scholarly journals Arthroscopic Characterization of Syndesmotic Instability

2018 ◽  
Vol 3 (2) ◽  
pp. 2473011418S0000
Author(s):  
Mohamed Abdelaziz ◽  
Jafet Massri-Pugin ◽  
Bart Lubberts ◽  
Bryan Vopat ◽  
Daniel Guss ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Stress Test ◽  
Ankle Arthroscopy ◽  
Coronal Plane ◽  
Ligament Injury ◽  
Deltoid Ligament ◽  
Interosseous Ligament ◽  
P Values ◽  
Intact State ◽  
Lateral Incision

Category: Arthroscopy, Sports, Trauma, Other, Syndesmosis Introduction/Purpose: Ankle arthroscopy is increasingly used to diagnose syndesmostic instability by visualizing the distal tibiofibular articulation and applying a lateral fibular stress. Precisely where in the incisura one should measure potential diastasis, however, remains unclear. The purpose of this study was to determine where within the incisura one should assess coronal plane instability in purely ligamentous syndesmotic injuries when performing a lateral hook stress test (LHT). Methods: Twenty-two above-knee cadaveric specimens underwent ankle arthroscopy, first with intact ligaments and thereafter after each sequential step of syndesmotic and deltoid ligament transection. At each step, a standard 100 N hook test was applied through a lateral incision 5 cm proximal to the ankle joint and the coronal plane diastasis in the stressed and unstressed states were measured at both anterior and posterior third of the distal tibiofibular joint using calibrated probes ranged from 0.1 to 6.0 mm, with 0.1 mm of increments. Results: Anterior third diastasis did not change significantly when applying a LHT, neither in the intact state nor after any stage of ligament transection (P values ranging from p=0.61 to p=0.94). In contrast, posterior third diastasis increased significantly by applying stress at the intact state at the following stages of transection: posterior-inferior tibiofibular ligament (PITFL), PITFL plus interosseous ligament, all syndesmosis ligaments, and all syndesmosis ligaments plus superficial and deep deltoid ligament (P values ranging p=0.001 to p=0.031). Interobserver agreement was substantial (ICC = 0.81; 95% confidence interval, 0.44-0.92), and moderate (ICC = 0.73; 95% confidence interval, 0.36-0.87) for anterior and posterior third diastasis measurements, respectively. Conclusion: Syndesmotic ligament injury results in coronal plane instability of the distal tibiofibular articulation that is readily identified arthroscopically with a LHT and when measured in the posterior third of the incisura. Measurement at the anterior third of the incisura may miss such injuries.

Role of the Deltoid Ligament in Syndesmotic Instability

2018 ◽  
Vol 39 (5) ◽  
pp. 598-603 ◽  
Author(s):  
Jafet Massri-Pugin ◽  
Bart Lubberts ◽  
Bryan G. Vopat ◽  
Jonathon C. Wolf ◽  
Christopher W. DiGiovanni ◽  
...  
Keyword(s):  
Lateral Force ◽  
Coronal Plane ◽  
Deltoid Ligament ◽  
Lateral Stress ◽  
Interosseous Ligament ◽  
Intact State ◽  
Tibiofibular Ligament ◽  
Anterior Inferior Tibiofibular Ligament ◽  
Cadaveric Model

