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https://www.readbyqxmd.com/read/29780617/patellar-tracking-in-primary-total-knee-arthroplasty
#1
Simon Donell
This is a review of the recent literature of the various factors that affect patellar tracking following total knee arthroplasty (TKA).Patellar tracking principally depends on the pre-existing patellar tracking and the rotational alignment of the femoral and tibial implants, but the detailed movements depend on the patellar shape. The latter means that the patellar kinematics of any implanted TKA does not return to normal.Laboratory cadaveric studies use normal knees and non-activity-based testing conditions and so may not translate into clinical findings...
April 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29779140/knee-motion-symmetry-was-not-restored-in-patients-with-unilateral-bi-cruciate-retaining-total-knee-arthroplasty-in-vivo-three-dimensional-kinematic-analysis
#2
Paul Arauz, Yun Peng, Young-Min Kwon
PURPOSE: Although unilateral total knee arthroplasty (TKA) is successful in restoring function, there are concerns in relation to asymmetric gait patterns. Bi-cruciate retaining (BCR) TKA design preserves both anterior and posterior cruciate ligaments with the potential to restore normal joint kinematics. The purpose of this study was to investigate the in vivo three-dimensional (3D) kinematics of the knee in unilateral BCR TKA patients during gait. METHODS: Twenty-nine unilateral BCR TKA patients were evaluated for both knees during treadmill gait using a combined computer tomography and dual fluoroscopic imaging system approach...
May 19, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29778656/laxity-and-contact-forces-of-total-knee-designed-for-anatomic-motion-a-cadaveric-study
#3
Gaia Salvadore, Patrick A Meere, Matthias A Verstraete, Jan Victor, Peter S Walker
BACKGROUND: Total knee designs that attempt to reproduce more physiological knee kinematics are gaining attention given their possible improvement in functional outcomes. This study examined if a total knee designed for anatomic motion, where the soft tissue balancing was intended to replicate anatomical tibiofemoral contact forces, can more closely reproduce the laxity of the native knee. METHODS: In an ex-vivo setting, the laxity envelope of the knees from nine lower extremity specimens was measured using a rig that reproduced surgical conditions...
May 16, 2018: Knee
https://www.readbyqxmd.com/read/29778418/correlation-between-translational-and-rotational-kinematic-abnormalities-and-osteoarthritis-like-damage-in-two-in-vivo-sheep-injury-models
#4
Mehdi Shekarforoush, Jillian E Beveridge, David A Hart, Cyril B Frank, Nigel G Shrive
The relations between kinematic abnormalities and post traumatic osteoarthritis have not yet been clearly elucidated. This study was conducted to determine the finite helical axes parameters and the tibiofemoral translation vector in the knee joints of two surgically induced injury sheep models: anterior cruciate ligament and medial collateral ligament transection (ACL/MCL Tx) (n = 5) and lateral meniscectomy (n = 5). We hypothesized that morphological damage in the experimental joints would be correlated to alterations in these kinematic variables...
May 16, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29775910/hip-and-patellofemoral-joint-loading-during-gait-are-increased-in-children-with-idiopathic-torsional-deformities
#5
Elyse Passmore, H Kerr Graham, Marcus G Pandy, Morgan Sangeux
BACKGROUND: Torsional deformities of the femur and tibia are associated with gait impairments and joint pain. Several studies have investigated these gait deviations in children with cerebral palsy. However, relatively little is known about gait deviations in children with idiopathic torsion and debate ensues about the management of these patients. RESEARCH QUESTION: What are the effects of idiopathic increased femoral neck anteversion and external tibial torsion on lower-limb kinematics, kinetics and joint loading during gait in children and adolescents...
May 9, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29772993/shoulder-lesion-in-a-69-year-old-woman
#6
Andrew J Hayden, Srinivas Kolla, Adele L Boskey, Steven Burekhovich, Chuanyong Lu, Michael Stracher, Aditya V Maheshwari
Milwaukee Shoulder Syndrome (MSS) is a painful progressive arthropathy in which hydroxyapatite crystal deposition in synovial tissue induces lysosomal release of collagenase and neutral proteases. These enzymes are destructive to periarticular tissue, including the synovium, articular cartilage, rotator cuff muscles, and the intrasynovial cortical bone. MSS predominantly occurring in women (90%) over the age of 70 years of age with a clinical history marked by recurrent joint effusions and pain, which classically worsens at night...
