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Patellofemoral joint

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https://www.readbyqxmd.com/read/28532476/effects-of-osteochondral-defect-size-on-cartilage-regeneration-using-a-double-network-hydrogel
#1
Kotaro Higa, Nobuto Kitamura, Keiko Goto, Takayuki Kurokawa, Jian Ping Gong, Fuminori Kanaya, Kazunori Yasuda
BACKGROUND: There has been increased interest in one-step cell-free procedures to avoid the problems related to cell manipulation and its inherent disadvantages. We have studied the chondrogenic induction ability of a PAMPS/PDMAAm double-network (DN) gel and found it to induce chondrogenesis in animal osteochondral defect models. The purpose of this study was to investigate whether the healing process and the degree of cartilage regeneration induced by the cell-free method using DN gel are influenced by the size of osteochondral defects...
May 22, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28528349/high-wear-resistance-of-femoral-components-coated-with-titanium-nitride-a-retrieval-analysis
#2
Christian Fabry, Carmen Zietz, Axel Baumann, Reinhard Ehall, Rainer Bader
PURPOSE: The objective of this study was to evaluate the in vivo wear resistance of cobalt-chromium femoral components coated with titanium nitride (TiN). Our null hypothesis was that the surface damage and the thickness of the TiN coating do not correlate with the time in vivo. METHODS: Twenty-five TiN-coated bicondylar femoral retrievals with a mean implantation period of 30.7 ± 11.7 months were subjected to an objective surface damage analysis with a semi-quantitative assessment method...
May 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28522245/pin-site-complications-associated-with-computer-assisted-navigation-in-hip-and-knee-arthroplasty
#3
Eli Kamara, Zachary P Berliner, Matthew S Hepinstall, H John Cooper
BACKGROUND: There has been a great increase in the use of navigation technology in joint arthroplasty. In most types of navigation-assisted surgery, several temporary navigation pins are placed in the patient. Goals of this study are (1) to identify complications and (2) risk factors associated with placement of these pins. METHODS: This is a retrospective cohort study of all navigation-assisted hip and knee arthroplasty performed a single institution over a 3-year period...
April 20, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28515980/investigating-the-effectiveness-of-kinesio%C3%A2-taping-space-correction-method-in-healthy-adults-on-patellofemoral-joint-and-subcutaneous-space
#4
Katie J Lyman, Kassiann Keister, Kara Gange, Christopher D Mellinger, Thomas A Hanson
BACKGROUND: Limited quantitative, physiological evidence exists regarding the effectiveness of Kinesio® Taping methods, particularly with respect to the potential ability to impact underlying physiological joint space and structures. To better understand the impact of these techniques, the underlying physiological processes must be investigated in addition to the examination of more subjective measures related to pain in unhealthy tissues. HYPOTHESIS/PURPOSE: The purpose of this study was to determine whether the Kinesio® Taping Space Correction Method created a significant difference in patellofemoral joint space, as quantified by diagnostic ultrasound...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28510474/increased-magnetic-resonance-imaging-signal-of-the-lateral-patellar-facet-cartilage-a-functional-marker-for-patellar-instability
#5
Anna L Falkowski, Carlo Camathias, Jon A Jacobson, Olaf Magerkurth
BACKGROUND: In the knee joint, predisposition for patellar instability can be assessed by an abnormal Insall-Salvati index, tibial tuberosity-trochlear groove (TTTG) distance, and abnormal shape of patella and trochlea. Given the complex anatomic features of the knee joint with varying positions of the patella during motion, the presence of a single or even a combination of these factors does not inevitably result in patellar instability. After trocheoplasty in patients with trochlear dysplasia, assessment of trochlear cartilage and subchondral bone is limited due to postoperative artifacts...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28493040/stability-of-capsule-closure-and-postoperative-anterior-knee-pain-after-medial-parapatellar-approach-in-tka
#6
Armin Keshmiri, Fabian Dotzauer, Clemens Baier, Günther Maderbacher, Joachim Grifka, Ernst Sendtner
PURPOSE: Anterior knee pain after total knee arthroplasty (TKA) remains a widely discussed postoperative complication. In contrast to sports traumatology, the role of the dissected medial patellofemoral ligament (MPFL) using a medial parapatellar approach in TKA has not been discussed so far. In the present study, it was hypothesized that the attempted repair of the MPFL in TKA by simple closure of the joint capsule may not be successful in some cases, causing anterior knee pain. Furthermore, it was hypothesized, that the success of repair might be influenced by femoral component rotation...