Background: The deltoid ligament (DL) is the principal ligamentous stabilizer of the medial ankle joint. Little is known, however, about the contribution of the DL toward stabilizing the syndesmosis. The aim of this study was to arthroscopically evaluate whether the DL contributes to syndesmotic stability in the coronal plane. Methods: Eight above-knee cadaveric specimens were used in this study. A lateral hook test was performed by applying 100 N of lateral force to the fibula in the intact state and after sequential transection of the DL, anterior-inferior tibiofibular ligament (AITFL), interosseous ligament (IOL), and posterior-inferior tibiofibular ligament (PITFL). At each stage, distal tibiofibular diastasis was measured arthroscopically at both the anterior and posterior third of the incisura and compared to stress measurements of the intact syndesmosis. Measurements were performed using probes ranging from 0.1 to 6.0 mm, with 0.1-mm increments. Results: There was no significant increase in diastasis at either the anterior or posterior third of the tibiofibular articulation after isolated DL disruption, nor when combined with AITFL transection. In contrast, a significant increase in diastasis was observed following additional disruption of the IOL (anterior and posterior third diastasis, P= .012 and .026, respectively), and after transection of all 3 syndesmotic ligaments (anterior and posterior third diastasis, P=.001 and .001, respectively). Conclusion: When evaluating the syndesmosis arthroscopically in a cadaveric model under lateral stress, neither isolated disruption of the DL nor combined DL and AITFL injuries destabilized the syndesmosis in the coronal plane. In contrast, the syndesmosis became unstable if the DL was injured in conjunction with partial syndesmotic disruption that included the AITFL and IOL. Clinical relevance: Disruption of the DL appeared to destabilize the syndesmosis in the coronal plane when associated with partial disruption of the syndesmosis (AITFL and IOL).

Arthroscopic Assessment of Syndesmotic Instability in the Sagittal Plane in a Cadaveric Model

2019 ◽  
Vol 41 (2) ◽  
pp. 237-243 ◽  
Author(s):  
Bart Lubberts ◽  
Jafet Massri-Pugin ◽  
Daniel Guss ◽  
Jonathon C. Wolf ◽  
Rohan Bhimani ◽  
...  
Keyword(s):  
Sagittal Plane ◽  
Cutoff Point ◽  
Ligament Injury ◽  
Deltoid Ligament ◽  
Optimal Cutoff ◽  
Distal Fibula ◽  
Interosseous Ligament ◽  
Tibiofibular Ligament ◽  
Optimal Cutoff Point ◽  
Cadaveric Model

Background: Syndesmotic instability is multidirectional, occurring in the coronal, sagittal, and rotational planes. Despite the multitude of studies examining such instability in the coronal plane, other studies have highlighted that syndesmotic instability may instead be more evident in the sagittal plane. The aim of this study was to arthroscopically assess the degree of syndesmotic ligamentous injury necessary to precipitate fibular translation in the sagittal plane. Methods: Twenty-one above-knee cadaveric specimens underwent arthroscopic evaluation of the syndesmosis, first with all syndesmotic and ankle ligaments intact and subsequently with sequential sectioning of the anterior inferior tibiofibular ligament (AITFL), the interosseous ligament (IOL), the posterior inferior tibiofibular ligament (PITFL), and deltoid ligament (DL). In all scenarios, an anterior to posterior (AP) and a posterior to anterior (PA) fibular translation test were performed under a 100-N applied force. AP and PA sagittal plane translation of the distal fibula relative to the fixed tibial incisura was arthroscopically measured. Results: Compared with the intact ligamentous state, there was no difference in sagittal fibular translation when only 1 or 2 ligaments were transected. After transection of all the syndesmotic ligaments (AITFL, IOL, and PITFL) or after partial transection of the syndesmotic ligaments (AITFL, IOL) alongside the DL, fibular translation in the sagittal plane significantly increased as compared with the intact state ( P values ranging from .041 to <.001). The optimal cutoff point to distinguish stable from unstable injuries was equal to 2 mm of fibular translation for the total sum of AP and PA translation (sensitivity 77.5%; specificity 88.9%). Conclusion: Syndesmotic instability appears in the sagittal plane after injury to all 3 syndesmotic ligaments or after partial syndesmotic injury with concomitant deltoid ligament injury in this cadaveric model. The optimal cutoff point to arthroscopically distinguish stable from unstable injuries was 2 mm of total fibular translation. Clinical Relevance: These data can help surgeons arthroscopically distinguish between stable syndesmotic injuries and unstable ones that require syndesmotic stabilization.

