MRI Registration for Human Hip Kinematics

Measurement of joint kinematics can provide knowledge to help improve joint prosthesis design, as well as identify joint motion patterns that may lead to joint degeneration or injury. More investigation into how the hip translates in live human subjects during high amplitude motions is needed. This work presents a design of a non-invasive method using the registration between images from conventional Magnetic Resonance Imaging (MRI) and open MRI to calculate three dimensional hip joint kinematics. The method was tested on a single healthy subject in three different poses. MRI protocols for the conventional gantry, high-resolution MRI and the open gantry, lowresolution MRI were developed. The scan time for the low-resolution protocol was just under 6 minutes. High-resolution meshes and low resolution contours were derived from segmentation of the high-resolution and low-resolution images, respectively. Low-resolution contours described the poses as scanned, whereas the meshes described the bones’ geometries. The meshes and contours were registered to each other, and joint kinematics were calculated. The segmentation and registration were performed for both cortical and sub-cortical bone surfaces. A repeatability study was performed by comparing the kinematic results derived from three users’ segmentations of the sub-cortical bone surfaces from a low-resolution scan. The root mean squared error of all registrations was below 1.92mm. The maximum range between segmenters in translation magnitude was 0.95mm, and the maximum deviation from the average of all orientations was 1.27◦. This work demonstrated that this method for non-invasive measurement of hip kinematics is promising for measuring high-range-of-motion hip motions in vivo.

Prevention of cement leakage into the hip joint by a standard cement plug during PFN-A cement augmentation: a technical note.

Medial penetration of the helical blade into the hip joint after fixation of trochanteric fractures using the proximal femur nail antirotation (PFN-A) is a potential failure mode. In low demand patients a blade exchange with cement augmentation may be an option if conversion to total hip arthroplasty is unfeasible to salvage the cut-through. This article describes a technique to avoid intraarticular cement leakage using a cement plug to close the defect in the femoral head caused by the cut-through.

Hip fracture outcomes in people age 50 and over : mortality, service use, expenditures, and long-term functional impairment /

"PB94-107653"--Cover.

Second International Brewers' Congress, held at Chicago ... October 18-21, 1911. Report of the proceedings, with an account of the Second International Barley and Hop Prize Exhibition and brief history of the American Exposition of Brewing Machinery, Materials and Products.

Plates printed on both sides.

Osteoporosis and hip fractures : 1995-2000 /

Hip fracture is the most adverse outcome of osteoporosis. Few surveillance sources exist to estimate the extent of the burden of illness of osteoporosis in Illinois. Because hip fractures are an important proxy measure for the existence of osteoporosis, the Illinois Health Care Cost Containment Council examined hospital use, treatment and outcome measures for hip fracture patients during the years 1995 through 2000. Osteoporosis, as the underlying cause of hip fracture hospitalizations, is investigated for results of treatment and disposition at discharge. In the year 1995, 12,637, discharges for hip fracture patients were reported by Illinois hospitals. In contrast, in the year 2000, 12,311, discharges for hip fracture patients were reported by Illinois hospitals. This study will provide a descriptive analysis of hospital reported discharges during this six-year period, focusing on patient age and gender, cause of injury, treatments, outcomes, billed charges and expected payment source. A significant percentage of hip fractures occurred in people aged 65 and above. Hip fracture rates per thousand persons in females exceeded males in every age group in the study. Females accounted for approximately 75% of all hip fracture discharges during the study period. Facility charges for hip fracture cases in 1995 were over $213.5 million. Comparable charges in 2000 exceeded $270 million. Over 80% of patients in 2000 were discharged to another health care facility for additional care. A review of pathological fractures and reported cases of diagnosed osteoporosis are included to round out the study.

Nouvelle description du Cap de Bonne-Espérance : avec un journal historique d'un voyage de terre, fait par ordre du gouverneur...Ryk Tulbach, dans l'intérieur de l'Afrique, par une caravane de quatre-vingt-cinq personnes, sous le commandement du Capitain Mr. Henri Hop.

"Nouvelle découverte de l'arbre de cire au cap de Bonne-Espérance, avec une description de cet arbre dans d'autres pays," (pt.ii: 88-98).

Operator and organizational maintenance manual ... : pistol, caliber .45, automatic, M1911A1, with holster, hip (1005-673-7965) and pistol, caliber .45, automatic, M1911A1, with holster, shoulder (1005-561-2003).

"September 1968."

Junior Hop, 1920

University of Michigan scrapbook (Daybook, image #21)

The town and country brewery book : or, Every man his own brewer, and cellarman, malster and hop-merchant : conducted on principles of health, profit, & economy ... /

Imprint date from BM 25:859; Mansell 72:365.