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knee alignment

Julien Clément, Panagiota Toliopoulos, Nicola Hagemeister, François Desmeules, Alexandre Fuentes, Pascal-André Vendittoli
BACKGROUND: Normal 3D knee kinematics during gait is still not well understood, especially regarding differences between women and men. RESEARCH QUESTION: The objective of the present study was to characterize 3D knee kinematics during gait in healthy women and men with a validated tool. METHODS: Knee kinematics was analysed with the KneeKG™ system in 90 healthy subjects (49 females and 41 males). 3D knee rotations were compared between women and men, and between right and left knees...
June 11, 2018: Gait & Posture
Rahul Khare, Branislav Jaramaz, Brian Hamlin, Kenneth L Urish
Unicondylar Knee Arthroplasty (UKA) is a minimally-invasive surgical procedure for treating isolated compartmental knee osteoarthritis. Accurate implant placement is crucial for a successful UKA procedure. Previous work has shown the improvement in UKA by using robotic systems. Here, we present the implant alignment accuracy of a hand-held robotic UKA system compared with a conventional manual UKA system for 12 cadaver specimens. Two surgeons carried out equal number of medial UKAs with robotic UKA on one knee and the manual UKA on the other knee...
December 2018: Computer Assisted Surgery (Abingdon, England)
Tien Yeoh, Efthymios Iliopoulos, Alex Trompeter
The most commonly accepted system of classification for tibia plateau fractures is that of Schatzker. Increasingly, both high energy injuries and atypical osteoporotic fragility failures have led to more complex, unusual and previously undescribed fracture patterns being recognized. We present a case of a patient with a previously unreported pattern of tibia plateau fracture and knee dislocation. We highlight the challenges confronted and present the management and the outcomes of his injury. A 28-year old male motorcyclist was involved in a head on collision with a truck and was transferred by helicopter to our level 1 major trauma centre emergency department...
May 24, 2018: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
Fateme Badie, Hamid Reza Katouzian, Mostafa Rostami
The varus knee has been defined as a Hip-Knee-Ankle alignment of less than 180 degrees. Varus knee alignment increases the load on the medial knee and also the risk of osteoarthritis. High tibial osteotomy has been designed to modify the malalignment of varus knee. The aim of this study was to investigate the osteotomy effects on knee adduction moment (KAM) and contact forces using a musculoskeletal and subject-specific knee model. A patient with varus knee and no symptoms of any other disease or disability participated in this study...
June 18, 2018: Journal of Medical Engineering & Technology
Sami Shalhoub, Wayne E Moschetti, Leonid Dabuzhsky, David S Jevsevar, John M Keggi, Christopher Plaskos
BACKGROUND: The traditional goal of the gap-balancing method in total knee arthroplasty is to create equal and symmetric knee laxity throughout the arc of flexion. The purpose of this study was to (1) quantify the laxity in the native and the replaced knee throughout the range of flexion in gap-balancing total knee arthroplasty (TKA) and (2) quantify the precision in achieving a targeted gap profile throughout flexion using a robotic-assisted technique with active ligament tensioning...
May 14, 2018: Journal of Arthroplasty
Kwang Il Lee, Merissa Olmer, Jihye Baek, Darryl D D'Lima, Martin K Lotz
The aim of this study was to examine the potential of platelet-derived growth factor (PDGF)-coated decellularized meniscus scaffold in mediating integrative healing of meniscus tears by inducing endogenous cell migration. Fresh bovine meniscus was chemically decellularized and covalently conjugated with heparin and PDGF-BB. In vitro PDGF release kinetics was measured. The scaffold was transplanted into experimental tears in avascular bovine meniscus explants and cultured for 2 and 4 weeks. The number migrating and proliferating cells at the borderline between the scaffold and injured explant and PDGF receptor-β (PDGFR β) expressing cells were counted...