2018: Journal of Long-term Effects of Medical Implants
https://www.readbyqxmd.com/read/29769139/double-bundle-anterior-cruciate-ligament-reconstruction-improves-tibial-rotational-instability-analysis-of-squatting-motion-using-a-2d-3d-registration-technique
#7
Kenichi Kidera, Akihiko Yonekura, Takeshi Miyaji, Yusuke Nakazoe, Kazuyoshi Gamada, Kei Yoneta, Futoshi Ikuta, Masato Tomita, Takashi Miyamoto, Shiro Kajiyama, Akira Hozumi, Ko Chiba, Narihiro Okazaki, Takayuki Shida, Makoto Osaki
BACKGROUND: The anterior cruciate ligament-deficient (ACLD) knee requires appropriate treatment for the patient to return to sports. The purpose of this study was to clarify the kinematics of the anterior cruciate ligament-deficient knee in squatting motion before and after double-bundle anterior cruciate ligament reconstruction (DB-ACLR) using a 2D/3D registration technique. METHODS: The subjects of this study were 10 men with confirmed unilateral ACL rupture who underwent DB-ACLR...
May 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29767270/no-correlation-between-rotation-of-femoral-components-in-the-transverse-plane-and-clinical-outcome-after-total-knee-arthroplasty
#8
Roland Becker, Katharina Bäker, Hagen Hommel, Manfred Bernard, Sebastian Kopf
PURPOSE: It was hypothesized that malrotation of femoral component in total knee arthroplasty (TKA) will significantly impact clinical outcome. METHODS: Eighty-eight consecutive patients with primary osteoarthritis of the knee were prospectively evaluated. They received a cemented posterior stabilized TKA (NexGen, Zimmer/Biomet® Inc., Warsaw, IN, USA). The femoral component was placed in 3° of external rotation referenced to the posterior condylar line. Postoperatively, a CT scan was performed to evaluate rotation of femoral component in the transverse plane...
May 16, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29763815/gait-pathology-subtypes-are-not-associated-with-self-reported-fall-frequency-in-children-with-cerebral-palsy
#9
Elizabeth R Boyer, Aleksys Patterson
BACKGROUND: Trips and falls are common concerns reported by parents of children with cerebral palsy. Specific gait pathologies (excessive internal hip rotation, intoeing, and stiff knee gait) are anecdotally associated with higher rates of falls. RESEARCH QUESTION: Is fall frequency higher for the aforementioned gait pathologies? METHODS: Parent-reported fall frequency from 1063 children with cerebral palsy who also had a three-dimensional gait analysis was retrospectively reviewed...
May 5, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29763812/computation-of-hip-rotation-kinematics-retrospectively-using-functional-knee-calibration-during-gait
#10
Morgan Sangeux
BACKGROUND: Hip rotation kinematics during gait is a key parameter to support clinical decision making, for example in children with lower limb torsional deformities. However, hip rotation kinematics is also one of the least repeatable parameter because it is difficult to locate the position of the medio-lateral axis of the femur. Functional knee calibration provides an alternative to locate the medio-lateral axis of the femur and may be performed retrospectively, using the movement of the knee joint during gait...
May 8, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29763429/factors-affecting-femoral-rotational-angle-based-on-the-posterior-condylar-axis-in-gap-based-navigation-assisted-total-knee-arthroplasty-for-valgus-knee
#11
Sung-Sahn Lee, Yong-In Lee, Dong-Uk Kim, Dae-Hee Lee, Young-Wan Moon
BACKGROUND: Achieving proper rotational alignment of the femoral component in total knee arthroplasty (TKA) for valgus knee is challenging because of lateral condylar hypoplasia and lateral cartilage erosion. Gap-based navigation-assisted TKA enables surgeons to determine the angle of femoral component rotation (FCR) based on the posterior condylar axis. This study evaluated the possible factors that affect the rotational alignment of the femoral component based on the posterior condylar axis...
