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Patellofemoral joint

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https://www.readbyqxmd.com/read/29231243/neuromuscular-electrical-stimulation-nmes-for-patellofemoral-pain-syndrome
#1
REVIEW
Ana Luiza C Martimbianco, Maria Regina R Torloni, Brenda Ng Andriolo, Gustavo Jm Porfírio, Rachel Riera
BACKGROUND: Patellofemoral pain syndrome, now generally referred to as patellofemoral pain (PFP), is one of the most common orthopaedic disorders, characterised by pain in the anterior or retropatellar knee region. Neuromuscular electrical stimulation (NMES) has been proposed generally as a complementary treatment, associated with other interventions such as exercise, or as a single treatment to increase muscle force, reduce knee pain, and improve function. OBJECTIVES: To assess the effects (benefits and harms) of neuromuscular electrical stimulation for people with patellofemoral pain...
December 12, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29230426/lateral-patellofemoral-ligament-an-anatomic-study
#2
Kalpit N Shah, Steven F DeFroda, James Kristopher Ware, Sarath C Koruprolu, Brett D Owens
Background: Medial instability of the patellofemoral joint is a rare but known phenomenon that may result from an incompetent lateral patellofemoral ligament (LPFL). Surgical reconstruction of the LPFL has been described. However, anatomic details of the ligament have not been the subject of scrutiny. Purpose: To describe the anatomic origin and insertion of the LPFL. Study Design: Descriptive laboratory study. Methods: Ten fresh-frozen, unpaired human cadaveric knees (mean age, 57 years) were dissected to identify the LPFL...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29225015/symptomatic-focal-knee-chondral-injuries-in-national-football-league-combine-players-are-associated-with-poorer-performance-and-less-volume-of-play
#3
Matthew T Provencher, Jorge Chahla, Mark E Cinque, George Sanchez, Nicholas I Kennedy, Daniel B Haber, Ashley J Tisosky, Brendin R Beaulieu-Jones, Mark D Price, James M Whalen, Gilbert Moatshe, Robert F LaPrade
PURPOSE: To (1) describe the magnetic resonance imaging (MRI) characteristics of knee chondral injuries identified at the National Football League (NFL) Combine and (2) assess in-game performance of prospective NFL players with previously untreated knee chondral injuries and compare it with matched controls. METHODS: All players with knee chondral injuries identified at the NFL Combine (2009-2015) were retrospectively reviewed. Players with prior knee surgery were excluded...
December 7, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29221902/a-comparison-of-patellofemoral-cartilage-morphology-and-deformation-in-anterior-cruciate-ligament-deficient-versus-uninjured-knees
#4
Kwadwo A Owusu-Akyaw, Lauren N Heckelman, Hattie C Cutcliffe, E Grant Sutter, Zoë A Englander, Charles E Spritzer, William E Garrett, Louis E DeFrate
Anterior cruciate ligament (ACL) deficient patients have an increased rate of patellofemoral joint (PFJ) osteoarthritis (OA) as compared to the general population. Although the cause of post-injury OA is multi-factorial, alterations in joint biomechanics may predispose patients to cartilage degeneration. This study aimed to compare in vivo PFJ morphology and mechanics between ACL deficient and intact knees in subjects with unilateral ACL ruptures. Eight male subjects underwent baseline MRI scans of both knees...
November 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29209793/degenerative-changes-after-posterior-cruciate-ligament-reconstruction-are-irrespective-of-posterior-knee-stability-mri-based-long-term-results
#5
Clemens Gwinner, Andreas Weiler, Timm Denecke, Julian M M Rogasch, Heide Boeth, Tobias M Jung
INTRODUCTION: Posterior cruciate ligament reconstruction (PCLR) is advocated to prevent an early onset of osteoarthritis. We hypothesized that posterior instability after PCLR correlates with degenerative changes. MATERIALS AND METHODS: MRIs of 42 (12 female/30 male; 39 ± 9 years) patients were enrolled with a minimum 5-year follow-up (FFU) after PCLR. In addition, 25 contralateral and 15 follow-up MRIs (12 months after baseline) were performed. Degenerative changes were graded using WORMS...