scholarly journals Peritalar Kinematic Changes Associated with Increased Spring Ligament Tear in Cadaveric Flatfoot Model

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0032 ◽  
Author(s):  
Ashlee MacDonald ◽  
David Cifo ◽  
Emma Knapp ◽  
Hani Awad ◽  
John Ketz ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Coronal Plane ◽  
Abduction Angle ◽  
Deltoid Ligament ◽  
Interosseous Ligament ◽  
Ligament Tear ◽  
Spring Ligament ◽  
Valgus Angle ◽  
Valgus Alignment ◽  
Tear Size

Category: Hindfoot Introduction/Purpose: Adult Acquired Flatfoot Deformity (AAFD) is a complex and progressive deformity characterized by abduction of the midfoot and valgus alignment of the hindfoot. Spring ligament tear is often present in advanced stages of the AAFD. Previous anatomic studies have demonstrated that the superficial deltoid ligament blends with the superomedial spring ligament to provide both medial tibiotalar and talonavicular stability aiding in coronal plane stability. Given that the spring ligament blends with the superficial deltoid ligament, we sought to investigate the kinematic effect of spring ligament tear in development of peritalar instability in cadaveric flatfoot model. We hypothesized that increased spring ligament tear size will result in increased talonavicular joint abduction (axial) and plantarflexion (sagittal), and increased valgus alignment of the tibiotalar and subtalar joints (coronal). Methods: Seven fresh-frozen cadaveric foot specimens were employed. Reflective markers were mounted on the tibia, talus, navicula, calcaneus and the first metatarsus. Kinematics of the peritalar joints were captured by multiple camera motion capture system. A flatfoot model was created by sectioning the medial and inferior talonavicular interosseous ligament, followed by cyclic axial load of 1150 N under a hydraulic loading frame with 350 N load applied to the Achilles tendon. The talo-first metatarsus (T- 1MT) abduction angle was calculated and cycles were applied until abduction of 5-10° (mild flatfoot) was achieved. Spring ligament sectioning was extended 1 cm proximally along the superomedial ligament followed by cyclic loading until 10-15° (moderate) of T- 1MT abduction was achieved. The spring ligament was sectioned for another 1 cm followed by cyclic loading until >15° (severe) abduction was noted. The relative kinematic changes were compared among the initial, mild, moderate, and severe flatfoot model using two-way ANOVA. Results: The average T-1MT abduction angles in the mild, moderate, and severe flatfoot were 7.79°+/-2.27°, 11.47°+/-2.82°, and 15.46°+4.15°. Meary’s angle increased with progression of the flatfoot (mild 6.17°+/-2.92°, moderate 9.71°+/-3.4°, severe 12.46°+/-4.13°). Hindfoot valgus angle also increased. The mild, moderate, and severe flatfoot showed 2.4°+/-3.85°, 4.13°+/-3.9°, and 4.75°+/-3.79° of tibiotalar valgus angle. The subtalar joint exhibited 2.94°+/-3.41°, 5.52°+/-4.34°, and 6.97°+/-4.83° valgus angle in the mild, moderate, and severe models. The T-1MT abduction angle and Meary’s angle were significantly different in all flatfoot models compared to the initial condition (p<0.001), and the severe vs. mild models (p<0.01). Tibiotalar valgus was significantly increased in severe compared to the initial model (p=0.02). Subtalar valgus angle significantly increased in the moderate and severe models compared to the initial (p<0.01, p<0.001). Conclusion: Serial increment in spring ligament tear size in simulated flatfoot increased relative talus adduction and plantarflexion. It also resulted in gradual increment of valgus alignment of the tibiotalar and subtalar joints in coronal plane. This finding demonstrates that a large spring ligament tear in advanced stage AAFD leads to increased strain across the medial peritalar ligaments. In addition to osseous correction and tendon transfer, medial ligament augmentation, may be a critical component in surgical correction of AAFD with a large spring ligament tear.

Do Coronal or Sagittal Plane Measurements Have the Highest Accuracy to Arthroscopically Diagnose Syndesmotic Instability?

