Aims: The aim of this study was to determine and compare the congruency of the articular surface contact area of the patellofemoral joint (PFJ) during both active and passive movement of the knee with the use of an MRI mapping technique in both the stable and unstable PFJ.
Patients And Methods: A prospective case-control MRI imaging study of patients with a history of PFJ instability and a control group of volunteers without knee symptoms was performed. The PFJs were imaged with the use of an MRI scan during both passive and active movement from 0° through to 40° of flexion. The congruency through measurement of the contact surface area was mapped in 5-mm intervals on axial slices. In all, 40 patients were studied. The case group included 31 patients with symptomatic patellofemoral instability and the control group of nine asymptomatic volunteers. The ages were well matched between the case and control groups. The mean age was 25 years (16 to 42; sd 6.9) in the case group and 26 years (19 to 32; sd 5.1) in the control group. There were 19 female and 12 male patients in the case group.
Results: The unstable PFJs were demonstrably less congruent than the stable PFJs throughout the range of knee movement. The greatest mean differences in congruency between unstable and stable PFJ's were observed between 11° and 20° flexion (1.73 cm 4.00 cm; p < 0.005).
Conclusion: The unstable PFJ is less congruent than the stable PFJ throughout the range of knee movement studied. This approach to mapping PFJ congruency produces a measurable outcome and will allow the assessment of pre- and postoperative results following surgical intervention. This may facilitate the design of new procedures for patients with PFJ instability. If a single axial series is to be obtained on MRI scan, the authors recommend 11° to 20° of tibiofemoral flexion, as this was shown to have the greatest difference in contact surface area between the case and control groups. Cite this article: 2019;101-B:552-558.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1302/0301-620X.101B5.BJJ-2018-1246.R1 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effectiveness of Active Support on the quality of life and well-being of people with moderate to mild intellectual disabilities.
Res Dev Disabil
January 2025
Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, the Netherlands; Trajectum, Zwolle, the Netherlands.
Active Support is a support model designed to enhance quality of life through activity engagement in people with intellectual disabilities. The aim of the current study was to investigate whether implementation of Active Support affected quality of life, well-being, and activity engagement of residents with mild to moderate intellectual disabilities, using a cluster randomised controlled design. Fourteen services were recruited, and Active Support was implemented after conducting baseline assessments.
View Article and Find Full Text PDFPatients With a Pathologic Near-Complete Response After Mandatory Total Mesorectal Excision Do Not Provide an Appropriate Control Group for Patients With Local Regrowth.
Dis Colon Rectum
February 2025
Department of Surgery, Colorectal Service, Memorial Sloan Kettering Cancer Center, New York, New York.
Incidence and Risk Factors for Nonreversal of Stoma in Patients With Crohn's Disease: A Single-Center Study.
Dis Colon Rectum
February 2025
Department of General Surgery, Jinling Medical School of Nanjing Medical University, Nanjing, China.
Background: Even in the biological era, permanent stoma is not uncommon in patients with Crohn's Disease.
Objective: This study aimed to investigate the incidence and risk factors of permanent stoma in Crohn's disease patients and provide clinical evidence for reducing this disabling outcome.
Design: Consecutive patients with Crohn's disease who underwent ostomies in the past decade were reviewed.
Mn-Mn Dimers Induced Multimode Emitters in Mn-Activated AZn(PO) (A = K, Rb, and Cs) with Unique [ZnPO] Chains and [ZnO] Groups.
Inorg Chem
January 2025
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China.
Mn-doped luminescent materials play a significant role in a variety of fields, including modern lighting, displays, and imaging. Mn exhibits a broad and adjustable emission, hinging on the local environment of the crystal field and the interaction of the 3d electrons. However, it is still a challenge to realize the precise control of the emission of Mn ions due to site-prior occupation in a specific lattice.
View Article and Find Full Text PDFImpacts of State COVID-19 Vaccine Mandates for Health Care Workers on Health Sector Employment in the United States.
Am J Public Health
January 2025
Yin Wang, Kevin Callison, and Charles Stoecker are with the Department of Health Policy and Management and Julie H. Hernandez is with the Department of International Health and Sustainable Development, Celia Scott Weatherhead School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA.
To assess the impact of state COVID-19 vaccine mandates for health care workers (HCWs) on health sector employment in the United States. Using monthly state-level employment data from the Quarterly Census of Employment and Wages between January and October 2021, we employed a partially pooled synthetic control method that accounted for staggered mandate adoption and heterogeneous treatment effects. We conducted analyses separately for the 4 health care subsectors-ambulatory health care services, hospitals, nursing and residential care, and social assistance-with an additional analysis of 2 industry groups-skilled nursing care and community care for the elderly-under the nursing and residential care subsector.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!