December 6, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29209736/magnetic-resonance-imaging-based-morphological-and-alignment-assessment-of-the-patellofemoral-joint-and-its-relationship-to-proximal-patellar-tendinopathy
#6
Michel D Crema, Larissa G Cortinas, Giovanni B P Lima, Rene Jorge Abdalla, Sheila Jean McNeill Ingham, Abdalla Y Skaf
OBJECTIVE: To assess the differences in morphology and alignment of the knee between patients with proximal patellar tendinopathy (PPT) and a control group, using MRI and focusing on the patellofemoral joint. METHODS: We retrospectively included 35 patients with clinically diagnosed and unequivocal findings of PPT on knee MRI, the case group. For the control group, we included 70 patients who underwent knee MRI for other reasons, with no clinical or MRI evidence of PPT...
December 5, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29204862/the-trochlear-isometric-point-is-different-in-patients-with-recurrent-patellar-instability-compared-to-controls-a-radiographical-study
#7
Tulio Campos, Akash Soogumbur, Iain R McNamara, Simon T Donell
PURPOSE: The purpose of the study was to investigate the theoretical isometric point based of the curve of the femoral groove and relating it to the origin of the MPFL femoral tunnel on lateral radiograph by comparing a patellar instability cohort with a control cohort. METHODS: From a Patellar Instability database the radiographs of 40 consecutive patients were analysed to define Schöttle's point, and the arc of the circle of the trochlear groove. A comparison population of 20 radiographs from comparable patients with tibiofemoral joint disorders was used as a control...
December 4, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29202550/the-normal-value-of-tibial-tubercle-trochlear-groove-distance-in-patients-with-normal-knee-examinations-using-mri
#8
Mohammad Sobhanardekani, Mohammad Reza Sobhan, Reza Nafisi Moghadam, Sepehr Nabavinejad, Seid Kazem Razavi Ratki
Patellar instability is a multifactorial common knee pathology that has a high recurrence rate, and the symptoms continue and ultimately predispose the patient to chondromalacia and osteoarthritis. Tibial tuberosity-trochlear groove distance (TTTG) is very important in the assessment of patellofemoral joint instability. The purpose of this study was to report the normal value of TTTG in males and females in different age groups and to assess the reliability of MRI in measuring TTTG. All patients presenting with knee pain and normal examinations of the knee joint, with a normal MRI report, referring to Shahid Sadoughi hospital of Yazd, Iran, from April 2014 to September 2014, were included in the study...
September 2017: Acta Medica Iranica
https://www.readbyqxmd.com/read/29200662/gearing-effects-of-the-patella-knee-extensor-muscle-sesamoid-of-the-helmeted-guineafowl-during-terrestrial-locomotion
#9
V R Allen, R E Kambic, S M Gatesy, J R Hutchinson
Human patellae (kneecaps) are thought to act as gears, altering the mechanical advantage of knee extensor muscles during running. Similar sesamoids have evolved in the knee extensor tendon independently in birds, but it is unknown if these also affect the mechanical advantage of knee extensors. Here, we examine the mechanics of the patellofemoral joint in the helmeted guineafowl Numida meleagris using a method based on muscle and tendon moment arms taken about the patella's rotation centre around the distal femur...