2021 ◽  
pp. 107110072110041
Author(s):  
Rohan Bhimani ◽  
Bart Lubberts ◽  
Pongpanot Sornsakrin ◽  
Jafet Massri-Pugin ◽  
Gregory Waryasz ◽  
...  
Keyword(s):  
Operating Characteristic ◽  
Sagittal Plane ◽  
Area Under The Curve ◽  
Coronal Plane ◽  
Deltoid Ligament ◽  
Roc Curve Analysis ◽  
Level Of Evidence ◽  
Interosseous Ligament ◽  
Tibiofibular Ligament ◽  
Anterior Inferior Tibiofibular Ligament

Background: To compare the accuracy of arthroscopic sagittal versus coronal plane distal tibiofibular motion toward diagnosing syndesmotic instability. Methods: Arthroscopic assessment of the syndesmosis was performed on 21 above-knee cadaveric specimens, first with all ligaments intact and subsequently with sequential transection of the anterior inferior tibiofibular ligament, the interosseous ligament, the posterior inferior tibiofibular ligament, and the deltoid ligament. A lateral hook test, an anterior-to-posterior (AP) translation test, and a posterior-to-anterior (PA) translation test were performed under 100 N of applied force. Anterior and posterior third coronal plane diastasis and AP and PA sagittal plane fibular translations were measured relative to the static tibia. Results: Receiver operating characteristic (ROC) curve analysis revealed that the area under the curve (AUC) was higher for the combined AP and PA sagittal measurements (AUC, 0.91; accuracy, 83.5%; sensitivity, 78%; specificity, 89%) than the coronal plane measurements (anterior third: AUC, 0.65; accuracy, 60.5%; sensitivity, 63%; specificity, 59%; posterior third: AUC, 0.73; accuracy, 68.5%; sensitivity, 80%; specificity, 57%) ( P < .001), underscoring the higher accuracy of sagittal plane measurements. Conclusion: Arthroscopic measurement of sagittal plane fibular translation is more accurate than coronal plane diastasis for evaluating syndesmotic instability. Clinical Relevance: Clinicians should focus on distal tibiofibular motion in the sagittal plane when arthroscopically evaluating suspected syndesmotic instability. Level of Evidence: Biomechanical cadaveric study.

scholarly journals A mouse model of ankle-subtalar joint complex instability induced post-traumatic osteoarthritis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Peixin Liu ◽  
Kaiwen Chen ◽  
Shuo Wang ◽  
Chunzhuo Hua ◽  
Hongtao Zhang ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Subtalar Joint ◽  
Sham Group ◽  
Step Length ◽  
Ligament Injury ◽  
Deltoid Ligament ◽  
Balance Beam ◽  
Post Traumatic ◽  
Time Required ◽  
The Right

Abstract Background Ankle-subtalar joint complex instability is not uncommonly presented in the clinic, but symptoms and signs similar to other conditions can easily lead to its misdiagnosis. Due to the lack of appropriate animal models, research on ankle-subtalar joint complex instability is limited. The aims of the present study were to establish an animal model of ankle-subtalar joint complex instability in mice and to explore its relationship with post-traumatic osteoarthritis (PTOA). Methods Twenty-one male C57BL/6J mice were randomly divided into three groups: SHAM group (sham surgery group), transected cervical ligament + anterior talofibular ligament (CL+ATFL) group, and transected cervical ligament + deltoid ligament (CL+DL) group. Two weeks after surgery, all mice underwent cage running training. Balance beam and gait tests were used to evaluate the changes in self-movement in the mice after ankle-subtalar ligament injury. Micro-CT and histological staining were used to evaluate the progress of PTOA. Results Compared with the SHAM group, balance and gait were affected in the ligament transection group. Twelve weeks after surgery, the time required to cross the balance beam in the CL+ATFL group was 35.1% longer and the mice slipped 3.6-fold more often than before surgery, and the mean step length on the right side was 7.2% smaller than that in the SHAM group. The time required to cross the balance beam in the CL+DL group was 32.1% longer and the mice slipped 3-fold more often than prior to surgery, and the average step length on the right side was 5.6% smaller than that in the SHAM group. CT images indicated that 28.6% of the mice in the CL+DL group displayed dislocation of the talus. Tissue staining suggested that articular cartilage degeneration occurred in mice with ligament transection 12 weeks after surgery. Conclusions Transected mice in the CL+ATFL and CL+DL groups displayed mechanical instability of the ankle-subtalar joint complex, and some mice in the CL+DL group also suffered from talus dislocation due to ligament injury leading to loss of stability of the bone structure. In addition, as time progressed, the articular cartilage displayed degenerative changes, which affected the ability of animals to move normally.

