old, right-handed male professional hockey player presented for a second opinion with dysesthesia of the tips of his right third, fourth, and fifth fingers after 2 previous incidents of hyperextension injuries to his right wrist while holding his hockey stick. Radiographs and computed tomography scans were negative for fracture. After magnetic resonance angiography and Doppler ultrasound imaging, the athlete was diagnosed with hypothenar hammer syndrome (HHS) with ulnar artery aneurysm and thrombosis. He underwent successful surgery with ligation and excision of the aneurysmal, thrombosed ulnar artery and was able to return to hockey 4 weeks after surgery. HHS is thought to be a rare posttraumatic digital ischemia from thrombosis and/or aneurysm of the ulnar artery and was traditionally considered an occupational injury but has been reported more frequently among athletes. There have only been 2 previous case reports of hockey players diagnosed with HHS, and in the previous 2 case reports, both involved repetitive trauma from the hockey stick, which resulted in thrombotic HHS. We present a case of a professional hockey player diagnosed with HHS also due to repetitive trauma from the hockey stick, but this time resulting in aneurysmal HHS with thromboembolism. This case report highlights the importance of keeping HHS in the differential diagnosis in athletes with pain, cold sensitivity, and paresthesia in their fingers with or without a clear history of repetitive trauma to the hypothenar eminence, as HHS is a condition with good outcomes after proper treatment.

Asunto(s)

RESUMEN

Painful and disabling musculoskeletal disorders remain prevalent. In rats trained to perform repetitive tasks leading to signs and dysfunction similar to those in humans, we tested whether manual therapy would prevent the development of the pathologies and symptoms. We collected behavioral, electrophysiological, and histological data from control rats, rats that trained for 5 weeks before performing a high-repetition high-force (HRHF) task for 3 weeks untreated, and trained rats that performed the task for 3 weeks while being treated 3x/week using modeled manual therapy (MMT) to the forearm (HRHF + MMT). The MMT included bilateral mobilization, skin rolling, and long axis stretching of the entire upper limb. High-repetition high-force rats showed decreased performance of the operant HRHF task and increased discomfort-related behaviors, starting after training. HRHF + MMT rats showed improved task performance and decreased discomfort-related behaviors compared with untreated HRHF rats. Subsets of rats were assayed for presence or absence of ongoing activity in C neurons and slow Aδ neurons in their median nerves. Neurons from HRHF rats had a heightened proportion of ongoing activity and altered conduction velocities compared with control and MMT-treated rats. Median nerve branches in HRHF rats contained increased numbers of CD68 macrophages and degraded myelin basic protein, and showed increased extraneural collagen deposition, compared with the other groups. We conclude that the performance of the task for 3 weeks leads to increased ongoing activity in nociceptors, in parallel with behavioral and histological signs of neuritis and nerve injury, and that these pathophysiologies are largely prevented by MMT.

Asunto(s)