November 2017: Journal of Zoology: Proceedings of the Zoological Society of London
https://www.readbyqxmd.com/read/29181248/effect-of-heel-lifts-on-patellofemoral-joint-stress-during-running
#10
Zachary Mestelle, Thomas Kernozek, Kelly S Adkins, Jessica Miller, Naghmeh Gheidi
Background: Patellofemoral pain is a debilitating injury for many recreational runners. Excessive patellofemoral joint stress may be the underlying source of pain and interventions often focus on ways to reduce patellofemoral joint stress. Purpose: Heel lifts have been used as an intervention within Achilles tendon rehabilitation programs and to address leg length discrepancies. The purpose of this study was to examine the effect of running with heel lifts on patellofemoral joint stress, patellofemoral stress impulse, quadriceps force, step length, cadence, and other related kinematic and spatiotemporal variables...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29168434/changes-in-knee-shape-and-geometry-resulting-from-total-knee-arthroplasty
#11
Mohsen Akbari Shandiz, Paul Boulos, Stefan Karl Saevarsson, Heiko Ramm, Chun Kit Jack Fu, Stephen Miller, Stefan Zachow, Carolyn Anglin
Changes in knee shape and geometry resulting from total knee arthroplasty can affect patients in numerous important ways: pain, function, stability, range of motion, and kinematics. Quantitative data concerning these changes have not been previously available, to our knowledge, yet are essential to understand individual experiences of total knee arthroplasty and thereby improve outcomes for all patients. The limiting factor has been the challenge of accurately measuring these changes. Our study objective was to develop a conceptual framework and analysis method to investigate changes in knee shape and geometry, and prospectively apply it to a sample total knee arthroplasty population...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29159676/the-posterior-anterior-flexed-view-is-better-than-the-anterior-posterior-view-for-assessing-osteoarthritis-of-the-knee
#12
Kilian Rueckl, Friedrich Boettner, Noor Maza, Armin Runer, Ulrich Bechler, Peter Sculco
OBJECTIVE: The aim of this study is to determine whether the posterior-anterior (PA)-flexed view improves the radiographic assessment of patients with knee pain compared with the standard standing anterior-posterior radiograph. MATERIALS AND METHODS: Three hundred and sixty-five patients with knee pain underwent anterior-posterior (AP), PA flexed, lateral, and Merchant radiographs of the knee. Knees were grouped as mild (Kellgren and Lawrence [K-L] 1-2) or severe (K-L 3-4) osteoarthritis (OA) and either varus (medial compartment), valgus (lateral compartment), or patellofemoral OA...
November 20, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29159672/patellar-tracking-should-be-taken-into-account-when-measuring-radiographic-parameters-for-recurrent-patellar-instability
#13
Si Heng Sharon Tan, Mazen M Ibrahim, Zhaojie Joel Lee, Yen Kit Michael Chee, James H Hui
PURPOSE: To date, many radiographic parameters on patellar instability have their measurements taken statically, and have not been studied in various degrees of flexion according to the patellar tracking. There are also limited data regarding the use of these parameters in predicting recurrent patellar dislocation. The current study aims to review the radiographic parameters of the patellofemoral joint in different degrees of knee flexion and to correlate them with the presence of recurrent instability...
November 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29154178/the-effect-of-wedge-and-tibial-slope-angles-on-knee-contact-pressure-and-kinematics-following-medial-opening-wedge-high-tibial-osteotomy
#14
Marianne S Black, Agnes G d'Entremont, Robert G McCormack, Gregory Hansen, Derek Carr, David R Wilson
BACKGROUND: High tibial osteotomy is a surgical procedure to treat medial compartment osteoarthritis in varus knees. The reported success rates of the procedure are inconsistent, which may be due to sagittal plane alignment of the osteotomy. The objective of this study was to determine the effect of changing tibial slope, for a range of tibial wedge angles in high tibial osteotomy, on knee joint contact pressure location and kinematics during continuous loaded flexion/extension. METHODS: Seven cadaveric knee specimens were cycled through flexion and extension in an Oxford knee-loading rig...
November 2, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29141674/repair-of-articular-cartilage-and-subchondral-defects-in-rabbit-knee-joints-with-a-polyvinyl-alcohol-nano-hydroxyapatite-polyamide-66-biological-composite-material
#15
Tao Guo, Xiaobin Tian, Bo Li, Tianfu Yang, Yubao Li
BACKGROUND: This study sought to prepare a new PVA/n-HA/PA66 composite to investigate the repair of articular cartilage and subchondral defects in rabbit knee joints. METHODS: A 5 × 5 × 5 mm-sized defect was created in the patellofemoral joints of 72 healthy adult New Zealand rabbits. The rabbits were then randomly divided into three groups (n = 24): PVA/n-HA+PA66 group, polyvinyl alcohol (PVA) group, and control (untreated) group. Cylindrical PVA/n-HA+PA66, 5 × 5 mm, comprised an upper PVA layer and a lower n-HA+PA66 layer...
