scholarly journals Radiological Evaluation of TATE Elbow Cartridge Position in Dogs

2018 ◽  
Vol 31 (06) ◽  
pp. 458-472
Author(s):  
Thomas Shaw ◽  
Toby Knowles ◽  
Neil Burton ◽  
Anna Nutt
Keyword(s):  
Elbow Flexion ◽  
Width Ratio ◽  
Component Position ◽  
Radiological Measurement ◽  
Humeral Component ◽  
Inter Observer Variability ◽  
Thoracic Limb ◽  
Alignment Angle ◽  
Elbow Replacement ◽  
Trigonometric Model

Objective The main purpose of this study was to evaluate the effect of varying elbow flexion angle and elbow orientation on the radiological measurement of component position for first (1G) and second-generation (2G) TATE elbow cartridges, and to test intra/inter-observer variability of measurements. Materials and Methods A cadaveric thoracic limb was implanted with a 1G then 2G cartridge, and mounted in lateral recumbency on an acrylic platform. The platform was tilted by set increments up to 10° in both planes, and radiographs were performed at each angle before repeating with the limb in caudocranial positioning. A deterministic trigonometric model was used to show how component angles should vary with changes in orientation, and these were compared with those measured by two observers. Humeral component angle (HCA), radioulnar component angle, varus/valgus cartridge alignment angle and the cartridge height:isthmus width ratio (CIR) were evaluated. Angles within 5° of the zero degrees inclination angle and ratios within 0.2 of the zero degrees inclination ratio were defined as acceptable. Results Observer component angles for both cartridges were accurate and precise for inclinations up to 10° except for HCA during adduction/abduction. The CIR values were within the acceptable limit for inclinations up to 7.5° in both planes. Clinical Significance Acceptable limits of limb inclination during positioning for TATE elbow replacement cartridge assessment were defined. All component measurements were sufficiently accurate and precise to be considered for evaluation of component position in clinical cases.

Cadaveric evaluation of canine arthroscopic bicipital tenotomy

2002 ◽  
Vol 15 (04) ◽  
pp. 215-222 ◽  
Author(s):  
K. S. Schulz ◽  
K. Ingel ◽  
I. G. Holsworth
Keyword(s):  
Elbow Flexion ◽  
Tendon Sheath ◽  
Anatomical Location ◽  
Anatomical Dissection ◽  
Tendon Length ◽  
Camera Port ◽  
Shoulder Joints ◽  
Biceps Tenotomy ◽  
Thoracic Limb ◽  
Distal Tendon

SummaryThe purposes of this study were to determine the optimal portal location, limb position and instrumentation for arthroscopic assisted biceps tenotomy as an alternative to open tendon transection and humeral tenodesis and to evaluate anatomical location and support of the tendon following transection.Eight canine cadaver shoulder joints underwent arthroscopic visualization of bicipital tendon length via cranio-lateral and caudo-lateral camera portals in a variety of thoracic limb positions to determine maximal tendon length visualization by anatomical marking. Comparison of tenotomy time and ease was compared between radio frequency microscalpel, blade and arthroscopic shaver. Gross anatomical dissection was performed post-tenotomy to record tendon lengths, locations and supporting structures.The cranio-lateral camera port in conjunction with combined moderate shoulder and elbow flexion optimized tendon visualization, accessible length, and instrumentation ease. Visualized tendon length varied from 39-76% of total tendon length. Tenotomy times were lowest via blade and were unable to be performed with the shaver. After tenotomy the distal tendon segment remained loosely tethered within the in- tertubercular groove at the level of the intertubercular ligament by tendon sheath and capsular attachments.Biceps tenotomy is readily performed with standard arthroscopic equipment. Appropriate limb positioning and modification of previously described portals allows maximal access. Immediately posttenotomy the distal tendon is loosely maintained within the bicipital groove by tendon sheath and capsular attachments.

scholarly journals Accuracy, Inter- and Intra-Observer Reliability of a CT Alignment Measurement Protocol for Robotic-Arm Assisted Total Knee Arthroplasty

10.29007/j8rv ◽  
2019 ◽  
Author(s):  
Jingwei Zhang ◽  
Scott Persohn ◽  
Manoshi Bhowmik-Stoker ◽  
Jason Otto ◽  
Meenakshisundaram Paramasivam ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Great Accuracy ◽  
Anatomical Landmarks ◽  
Observer Variability ◽  
Component Position ◽  
Limb Alignment ◽  
Inter Observer Variability ◽  
Measurement Protocol ◽  
Total Knee