May 10, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28481686/lower-extremity-joint-loads-in-habitual-rearfoot-and-mid-forefoot-strike-runners-with-normal-and-shortened-stride-lengths
#7
Elizabeth R Boyer, Timothy R Derrick
Our purpose was to compare joint loads between habitual rearfoot (hRF) and habitual mid/forefoot strikers (hFF), rearfoot (RFS) and mid/forefoot strike (FFS) patterns, and shorter stride lengths (SLs). Thirty-eight hRF and hFF ran at their normal SL, 5% and 10% shorter, as well as with the opposite foot strike. Three-dimensional ankle, knee, patellofemoral (PF) and hip contact forces were calculated. Nearly all contact forces decreased with a shorter SL (1.2-14.9% relative to preferred SL). In general, hRF had higher PF (hRF-RFS: 10...
May 8, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28479913/an-anatomical-and-osteometric-study-of-the-femoral-sulcus-angle-in-adult-malawians
#8
Anthony Mwakikunga, Kondwani Katundu, Boniface Msamati, Anthony Gbenga Adefolaju, Lynne Schepartz
BACKGROUND: Femoral sulcus angle is particularly important in clinical evaluation of patellofemoral joint. Individuals show considerable differences in asymmetrical dimensions of the femur. OBJECTIVES: To determine the size of femoral sulcus angles in adult black Malawians using the skeletal collection in the department of Anatomy, College of Medicine and assess their gender differences; to compare femoral sulcus angles of Malawians with other ethnic groups. METHODS: A cross sectional study was done in which femoral sulcus angles of dry bones were measured using a goniometer...
December 2016: African Health Sciences
https://www.readbyqxmd.com/read/28470832/subjective-crepitus-as-a-risk-factor-for-incident-symptomatic-knee-osteoarthritis-data-from-the-osteoarthritis-initiative
#9
Grace H Lo, Michael T Strayhorn, Jeffrey B Driban, Lori Lyn Price, Charles B Eaton, Timothy E McAlindon
Objective Subjective crepitus is the complaint of hearing grating, cracking or popping sounds in and/or around a joint. We aimed to evaluate whether there is an association between crepitus and incident symptomatic knee osteoarthritis (SOA) in the Osteoarthritis Initiative (OAI), a multicenter longitudinal U.S. cohort. Methods Knees without baseline SOA were included. Crepitus frequency was assessed using a question from the Knee Injury and Osteoarthritis Outcome Score (KOOS) at baseline, 12-, 24-, and 36-month visits...
May 4, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28467583/repair-of-comminuted-fracture-of-the-lower-patellar-pole
#10
Elsayed Ibraheem Elsayed Massoud
BACKGROUND: Comminuted fracture of the lower patellar pole has characteristics of both patellar fracture and avulsion of the patellar tendon. Therefore, components of both injury types should be considered during treatment. None of the traditional techniques has proven sufficient alone. Currently described is technique that incorporates principles of osteosynthesis as well as repair of the patellar tendon. METHODS: Total of 23 patients with comminuted fracture of the lower patellar pole were treated surgically and prospectively followed for 24 months...