November 15, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29140144/joint-moment-angle-properties-of-the-hip-extensors-in-subjects-with-and-without-patellofemoral-pain
#16
Curtis Kindel, John Challis
Strength deficits of hip extension in individuals with patellofemoral syndrome are commonly reported in the literature. No literature to date has examined these deficits with variable positions of the knee and hip; altering knee angle alters the length and therefore potentially the force produced by the biarticular muscles. Beyond strength, neuromuscular control can also be assessed through the analysis of isometric joint moment steadiness. Subjects consisted of a group of individuals with patellofemoral syndrome (n=9), and a group of age and size matched controls with no symptoms (n=9)...
November 15, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29137899/joint-gap-in-mid-flexion-is-not-a-predictor-of-postoperative-flexion-angle-after-total-knee-arthroplasty
#17
Yukihide Minoda, Shigeru Nakagawa, Ryo Sugama, Tessyu Ikawa, Takahiro Noguchi, Masashi Hirakawa
BACKGROUND: Postoperative knee flexion angle is one of the most important outcomes of total knee arthroplasty (TKA). Intraoperative ligament balancing may affect the postoperative range of motion of the knee. However, the relationship between intraoperative ligament balancing and postoperative flexion angle was still controversial. The purpose of this study was to determine whether intraoperative joint gap affects postoperative knee flexion angle or not. METHODS: Prospective multicenter study of 246 knees with varus osteoarthritis undergoing a posterior-stabilized, mobile-bearing TKA was performed...
November 11, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29133185/squatting-re-education-with-lumbo-pelvic-thigh-muscles-cocontraction-improves-functional-performance-in-patellofemoral-pain-syndrome-a-case-report
#18
Nagarajan Manickaraj
Anterior knee pain with or without joint crepitus during squatting is the common clinical feature in the individuals with patellofemoral pain syndrome (PFPS). Altered lower extremity alignment and lumbo-pelvic-thigh muscles motor control is often associated with PFPS. Although current interventions recommend individual muscle activation and strength training exercises, the reported benefits of cocontraction based exercises in PFPS is limited. It might be due to the long standing hypothesis that the exercise induced cocontraction of thigh muscles may induce a negative effect by increasing the joint contact forces in individuals with knee osteoarthritis...
November 10, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29129614/mid-term-clinical-functional-and-radiographic-outcomes-of-105-gender-specific-patellofemoral-arthroplasties-with-or-without-the-association-of-medial-unicompartmental-knee-arthroplasty
#19
Sergio Romagnoli, Matteo Marullo
BACKGROUND: The purpose of this study is to evaluate clinical and radiographic outcomes after gender-specific patellofemoral arthroplasty (PFA) either isolated or combined with unicompartmental knee arthroplasty (UKA). METHODS: A total of 105 PFAs in 85 patients were reviewed: 64 knees had isolated patellofemoral osteoarthritis and received an isolated PFA, and 41 knees with bicompartmental osteoarthritis were treated with medial UKA and PFA. Preoperative and postoperative clinical and functional assessment included knee range of motion, Knee Society Score, University of California Los Angeles Activity Score, Tegner Activity Level Scale, and visual analogue scale pain...
October 24, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29117248/medial-knee-loading-is-altered-in-subjects-with-early-osteoarthritis-during-gait-but-not-during-step-up-and-over-task
#20
Susana Meireles, Mariska Wesseling, Colin R Smith, Darryl G Thelen, Sabine Verschueren, Ilse Jonkers
This study evaluates knee joint loading during gait and step-up-and-over tasks in control subjects, subjects with early knee OA and those with established knee OA. Thirty-seven subjects with varying degrees of medial compartment knee OA severity (eighteen with early OA and sixteen with established OA), and nineteen healthy controls performed gait and step-up-and-over tasks. Knee joint moments, contact forces (KCF), the magnitude of contact pressures and center of pressure (CoP) location were analyzed for the three groups for both activities using a multi-body knee model with articular cartilage contact, 14 ligaments, and six degrees of freedom tibiofemoral and patellofemoral joints...
2017: PloS One
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