Component position and overall limb alignment following Total Knee Arthroplasty (TKA) have been shown to influence device survivorships and clinical outcomes. However, these parameters are often assessed through 2D radiographs after surgery, which can be prone to inaccuracy. The purpose of this paper is to develop a new method for 3D CT based overall limb alignment and component position measurements. The technique utilizes a new mathematical model to calculate prosthesis alignment from the coordinates of anatomical landmarks used in RATKA. The hypothesis is that the proposed technique demonstrated good accuracy, as well as low intra and inter-observer variability.Two groups of patients (n=120 per group) underwent RATKA and conventional TKA at 4 imaging locations between October 2016 and August 2018, where they were recruited and consented for this prospective, non-randomized, multicenter study. CTs were collected 6 weeks post-operatively and analyzed using RATKA landmarks and the proposed technique. Measurements of 30 randomly selected cases were compared to the surgeons’ operative plan and component target positions for accuracy analysis. Two surgeons performed the same measurements separately for inter-observer variability analysis. One of the two surgeons repeated the measurements 30 days later to assess intra-observer variability.Average measurement error of overall limb alignment, femoral and tibial component positions were less than 1 degree. Bland Altman plots analysis showed great reproducibility between observers. Correlation analysis showed low variability within observer, with slopes between 0.8 to 1.0 and R-squared > 0.8.The proposed method demonstrated great accuracy to plan and low intra and inter-observer variability. This can be a great tool for RATKA studies where component accuracy is assessed using post-operative CTs.

Influence of Polyethylene Thickness on Axis Pin in Linked Elbow Implant

2013 ◽  
Vol 845 ◽  
pp. 194-198
Author(s):  
Milad Heidari ◽  
Muhamad Noor Harun ◽  
Ardiyansyah Syahrom
Keyword(s):  
Elbow Joint ◽  
Maximum Stress ◽  
Outer Diameter ◽  
Implant Loosening ◽  
Joint Failure ◽  
Total Elbow Replacement ◽  
Humeral Component ◽  
Elbow Replacement ◽  
Loss Of Motion ◽  
Polyethylene Thickness

Elbow joint failure results in weakness, instability, pain and loss of motion. Total Elbow replacement is last way to relief pain and instability. One of available complications after total elbow replacement is bushing wear. Excessive bushing wear may cause instability, pain and inflammatory reply to implant loosening. New prosthetic designs is probably responsible for positive changes to decrease complications. The aim of the present study was to analyze effect of ulnar bushing thickness on transmitted stress to axis pin in linked elbow implant. Axis pin, humeral/ulnar components and polyethylene bushings were modeled. All materials were assumed linear, homogenous, elastic and isotropic. A 50 N force was applied in tip of ulnar component. Distal and proximal of humeral component were fixed. Results showed maximum stress at 94 MPa for axis pin contacting ulnar bushing with 10mm outer diameter while values were 111MPa and 138MPa for ulnar bushing with 9mm and 8mm outer diameters respectively. The present study demonstrates that changing bushing thickness affects stress of axis pin.

Stable fixation of the IBP humeral component implanted without cement in total elbow replacement

2014 ◽  
Vol 96-B (2) ◽  
pp. 229-236 ◽  
Author(s):  
M. J. deVos ◽  
N. Verdonschot ◽  
J. W. H. Luites ◽  
P. G. Anderson ◽  
D. Eygendaal
Keyword(s):  
Stable Fixation ◽  
Total Elbow Replacement ◽  
Humeral Component ◽  
Elbow Replacement

Malrotation of the humeral component of the capitellocondylar total elbow replacement is not the sole cause of dislocation

1994 ◽  
Vol 12 (5) ◽  
pp. 665-671 ◽  
Author(s):  
Eiji Itoi ◽  
Graham J. W. King ◽  
Glen L. Niebur ◽  
Bernard F. Morrey ◽  
Kai-Nan An
Keyword(s):  
Total Elbow Replacement ◽  
Humeral Component ◽  
Elbow Replacement

Cervical pain and paresis of left thoracic limb in a chondrodystrophic dog.

2009 ◽  
Vol 22 (04) ◽  
pp. 294-294 ◽  
Author(s):  
Beata Degórska ◽  
Jacek Sterna ◽  
Rafal Sapierzynski ◽  
Mariusz Siedlicki
Keyword(s):  
Cervical Pain ◽  
Thoracic Limb

Analysis of human acellular nerve allograft combined with contralateral C7 nerve root transfer for restoration of shoulder abduction and elbow flexion in brachial plexus injury: a mean 4-year follow-up

2020 ◽  
Vol 132 (6) ◽  
pp. 1914-1924 ◽  
Author(s):  
Liang Li ◽  
Jiantao Yang ◽  
Bengang Qin ◽  
Honggang Wang ◽  
Yi Yang ◽  
...  
Keyword(s):  
Brachial Plexus ◽  
Nerve Root ◽  
Functional Outcomes ◽  
Elbow Flexion ◽  
Shoulder Abduction ◽  
Allograft Reconstruction ◽  
Acellular Nerve Allograft ◽  
The Mean ◽  
Monofilament Test