2018: PloS One
https://www.readbyqxmd.com/read/29759125/common-soft-tissue-musculoskeletal-pain-disorders
#12
REVIEW
Matthew J Hubbard, Bernard A Hildebrand, Monica M Battafarano, Daniel F Battafarano
Soft tissue musculoskeletal pain disorders are common in the primary care setting. Early recognition and diagnosis of these syndromes minimizes patient pain and disability. This article gives a brief overview of the most common soft tissue musculoskeletal pain syndromes. The authors used a regional approach to organize the material, as providers will encounter these syndromes with complaints of pain referring to an anatomic location. The covered disorders include myofascial pain syndrome, rotator cuff tendinopathy, bicipital tendinopathy, subacromial bursitis, olecranon bursitis, epicondylitis, De Quervain disease, trigger finger, trochanteric bursitis, knee bursitis, pes anserine bursitis, Baker cyst, plantar fasciitis, and Achilles tendinopathy...
June 2018: Primary Care
https://www.readbyqxmd.com/read/29752053/anterior-laxity-lateral-tibial-slope-and-in-situ-acl-force-differentiate-knees-exhibiting-distinct-patterns-of-motion-during-a-pivoting-event-a-human-cadaveric-study
#13
Robert N Kent, Mark J Amirtharaj, Brendan M Hardy, Andrew D Pearle, Thomas L Wickiewicz, Carl W Imhauser
Knee instability following anterior cruciate ligament (ACL) rupture compromises function and increases risk of injury to the cartilage and menisci. To understand the biomechanical function of the ACL, previous studies have primarily reported the net change in tibial position in response to multiplanar torques, which generate knee instability. In contrast, we retrospectively analyzed a cohort of 13 consecutively tested cadaveric knees and found distinct motion patterns, defined as the motion of the tibia as it translates and rotates from its unloaded, initial position to its loaded, final position...
April 11, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29748070/morphometric-tibial-implant-decreases-posterior-overhang-rate-and-improves-clinical-outcomes-results-of-a-prospective-matched-controlled-study
#14
Paul Bizzozero, Yassine Bulaid, Xavier Flecher, Matthieu Ollivier, Sébastien Parratte, Jean-Noel Argenson
BACKGROUND: Tibial implant's positioning in total knee arthroplasty (TKA) requires a compromise between implant's rotation and bone coverage. We hypothesized that morphometric tibial trays (MTTs) would improve implant positioning and clinical outcomes as compared with symmetrical tibial trays. METHODS: Thirty-three patients were included prospectively according to the following criteria: age from 18 to 85 years, body mass index <35 kg/m2 , and posterostabilized cemented TKA performed for primary arthritis...
April 19, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29746554/effects-of-collagen-matrix-and-bioreactor-cultivation-on-cartilage-regeneration-of-a-full-thickness-critical-size-knee-joint-cartilage-defects-with-subchondral-bone-damage-in-a-rabbit-model
#15
Kuo-Hwa Wang, Richard Wan, Li-Hsuan Chiu, Yu-Hui Tsai, Chia-Lang Fang, John F Bowley, Kuan-Chou Chen, Hsin-Nung Shih, Wen-Fu Thomas Lai
Cartilage has limited self-repair ability. The purpose of this study was to investigate the effects of different species of collagen-engineered neocartilage for the treatment of critical-size defects in the articular joint in a rabbit model. Type II and I collagen obtained from rabbits and rats was mixed to form a scaffold. The type II/I collagen scaffold was then mixed with rabbit chondrocytes to biofabricate neocartilage constructs using a rotating cell culture system [three-dimensional (3D)-bioreactor]. The rabbit chondrocytes were mixed with rabbit collagen scaffold and rat collagen scaffold to form neoRBT (neo-rabbit cartilage) and neoRAT (neo-rat cartilage) constructs, respectively...
