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https://www.readbyqxmd.com/read/28743096/osteoarthritis-with-permanent-dislocation-of-the-patella-treated-by-total-knee-arthroplasty-through-a-lateral-approach-a-report-of-two-cases
#1
Shuichi Fujiwara, Takafumi Hiranaka, Yuichi Hida, Shigeru Matsuda, Harunobu Uemoto
INTRODUCTION: Permanent dislocation of the patella (PDP) is a rare condition. In cases of PDP with tibiofemoral arthritis, total knee arthroplasty may be performed through a medial parapatellar approach with patellar realignment. In this article we present two cases of PDP with tibiofemoral osteoarthritis successfully treated via lateral approach TKA without any additional realignment procedure. We performed two total knee arthroplasties for PDP with lateral tibiofemoral arthritis through a lateral approach without any realignment procedure...
July 8, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28741597/motion-compensation-for-cone-beam-ct-using-fourier-consistency-conditions
#2
Martin Berger, Yan Xia, Wolfgang Aichinger, Katrin Mentl, Mathias Unberath, Andre Aichert, Christian Riess, Joachim Hornegger, Rebecca Fahrig, Andreas Konrad Maier
In cone-beam CT, involuntary patient motion and inaccurate or irreproducible scanner motion substantially degrades image quality. To avoid artifacts this motion needs to be estimated and compensated during image reconstruction. In previous work we showed that Fourier Consistency Conditions (FCC) can be used in fan-beam CT to estimate motion in the sinogram domain. This work extends the FCC to 3-D cone-beam CT. We derive an efficient cost function to compensate for 3-D motion using 2-D detector translations...
July 25, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28733774/a-study-of-anatomy-of-distal-femur-pertaining-to-total-knee-replacement-an-analysis-conclusions-and-recommendations
#3
K Kumar, D Sharma
BACKGROUND: Multiple landmarks including the transepicondylar axis (TEA), posterior condylar axis (PCA) and anterior trochlear line (TL) have been used to set up the femoral component rotation, but each is faced with its own practical obstacle that limits its usage. Also a common practice is to set the femoral component rotation at 3° external rotation to PCA and valgus resection angle at 5°-7° to anatomical axis of femur. For the reason that the anatomy of each knee is different, it may not be justified to practice such a set protocol in all cases...
July 21, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/28723822/biomechanical-differences-in-female-basketball-and-soccer-players-during-multi-directional-jump-landings
#4
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament injury prevention programs are less successful in basketball than soccer and may be due to distinct movement strategies that these athletes develop from sport-specific training. The purpose of this study was to identify biomechanical differences between female basketball and soccer players during multi-directional jump landings. Lower extremity biomechanics of eighty-nine female athletes who played competitive basketball (n=40) or soccer (n=49) at the middle- or high-school level were analyzed with three-dimensional motion analysis during a drop vertical jump (DVJ), double- (SAG-DL) and single-leg forward jump (SAG-SL), and double- (FRONT-DL) and single-leg (FRONT-SL) lateral jump...
July 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28719477/gait-analysis-on-force-treadmill-in-children-comparison-with-results-from-ground-based-force-platforms
#5
Luigi Tesio, Chiara Malloggi, Nicola M Portinaro, Luigi Catino, Nicola Lovecchio, Viviana Rota
Gait analysis (GA) typically includes surface electromyographic (sEMG) recording from several lower limb muscles, optoelectronic measurement of joint rotations, and force recordings from ground-based platforms. From the latter two variables, the muscle power acting on the lower limb joints can be estimated. Recently, gait analysis on a split-belt force treadmill (GAFT) was validated for the study of adult walking. It showed high reliability of spatiotemporal, kinematic, dynamic, and sEMG parameters, matching those obtainable with GA on the basis of ground walking...
July 17, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28717621/effects-of-the-menstrual-cycle-on-lower-limb-biomechanics-neuromuscular-control-and-anterior-cruciate-ligament-injury-risk-a-systematic-review
#6
REVIEW
Vivek Balachandar, Jan-Luigi Marciniak, Owen Wall, Chandrika Balachandar
OBJECTIVE: Anterior cruciate ligament (ACL) injury has a devastating impact on physical and psychological disability. Rates of ACL rupture are significantly greater in females than males during the same sports. Hormonal mechanisms have been proposed but are complex and poorly understood. This systematic review evaluates the effects of menstrual cycle on: 1) lower-limb biomechanics, 2) neuromuscular control, and 3) ACL injury risk. METHODS: The MEDLINE, CINAHL, SPORTSDiscus, Web of Science, and Google Scholar databases were searched from inception to August 2016 for studies investigating the effects of the menstrual cycle on lower-limb biomechanics, neuromuscular control, and ACL injury risk in females...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28712028/internal-femoral-component-rotation-adversely-influences-load-transfer-in-total-knee-arthroplasty-a-cadaveric-navigated-study-using-the-verasense-device
#7
William A Manning, Kanishka M Ghosh, Alasdair Blain, Lee Longstaff, Steven P Rushton, David J Deehan
PURPOSE AND HYPOTHESIS: Correct femoral component rotation at knee arthroplasty influences patellar tracking and may determine function at extremes of movement. Additionally, such malrotation may deleteriously influence flexion/extension gap geometry and soft tissue balancing kinematics. Little is known about the effect of subtle rotational change upon load transfer across the tibiofemoral articulation. Our null hypothesis was that femoral component rotation would not influence load across this joint in predictable manner...