June 13, 2018: Acta Biomaterialia
Laurens De Cock, Jan Dauwe, Lukas A Holzer, Johan Bellemans
PURPOSE: Weight-bearing sports might influence the alignment of the lower extremities during growth. The relationship between participation in weight-bearing sports and the alignment of the lower extremities in adolescents has not been adequately studied yet. The aim of the study was to investigate whether sports participation during growth in early adolescence is correlated with the development of genu varum. METHODS: The design was a correlation study in which 1008 (564 boys, 444 girls) healthy adolescents (from 12 to 19 years of age) were recruited in secondary schools...
June 15, 2018: International Orthopaedics
Siamak Sabour
No abstract text is available yet for this article.
June 13, 2018: Journal of Knee Surgery
George L Vestermark, Susan M Odum, Bryan D Springer
Background: Periprosthetic fracture following total knee arthroplasty (TKA) is usually associated with a traumatic event and typically treated with fracture fixation techniques. However, we report on a series of patients with early atraumatic condyle fractures that occurred as a result of insufficiency of the unloaded preoperative femoral condyle treated with delayed reconstruction. Methods: We retrospectively reviewed a series of 7 patients who sustained femoral condyle fractures following TKA and evaluated risk factors for insufficiency...
June 2018: Arthroplasty Today
Justin T Deen, Terry B Clay, Dane A Iams, MaryBeth Horodyski, Hari K Parvataneni
Background: In an effort to minimize backside polyethylene wear and osteolysis associated with titanium tibial baseplates, many manufacturers have transitioned to cobalt chromium alloys. Recent literature has implicated thicker cobalt chromium designs as a potential source of increased stress shielding and resorption. We report the incidence of proximal tibial bone resorption in a large consecutive series of patients undergoing total knee arthroplasty, with a modern total knee design...
June 2018: Arthroplasty Today
Ujjwal Kanti Debnath, Dipak Kumar Jha, Prasanta Kumar Pujari
Background: High-energy fractures of proximal tibia (Schatzker VI) are associated with severe articular depression, separation of both condyles, diaphyseal comminution & dissociation with loss of integrity of the soft-tissue envelope. Complications of plating are well known since last 50years in these difficult fractures. An alternative method was proposed by Ilizarov (ring fixator) and was adopted for the treatment of these complex injuries. Aim of study: To analyse the results of patients who had ring fixator for the management of high-energy fractures (Schatzker VI) of the proximal tibia...
April 2018: Journal of Clinical Orthopaedics and Trauma
Timothy McGrath, Richard Fineman, Leia Stirling
Inertial measurement units (IMUs) have been demonstrated to reliably measure human joint angles—an essential quantity in the study of biomechanics. However, most previous literature proposed IMU-based joint angle measurement systems that required manual alignment or prescribed calibration motions. This paper presents a simple, physically-intuitive method for IMU-based measurement of the knee flexion/extension angle in gait without requiring alignment or discrete calibration, based on computationally-efficient and easy-to-implement Principle Component Analysis (PCA)...
June 8, 2018: Sensors
Eirik Aunan, Stephan M Röhrl
Background and purpose - In the classical mechanical alignment technique, ligament balancing is considered a prerequisite for good function and endurance in total knee arthroplasty (TKA). However, it has been argued that ligament balancing may have a negative effect on knee function, and some authors advocate anatomic or kinematic alignment in order to reduce the extent of ligament releases. The effect of the trauma induced by ligament balancing on functional outcome is unknown; therefore, the aim of this study was to investigate this effect...
June 8, 2018: Acta Orthopaedica
Toshifumi Fujiwara, Kenjiro Fujimura, Satoshi Hamai, Satoshi Kamura, Yasuharu Nakashima, Hisaaki Miyahara
OBJECTIVES: This study retrospectively investigated the mid-term outcome of Legacy constrained condylar knee (LCCK) prosthesis in patients with rheumatoid arthritis (RA) having severe varus/valgus deformity, instability and/or bone loss. METHODS: Between January 2000 and December 2015, LCCK prostheses had been performed in 32 knees of 25 patients with RA, and 23 knees of 17 patients of the postoperative follow-up minimum 2 years were analyzed in this study (Primary: 14 knees, Revision: 9 knees)...