2018: PloS One
https://www.readbyqxmd.com/read/29741957/effects-of-proud-large-osteochondral-plugs-on-contact-forces-and-knee-kinematics-a-robotic-study
#16
Peter Z Du, Keith L Markolf, Daniel V Boguszewski, Kent T Yamaguchi, Christopher J Lama, David R McAllister, Kristofer J Jones
BACKGROUND: Osteochondral allograft (OCA) transplantation is used to treat large focal femoral condylar articular cartilage defects. A proud plug could affect graft survival by altering contact forces (CFs) and knee kinematics. HYPOTHESIS: A proud OCA plug will significantly increase CF and significantly alter knee kinematics throughout controlled knee flexion. STUDY DESIGN: Controlled laboratory study. METHODS: Human cadaver knees had miniature load cells, each with a 20-mm-diameter cylinder of native bone/cartilage attached at its exact anatomic position, installed in both femoral condyles at standardized locations representative of clinical defects...
May 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29739631/morphological-patterns-of-anterior-femoral-condylar-resection-in-kinematically-and-mechanically-aligned-total-knee-arthroplasty
#17
Jung-Taek Kim, Jun Han, Quan Hu Shen, Sung Won Moon, Ye-Yeon Won
BACKGROUND: "Grand-piano sign" has been used as a popular benchmark to facilitate correct rotational alignment during total knee arthroplasty (TKA). The purpose was to quantitatively determine morphological patterns on anterior femoral resection in mechanically aligned (MA) and kinematically aligned (KA) TKA. METHODS: Computed tomography scans of 60 TKA candidates were reconstructed into 3D models. Femurs were virtually cut with a 3D imaging program using various anterior flange flexion angles (AFFAs) of 3°, 5°, and 7°...
April 9, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29738557/hand-reach-star-excursion-balance-test-an-alternative-test-for-dynamic-postural-control-and-functional-mobility
#18
Ola Eriksrud, Peter Federolf, Patrick Anderson, Jan Cabri
Tests of dynamic postural control eliciting full-body three-dimensional joint movements in a systematic manner are scarce. The well-established star excursion balance test (SEBT) elicits primarily three-dimensional lower extremity joint movements with minimal trunk and no upper extremity joint movements. In response to these shortcomings we created the hand reach star excursion balance test (HSEBT) based on the SEBT reach directions. The aims of the current study were to 1) compare HSEBT and SEBT measurements, 2) compare joint movements elicited by the HSEBT to both SEBT joint movements and normative range of motion values published in the literature...
2018: PloS One
https://www.readbyqxmd.com/read/29732661/wear-properties-of-poly-ether-ether-ketone-bearing-combinations-under-zero-and-cross-shear-kinematics-in-total-knee-arthroplasty
#19
Kathryn A Chamberlain, Kenneth S Rankin, Adam Briscoe, David Deehan, Philip J Hyde
Poly-ether-ether-ketone (PEEK), having shown favorable biocompatibility in spinal applications is being considered as an alternative biomaterial in orthopaedics, either as part of an all-polymer bearing couple, or a replacement for the metallic component in hard-on-soft bearings. Throughout the literature ultra-high molecular weight polyethylene exhibits a range of wear behavior dependent upon the amount of cross shear (CS) present in the bearing motion; in comparison, the behavior of PEEK bearing combinations subject to cross shear conditions is less understood...
May 7, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29721837/change-of-direction-biomechanics-is-what-s-best-for-anterior-cruciate-ligament-injury-prevention-also-best-for-performance
#20
REVIEW
Aaron S Fox
Change-of-direction maneuvers (e.g., side-step cutting) are an important aspect of performance in multi-directional sports, but these maneuvers are also associated with anterior cruciate ligament (ACL) injury. Despite this, the impact of biomechanics on ACL injury risk and performance is often examined in isolation. The purpose of this review was to examine the alignment between biomechanical recommendations for ACL injury prevention and performance with regard to change-of-direction maneuvers. Several studies linking change-of-direction biomechanics to both ACL injury risk and performance were examined...
May 2, 2018: Sports Medicine
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