March 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28460712/different-pain-responses-to-distinct-levels-of-physical-activity-in-women-with-patellofemoral-pain
#11
Ronaldo V Briani, Marcella F Pazzinatto, Danilo De Oliveira Silva, Fábio M Azevedo
BACKGROUND: Physical activity levels seem to play a role in patellofemoral pain (PFP); however, few studies have been conducted to confirm this hypothesis. OBJECTIVES: To determine the reported pain levels of women with and without PFP who maintain different levels of physical activity; to determine the capability of these levels to predict pain; and to test the capability of two stair-negotiation protocols, with and without external load, to equalize pain between groups...
March 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28459750/when-and-how-far-to-move-the-tibial-tuberosity-in-patients-with-patellar-instability
#12
Taylor D'Amore, Miho J Tanaka, Andrew J Cosgarea
The many factors contributing to patellar instability have led to various surgical techniques that are used commonly today. When surgery is deemed necessary, the operation should be tailored to the patient's specific pathoanatomy. Patients with malalignment can often be stabilized by moving the tibial tuberosity to a more medial, anteromedial, or distal position. Subsequent changes in the forces acting on the patellofemoral joint will depend on the direction and distance of the tuberosity repositioning. When planning tuberosity osteotomies, it is crucial to understand how to use clinical and imaging modalities to measure and quantify tuberosity position accurately to achieve the desired degree of realignment...
June 2017: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/28457606/combined-measurement-and-modeling-of-specimen-specific-knee-mechanics-for-healthy-and-acl-deficient-conditions
#13
Azhar A Ali, Michael D Harris, Sami Shalhoub, Lorin P Maletsky, Paul J Rullkoetter, Kevin B Shelburne
Quantifying the mechanical environment at the knee is crucial for developing successful rehabilitation and surgical protocols. Computational models have been developed to complement in vitro studies, but are typically created to represent healthy conditions, and may not be useful in modeling pathology and repair. Thus, the objective of this study was to create finite element (FE) models of the natural knee, including specimen-specific tibiofemoral (TF) and patellofemoral (PF) soft tissue structures, and to evaluate joint mechanics in intact and ACL-deficient conditions...
April 20, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28455472/anterior-knee-pain-and-evidence-of-osteoarthritis-of-the-patellofemoral-joint-should-not-be-considered-contraindications-to-mobile-bearing-unicompartmental-knee-arthroplasty-a-15-year-follow-up
#14
T W Hamilton, H G Pandit, D G Maurer, S J Ostlere, C Jenkins, S J Mellon, C A F Dodd, D W Murray
AIMS: It is not clear whether anterior knee pain and osteoarthritis (OA) of the patellofemoral joint (PFJ) are contraindications to medial unicompartmental knee arthroplasty (UKA). Our aim was to investigate the long-term outcome of a consecutive series of patients, some of whom had anterior knee pain and PFJ OA managed with UKA. PATIENTS AND METHODS: We assessed the ten-year functional outcomes and 15-year implant survival of 805 knees (677 patients) following medial mobile-bearing UKA...
May 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28454998/finite-element-analysis-of-the-biomechanical-effects-of-3-posterolateral-corner-reconstruction-techniques-for-the-knee-joint
#15
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Sung-Jae Kim, Sungryul Choi, Moonki Jung, Sung-Hwan Kim
PURPOSE: To compare the forces exerted on the cruciate ligaments and the contact stresses on the tibiofemoral (TF) and patellofemoral (PF) joints with respect to 3 different tibial- and fibular-based posterolateral corner (PLC) reconstructions under dynamic loading conditions. METHODS: A subject-specific finite element knee model was developed by using 3-dimensional anatomic data from motion captures in gait and squat activities, including in vivo knee joint kinematics and muscle forces for the single subject...