June 8, 2018: Modern Rheumatology
Kristie B Hadden, Latrina Y Prince, Marty K Bushmiaer, Jamie C Watson, C Lowry Barnes
OBJECTIVES: This study assessed patients' health literacy and expectations for total hip (THA) and total knee (TKA) replacement surgery, and compared health literacy levels of patients and their caregivers. METHODS: A convenience sample of 200 THA/TKA participants, patients and their caregivers, participated in this study. RESULTS: Results demonstrated no statistical difference in health literacy between patients and their caregivers. However, patients with lower health literacy had significantly lower expectations for walking after surgery...
May 28, 2018: Patient Education and Counseling
Sharon Jiyoon Jung, Myung Geun Kook, Sungchul Kim, Kyung-Sun Kang, Kwang-Sup Soh
Homing of stem cells (SCs) to desired targets such as injured tissues remains a lingering problem in cell-based therapeutics. Studies on the biodistribution of intravenously administered SCs have shown the inefficacy of blood vessels as the homing path because most of the injected SCs are captured in the capillary beds of the lungs. We considered an alternative administration method utilizing the acupuncture meridians or the primo vascular system (PVS). We injected SCs at the acupoint Zusanli (ST-36) below the knee of a nude mouse with a spinal cord injured at the thoracic T9-10 vertebrae...
June 4, 2018: Journal of Acupuncture and Meridian Studies
Maurice Mohr, Tanja Schön, Vinzenz von Tscharner, Benno M Nigg
Introduction: The vasti muscles have to work in concert to control knee joint motion during movements like walking, running, or squatting. Coherence analysis between surface electromyography (EMG) signals is a common technique to study muscle synchronization during such movements and gain insight into strategies of the central nervous system to optimize neuromuscular performance. However, different assessment methods related to EMG data acquisition, e.g., different electrode configurations or amplifier technologies, have produced inconsistent observations...
2018: Frontiers in Physiology
Sumiko Yamamoto, Souji Tanaka, Naoyuki Motojima
BACKGROUND: The effect of plantar flexion resistance of ankle-foot orthoses on the ankle and knee joints is well known, but its effect on the hip joint and upper body movement during the gait of stroke patients remains unclear. OBJECTIVES: To compare the effect of an ankle-foot orthosis with plantar flexion stop and an ankle-foot orthosis with plantar flexion resistance on the gait of stroke patients in the subacute phase. STUDY DESIGN: Randomized controlled trial...
May 1, 2018: Prosthetics and Orthotics International
Arsalan Ghourbanpour, Ghadam Ali Talebi, Somayeh Hosseinzadeh, Naser Janmohammadi, Mohammad Taghipour
QUESTION: What are the effects of patellar taping on pain, functional disability and patellar alignments in Patellofemoral Pain Syndrome (PFPS)? DESIGN: Double-blind randomized clinical trial. PARTICIPANTS: Thirty PFPS Patients were randomly divided into two groups, intervention and control. INTERVENTION: Patients in control group received only the routine physiotherapy. In addition to routine physiotherapy, patellar taping was used in the intervention group...
April 2018: Journal of Bodywork and Movement Therapies
Nattapol Tammachote, Narat Kriengburapha, Adisai Chaiwuttisak, Supakit Kanitnate, Krit Boontanapibul
BACKGROUND: Proper knee alignment and prosthesis position may theoretically provide better surgical results and increase longevity of total knee arthroplasty. The 3-feet standing long radiograph (LR) is the gold standard for assessment of these parameters. However, the conventional standing regular knee radiograph (RR) is still being used because of convenience and lower cost. We conducted a study to investigate the accuracy of RR compared to LR in assessing the coronal plane prosthesis position...
May 30, 2018: Journal of Arthroplasty
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