Abstract 13468: The Interaction Between the Prognostic Value of Chronotropic Incompetence and Cardiorespiratory Fitness: The Henry Ford Exercise Testing (FIT) Project

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Waqas T Qureshi ◽  
Wesley T O'Neal ◽  
Clinton A Brawner ◽  
Jonathan K Ehrman ◽  
Steven J Keteyian ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Regression Model ◽  
Cardiorespiratory Fitness ◽  
Cox Regression ◽  
Stress Test ◽  
Exercise Stress ◽  
Chronotropic Incompetence ◽  
Metabolic Equivalents ◽  
Social Security Death Index ◽  
All Cause Mortality

Background: Cardiorespiratory fitness (CRF) and chronotropic incompetence (CI) have both been associated with increased all - cause mortality. We tested the hypothesis that the association of CI with all - cause mortality is modified by a CRF level above and below 10 metabolic equivalents of task (METs). Methods: We included 43,402 patients who completed a clinical exercise stress test between 1991 and 2009. Patients on AV nodal blocking agents, antiarrhythmics and with known coronary artery disease/heart failure were excluded. Patients were followed-up for a mean duration of 11.5±5.2 years for all-cause mortality ascertained by a search of the social security death index in April 2013. CRF was estimated in metabolic equivalents of task (METs). Cox proportional hazards regression models were used to assess the risk of all - cause mortality associated with CI with adjustments for confounders. Results: Compared to no CI, patients with CI were older (51±12 vs. 54±13 years), less often white (68% vs. 58%), dyslipidemic (41% vs. 37%) and more likely to be hypertensive (46% vs. 60%), diabetic (15% vs. 22%), and smoke (40% vs. 51%). On average, patients with CI had lower CRF (9.8±2.8 vs. 7.4±3.0, p <.001). In adjusted Cox regression model, CI was associated with higher risk of mortality [Hazard ratio (HR), 2.12; 95% confidence interval (2.00 -2.27); p<.001)]. The association of CI and mortality was attenuated when METs was included as a covariate in the regression model [HR, 1.49; 95% confidence interval (1.39-1.61); p<.001]. There was a significant interaction of CRF ≥ 10 METs with the association of CI and mortality (p interaction 0.004) which is shown in Figure 1. This was a subaditive and multiplicative interaction of CRF with CI. Conclusions: This study demonstrates that CRF attenuates the mortality risk associated with CI. In addition, patients with CI in the presence of CRF ≥ 10 METs have a much lower risk than patients with CI and lower CRF.

Varus External Rotation Stress Test for Radiographic Detection of Deep Deltoid Ligament Disruption With and Without Syndesmotic Disruption

2013 ◽  
Vol 34 (2) ◽  
pp. 251-260 ◽  
Author(s):  
John E. Femino ◽  
Tanawat Vaseenon ◽  
Phinit Phistkul ◽  
Yuki Tochigi ◽  
Donald D. Anderson ◽  
...  
Keyword(s):  
External Rotation ◽  
Stress Test ◽  
Deltoid Ligament ◽  
Ligament Disruption ◽  
Rotation Stress