OBJECTIVEHuman acellular nerve allograft applications have increased in clinical practice, but no studies have quantified their influence on reconstruction outcomes for high-level, greater, and mixed nerves, especially the brachial plexus. The authors investigated the functional outcomes of human acellular nerve allograft reconstruction for nerve gaps in patients with brachial plexus injury (BPI) undergoing contralateral C7 (CC7) nerve root transfer to innervate the upper trunk, and they determined the independent predictors of recovery in shoulder abduction and elbow flexion.METHODSForty-five patients with partial or total BPI were eligible for this retrospective study after CC7 nerve root transfer to the upper trunk using human acellular nerve allografts. Deltoid and biceps muscle strength, degree of shoulder abduction and elbow flexion, Semmes-Weinstein monofilament test, and static two-point discrimination (S2PD) were examined according to the modified British Medical Research Council (mBMRC) scoring system, and disabilities of the arm, shoulder, and hand (DASH) were scored to establish the function of the affected upper limb. Meaningful recovery was defined as grades of M3–M5 or S3–S4 based on the scoring system. Subgroup analysis and univariate and multivariate logistic regression analyses were conducted to identify predictors of human acellular nerve allograft reconstruction.RESULTSThe mean follow-up duration and the mean human acellular nerve allograft length were 48.1 ± 10.1 months and 30.9 ± 5.9 mm, respectively. Deltoid and biceps muscle strength was grade M4 or M3 in 71.1% and 60.0% of patients. Patients in the following groups achieved a higher rate of meaningful recovery in deltoid and biceps strength, as well as lower DASH scores (p < 0.01): age < 20 years and age 20–29 years; allograft lengths ≤ 30 mm; and patients in whom the interval between injury and surgery was < 90 days. The meaningful sensory recovery rate was approximately 70% in the Semmes-Weinstein monofilament test and S2PD. According to univariate and multivariate logistic regression analyses, age, interval between injury and surgery, and allograft length significantly influenced functional outcomes.CONCLUSIONSHuman acellular nerve allografts offered safe reconstruction for 20- to 50-mm nerve gaps in procedures for CC7 nerve root transfer to repair the upper trunk after BPI. The group in which allograft lengths were ≤ 30 mm achieved better functional outcome than others, and the recommended length of allograft in this procedure was less than 30 mm. Age, interval between injury and surgery, and allograft length were independent predictors of functional outcomes after human acellular nerve allograft reconstruction.

A SIMPLIFIED ANALYTICAL PROCEDURE FOR SEISMIC ANALYSIS OF TIMBER LIGHT-FRAME SHEAR WALLS

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 173-180
Author(s):  
Giorgia Di Gangi ◽  
Giorgio Monti ◽  
Giuseppe Quaranta ◽  
Marco Vailati ◽  
Cristoforo Demartino
Keyword(s):  
Analytical Procedure ◽  
Seismic Analysis ◽  
Shear Walls ◽  
Element Model ◽  
Sensitivity Analyses ◽  
Width Ratio ◽  
Damping Factor ◽  
Equivalent Viscous Damping ◽  
Design Variables ◽  
Depth Analysis

The seismic performance of timber light-frame shear walls is investigated in this paper with a focus on energy dissipation and ductility ensured by sheathing-to-framing connections. An original parametric finite element model has been developed in order to perform sensitivity analyses. The model considers the design variables affecting the racking load-carrying capacity of the wall. These variables include aspect ratio (height-to-width ratio), fastener spacing, number of vertical studs and framing elements cross-section size. A failure criterion has been defined based on the observation of both the global behaviour of the wall and local behaviour of fasteners in order to identify the ultimate displacement of the wall. The equivalent viscous damping has been numerically assessed by estimating the damping factor which is in use in the capacity spectrum method. Finally, an in-depth analysis of the results obtained from the sensitivity analyses led to the development of a simplified analytical procedure which is able to predict the capacity curve of a timber light-frame shear wall.

Possibility of simultaneous transposition of segments of the pectoralis major muscle to restore flexion in the shoulder and elbow joints (clinical observation)

MedAlliance ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 61-68
Keyword(s):  
Anterior Part ◽  
Pectoralis Major Muscle ◽  
Elbow Flexion ◽  
Functional Results ◽  
Proximal Part ◽  
Deltoid Muscle ◽  
Pectoralis Major ◽  
Orthopedic Surgeons ◽  
Active Function ◽  
Head Neck

The pectoralis major is a widely used muscle in reconstruction surgery for replacement soft tissue defects of a head, neck, thorax, upper limbs and restoration of muscle active function. The peculiarities of anatomy of the pectoralis major makes it possible to divide the muscle into several segments with their own innervations and supply and use them independently from each other. This article describes the anatomy of the pectoralis major and the opportunity for clinical applications of different segments of this muscle. The authors demonstrate the result of the restoration of shoulder and elbow flexion in a patient with arthrogryposis due to simultaneous transfer of the proximal part of pectoralis major to the anterior part of the deltoid muscle and the distal part of pectoralis major to the biceps with good functional results. The article will be useful for plastic surgeons, orthopedic surgeons and physiotherapists.

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