July 15, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28712025/side-to-side-asymmetries-in-landing-mechanics-from-a-drop-vertical-jump-test-are-not-related-to-asymmetries-in-knee-joint-laxity-following-anterior-cruciate-ligament-reconstruction
#8
Christophe A G Meyer, Paul Gette, Caroline Mouton, Romain Seil, Daniel Theisen
PURPOSE: Asymmetries in knee joint biomechanics and increased knee joint laxity in patients following anterior cruciate ligament reconstruction (ACLR) are considered risk factors for re-tear or early onset of osteoarthritis. Nevertheless, the relationship between these factors has not been established. The aim of the study was to compare knee mechanics during landing from a bilateral drop vertical jump in patients following ACLR and control participants and to study the relationship between side-to-side asymmetries in landing mechanics and knee joint laxity...
July 15, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28712024/knee-hyperextension-does-not-adversely-affect-dynamic-in-vivo-kinematics-after-anterior-cruciate-ligament-reconstruction
#9
Kanto Nagai, Tom Gale, Elmar Herbst, Yasutaka Tashiro, James J Irrgang, Scott Tashman, Freddie H Fu, William Anderst
PURPOSE: To evaluate the effect of knee hyperextension on dynamic in vivo kinematics after anterior cruciate ligament reconstruction (ACL-R). METHODS: Forty-two patients underwent unilateral ACL-R. Twenty-four months after surgery, subjects performed level walking and downhill running on a treadmill while dynamic stereo radiographs were acquired at 100 (walking) and 150 Hz (running). Tibiofemoral motion was determined using a validated model-based tracking process, and tibiofemoral translations/rotations were calculated...
July 15, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28707122/segond-s-fracture-a-biomechanical-cadaveric-study-using-navigation
#10
E Monaco, Daniele Mazza, A Redler, D Lupariello, R Lanzetti, M Guzzini, A Ferretti
BACKGROUND: Segond's fracture is a well-recognised radiological sign of an anterior cruciate ligament (ACL) tear. While previous studies evaluated the role of the anterolateral ligament (ALL) and complex injuries on rotational stability of the knee, there are no studies on the biomechanical effect of Segond's fracture in an ACL deficient knee. The aim of this study was to evaluate the effect of a Segond's fracture on knee rotation stability as evaluated by a navigation system in an ACL deficient knee...
July 13, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28706801/combined-anatomic-reconstruction-of-the-anterior-cruciate-and-anterolateral-ligaments-using-hamstring-graft-through-a-single-femoral-tunnel-and-with-a-single-femoral-fixation
#11
Assem Mohamed Noureldin Zein, Mohamed Ali, Hesham Ali, Ahmed Nady Saleh Elsaid, Alaa Zenhom Mahmoud, Mohamed K Osman, Amr Mohamed Mohamed Soliman
Patients with complete anterior cruciate ligament (ACL) injury have different degrees of rotational (internal rotation) laxity. A residual pivot shift has been found to be positive in more than 15% of cases after an accurate ACL reconstruction. Improved understanding of the existence, function, and biomechanical role of the anterolateral ligament (ALL) in controlling rotational instability of the knee has redirected and refocused attention on a supplemental extra-articular reconstruction of the ALL in conjunction with the intra-articular ACL reconstruction so as to restore normal kinematics of the knee...
June 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28704683/visual-targeting-one-step-before-force-plates-has-no-effect-on-gait-parameters-in-orthopaedic-patients-during-level-walking
#12
Katrin Bracht-Schweizer, Marie Freslier, Sebastian Krapf, Jacqueline Romkes
In clinical gait analysis, it is challenging to acquire usable force plate data for a patient in a limited amount of time. The aim of this study was to compare three measurement protocols, to investigate if any one of them was more time-efficient than the others at collecting kinetic data. Three conditions were compared for 15 orthopaedic patients: 1) approaching the force plate with four steps, 2) approaching the force plate with six steps, and 3) approaching the force plate with four steps while stepping on a target one step before the first force plate...
July 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28701008/asymmetric-tibial-component-improved-the-coverage-and-rotation-of-the-tibial-component-in-a-medial-pivot-total-knee-prosthesis
#13
Yukihide Minoda, Mitsuhiko Ikebuchi, Shigekazu Mizokawa, Yoichi Ohta, Hiroaki Nakamura
No abstract text is available yet for this article.