April 25, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28450898/a-single-blinded-randomized-parallel-group-superiority-trial-investigating-the-effects-of-footwear-and-custom-foot-orthoses-versus-footwear-alone-in-individuals-with-patellofemoral-joint-osteoarthritis-a-phase-ii-pilot-trial-protocol
#16
Narelle Wyndow, Kay M Crossley, Bill Vicenzino, Kylie Tucker, Natalie J Collins
BACKGROUND: Patellofemoral joint osteoarthritis is a common condition, yet information regarding conservative management is lacking. Foot orthoses are an effective intervention for improving pain and function in younger individuals with patellofemoral pain and may be effective in those with patellofemoral osteoarthritis. This pilot study will seek to establish the feasibility of a phase III randomised controlled trial to investigate whether foot orthoses worn in prescribed motion controlled footwear are superior to prescribed motion control footwear alone in the management of patellofemoral osteoarthritis...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28437567/people-with-patellofemoral-oa-walk-with-different-pelvic-and-hip-kinematics-compared-to-healthy-aged-matched-controls
#17
Kay M Crossley, Anthony G Schache, Hannah Ozturk, Jonathan Lentzos, Melissa Munanto, Marcus G Pandy
Objective, Patellofemoral joint (PFJ) osteoarthritis (OA) is common, yet little is known about how this condition influences lower-limb biomechanical function. This study compared pelvis and lower-limb kinematics in people with and without PFJOA., Methods, Sixty-nine participants (64% women, mean age 56±10 years) with anterior knee pain aggravated by PFJ loaded activities (stair ambulation, rising from sitting, squatting) and radiographic lateral PFJOA on skyline radiographs were compared with 18 controls (78% women, mean age 53±7 years) with no lower-limb pain or radiographic OA...
April 24, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28431578/is-the-effectiveness-of-patellofemoral-bracing-modified-by-patellofemoral-alignment-and-trochlear-morphology
#18
Xi Zhang, Jillian P Eyles, Joanna Makovey, Matthew J Williams, David J Hunter
BACKGROUND: This study was performed to determine if the effectiveness of patellofemoral bracing as a treatment for patellofemoral osteoarthritis is influenced by patellofemoral joint alignment and trochlear morphology. We hypothesized that those with more extreme patellar malalignment would benefit more from bracing. METHODS: Thirty-eight patients who had received bracing as part of a comprehensive treatment plan for patellofemoral osteoarthritis were selected for this study...
April 21, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28422563/effects-of-anterior-knee-displacement-during-squatting-on-patellofemoral-joint-stress
#19
Thomas W Kernozek, Naghmeh Gheidi, Matthew Zellmer, Jordan Hove, Becky L Heinert, Michael R Torry
CONTEXT: Squatting is a common rehabilitation training exercise for Patellofemoral pain syndrome (PFPS). Patellofemoral joint stress (PFJS) during squatting with more anterior knee displacement has not been systematically investigated. OBJECTIVE: The aim was to compare PFJS during squatting using two techniques: Squat while keeping the knees before the toes (SBT) and squat while allowing the knees to go past the toes (SPT). SETTING: University research laboratory...
April 19, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28420082/can-early-rehabilitation-prevent-posttraumatic-osteoarthritis-in-the-patellofemoral-joint-after-anterior-cruciate-ligament-rupture-understanding-the-pathological-features
#20
Nai-Jen Chang, Ming-You Shie, Kuan-Wei Lee, Pei-Hsi Chou, Chih-Chan Lin, Chih-Jou Chu
Knee instability resulting from anterior cruciate ligament (ACL) rupture is a high-risk factor for posttraumatic osteoarthritis (PTOA) in the patellofemoral joint (PFJ). However, whether non-weight-bearing and weight-bearing treatments have chondroprotective effects remains unclear. Twenty-four adult New Zealand White male rabbits were employed in this study. All animals received ACL transection in the right knee and sham surgery in the left knee. The rabbits were randomly assigned to the following groups: (I) In the sedentary (SED) group, the rabbits (n = 6) were simply kept in their cage; (II) In the continuous passive motion (CPM) group, the rabbits (n = 6) performed CPM exercise for 7 days, starting from the first postoperative day; (III) In the active treadmill exercise (TRE) group, the rabbits (n = 6) performed TRE for 2 weeks; (IV) In the CPM + TRE group, the rabbits (n = 6) executed CPM exercise, followed by TRE...
April 14, 2017: International Journal of Molecular Sciences
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