Correlating Arthroscopic and Radiographic Findings of Deep Deltoid Ligament Injuries in Rotational Ankle Fractures

2020 ◽  
pp. 107110072096279
Author(s):  
D’Ann Arthur ◽  
Casey Pyle ◽  
Stephen J. Shymon ◽  
David Lee ◽  
Thomas Harris
Keyword(s):  
External Rotation ◽  
Open Reduction Internal Fixation ◽  
Ankle Fractures ◽  
Ligament Injury ◽  
Deltoid Ligament ◽  
Posterior Tibial Tendon ◽  
Level Of Evidence ◽  
Radiographic Findings ◽  
Type Iv ◽  
Retrospective Comparative Study

Background: The deep deltoid ligament (DDL) is a key stabilizer to the medial ankle and ankle mortise and can be disrupted in ligamentous supination external rotation type IV (LSER4) ankle fractures. The purpose of this study was to define the medial clear space (MCS) measurement on injury mortise radiographs that corresponds with complete DDL injury. Methods: A retrospective record review at a level 1 hospital was performed identifying patients with LSER4 ankle fractures who underwent arthroscopy and open reduction internal fixation. Chart reviews provided arthroscopic images and operative reports. Complete DDL injury was defined as arthroscopic visualization of the posterior tibial tendon (PTT). Inability to completely visualize the PTT was defined as a partial DDL injury. MCS was measured on injury mortise radiographs. Eighteen subjects met inclusion criteria. Results: Twelve subjects had complete and 6 subjects had partial DDL injury based on arthroscopic findings. Patients with complete DDL injury and those with partial DDL injury had injury radiograph MCS ranging from 5.5 to 29.9 mm and 4.0 to 5.0 mm, respectively. All patients with MCS ≥5.5 mm on injury radiographs had complete DDL injury and all patients with MCS ≤5.0 mm on injury radiographs had partial DDL injury. Conclusion: Complete DDL injury was found on injury ankle mortise radiographs as MCS widening of ≥5.5 mm, which correlated with arthroscopic visualization of the PTT. Using this cutoff, surgeons can surmise the presence of a complete deltoid ligament injury, allowing for improved preoperative planning. Level of Evidence: Level III, retrospective comparative study.

scholarly journals Prevalence of vulvovaginitis and bacterial vaginosis in patients with koilocytosis

2008 ◽  
Vol 126 (6) ◽  
pp. 333-336 ◽  
Author(s):  
Ana Claudia Camargo Campos ◽  
Ruffo Freitas-Junior ◽  
Luiz Fernando Jubé Ribeiro ◽  
Régis Resende Paulinelli ◽  
Cleomenes Reis
Keyword(s):  
Confidence Interval ◽  
Bacterial Vaginosis ◽  
Odds Ratio ◽  
Bacterial Colonization ◽  
Univariate Analysis ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
P Values ◽  
The City

CONTEXT AND OBJECTIVE: Empirical discussion regarding an association between koilocytosis and vulvovaginitis often occurs. Thus, the objective of this study was to assess the prevalence of microorganisms associated with bacterial vaginosis and vulvovaginitis in women with and without koilocytosis. DESIGN AND SETTING: Analytical cross-sectional study including two cohorts of women (with and without koilocytosis) who attended a cancer hospital in the city of Goiânia, state of Goiás. METHODS: A total of 102 patients entered the study. The whiff test, Gram and Papanicolaou staining and bacterial and fungal culturing were performed. The results were observed using univariate analysis. The odds ratio and confidence interval (CI) of the variables were calculated; P-values < 0.05 were considered significant. RESULTS: The prevalence of bacterial colonization was similar in patients with and without koilocytosis. The odds ratio for candidiasis was 1.43 (CI 1.05-1.95) and the odds ratio for trichomoniasis was 1.78 (CI 1.49-2.12), in patients with koilocytosis. CONCLUSIONS: The prevalence of candidiasis and trichomoniasis seems to be higher in patients with koilocytosis.

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