July 12, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28694684/comparison-of-joint-loading-in-badminton-lunging-between-professional-and-amateur-badminton-players
#14
Lin Fu, Feng Ren, Julien S Baker
The knee and ankle are the two most injured joints associated with the sport of badminton. This study evaluates biomechanical factors between professional and amateur badminton players using an injury mechanism model. The aim of this study was to investigate the kinematic motion and kinetic loading differences of the right knee and ankle while performing a maximal right lunge. Amateur players exhibited greater ankle range of motion (p < 0.05, r = 0.89) and inversion joint moment (p < 0.05, r = 0.54) in the frontal plane as well as greater internal joint rotation moment (p < 0...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28692451/the-value-of-musculoskeletal-ultrasound-in-geriatric-care-and-rehabilitation
#15
Büşra Can, Murat Kara, Özgür Kara, Zekeriya Ülger, Walter Frontera, Levent Özçakar
The WHO reports that one of the major chronic conditions affecting the elderly worldwide is musculoskeletal disorders that are associated with long-term pain and disability. Considering the healthcare needs of the elderly (i.e. comprehensive, accessible, efficient) and the advantages of ultrasound (US) use (patient-friendly, convenient, cost-effective, and does not require exposure to radiation or magnetic fields), there seems to be a 'gap' in the actual clinical practice. In this paper, we aimed to highlight the potential value of US imaging in the management of the elderly with a wide spectrum of musculoskeletal conditions (degenerative/rheumatic joint diseases, falls/trauma, nursing care, peripheral nerve problems, sarcopenia, and interventions)...
July 7, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28690046/kinematic-behavior-of-a-customized-surface-guided-knee-implant-during-simulated-knee-bending
#16
Shabnam Pejhan, Eric Bohm, Jan-Mels Brandt, Trevor Gascoyne, Urs Wyss
Different designs of total knee replacements (TKRs) aim to enhance the satisfaction of the patients by providing close to normal kinematics. In the surface-guided TKRs, the guidance of the motion in a normal pattern should be achieved through specially shaped articulating geometries. This study used virtual simulation along with a load-controlled knee wear simulator to evaluate the kinematic performance of a customized surface-guided TKR under weight-bearing conditions of lunging and squatting activities. The outcome pattern of TKR motion almost agreed with the predefined design target...
July 6, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28689828/influence-of-humeral-head-material-on-wear-performance-in-anatomic-shoulder-joint-arthroplasty
#17
Ulrike Mueller, Steffen Braun, Stefan Schroeder, Mark Schroeder, Robert Sonntag, Sebastian Jaeger, Jan Philippe Kretzer
BACKGROUND: The number of total shoulder arthroplasties has increased in the past years, with encouraging results. However, the survival of anatomic total shoulder arthroplasty (aTSA) is lower compared with that of knee and hip replacements. Wear-associated problems like loosening are well-known causes of long-term failure of aTSA. The main purpose of this study was to investigate the wear behavior of ceramic-polyethylene bearings compared with the standard metal-polyethylene bearings...
July 6, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28688007/how-is-patella-height-modified-after-total-knee-arthroplasty
#18
Jean Louis Prudhon, Jacques H Caton, Thierry Aslanian, Régis Verdier
INTRODUCTION: Since the first measurement method of patella height in 1929 (Janssen), more than 16 methods have been described. Most of these measures are not suitable to measure patella height after total knee arthroplasty (TKA). One of us (JC) modified the original Caton Deschamps (oCD), index with a new relative index called modified Caton Deschamps (mCD) index, by using new landmarks. The purpose of this study was to determine how patella height is modified after TKA. MATERIAL AND METHOD: Sixty primary TKAs were consecutively prospectively enrolled...
July 7, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28685303/satisfactory-knee-function-after-single-stage-posterolateral-corner-reconstruction-in-the-multi-ligament-injured-dislocated-knee-using-the-anatomic-single-graft-technique
#19
Thomas L Sanders, Nick R Johnson, Ayoosh Pareek, Aaron J Krych, Robert G Marx, Michael J Stuart, Bruce A Levy
PURPOSE: Increasing importance has been placed on the posterolateral corner (PLC) in maintaining varus and rotational stability of the knee. The goal of this study was to evaluate knee function and clinical stability following a single-graft PLC reconstruction technique and identify factors associated with poor knee function. METHODS: This study identified patients with a multi-ligament knee injury between 2006 and 2013. Patients who received a single-graft fibular collateral ligament and PLC reconstruction with a single-stage surgery during the study period and had a minimum follow-up of 2 years after surgery were included...
July 6, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28675371/proximal-femoral-derotation-osteotomy-for-idiopathic-excessive-femoral-anteversion-and-intoeing-gait
#20
Gohar Naqvi, Kuldeep Stohr, Andreas Rehm
AIM: The purpose of this study is to assess the symptoms caused by excessive femoral anteversion and the outcomes of femoral derotation osteotomy. METHODS: We reviewed data on patients who underwent proximal femoral derotation osteotomy for symptomatic intoeing gait caused by femoral anteversion. Only symptomatic patients were considered for corrective derotation osteotomy. Degree of femoral anteversion was confirmed on computed tomography (CT) scan. RESULTS: Thirty-five extremities were operated in 21 patients with an average age of 13...
2017: SICOT-J
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