Rotational strength of the femoral neck: Computed tomography in cadavers

Husby, Torstein; Høiseth, Arne; Alho, A; Rønningen, Helge

doi:10.3109/17453678909149279

Cited by 13 publications

(7 citation statements)

References 13 publications

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“…The correlations to cortical bone strength seem to be less good (Snyder and Schneider 1991). The strength of the femoral neck is correlated to bone mineral assessed by various absorptiometric methods (Vose and Mack 1963, Dalen et al 1976, Alho et al 1985, Esses et al 1989, Husby et al 1989, Beck et al 1990. Although linear equations have explained the association between bone mineral and mechanical strength in many human bone materials, the studies of Currey (1969) on animal bones suggest that an increase of bone density above an optimal level reduces bone strength.…”

Section: Mechanics Of Fragile Bonementioning

confidence: 99%

Mineral and mechanics of bone fragility fractures: A review of fixation methods

Alho

1993

Acta Orthopaedica Scandinavica

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Section: Mechanics Of Fragile Bonementioning

confidence: 99%

Mineral and mechanics of bone fragility fractures: A review of fixation methods

Alho

1993

Acta Orthopaedica Scandinavica

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“…18 patients aged 12-20 underwent surgery. The diagnoses were myelomeningocele (I), Duchennes muscular dystrophy (7), other types of muscular dystrophy or spinal atrophy (4), cerebral palsy (4), and traumatic plegia (2). The curves were measured according to Cobb from 33 to I34 degrees.…”

Section: Discussionmentioning

confidence: 99%

“…This is caused by an increased inetabolism in the hone, and occur early after fracture (4). The skeleton seems to be richly innervated (3), and normal innervation may he important for the response of the bony tissue to injury ( 5 ) .…”

Section: Fracturesmentioning

confidence: 99%

Proceedings Dissertations

1994

Acta Orthopaedica Scandinavica

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The presentation is intended to call attention to an intemational registration system that is highly useful in orthopedics as well, in this instance to make a survey of the consequences of lesions of the anterior cruciate ligament of the knee. The patient's requirements or wishes on the one hand, and the residual capacity on the other determine the management with a view to limiting or preventing further damage to the knee joint. Treatment may be either conservative or surgical.The ICIDH system has been in use since 1986 in the Zwolle registration project. The ICIDH (International Classification of Impairments, Disabilities and Handicaps), composed by the WHO in 1989, describes the consequences of a pathological condition, in this case a lesion of the anterior cruciate ligament. Three levels are to be distinguished firstly there are impairments: consequences for the organ, the knee joint. These lead at the second level to disabilities, consequences for the person, his body, which at the third level result in a handicap in his social functioning.Apan from the impairments such as pain, swelling and reduced mobility, disabilities are scored regarding walking on a flat or uneven surface, stairclimbing etc., with manifestations in activities of daily life, housework, occupation and sports. The previously accepted Lysholm disability score was incorporated and plotted against the intensity of activity in the Tegner score. The handicap score indicates the difference between the desired activity gmte and the score achieved. A patient's handicap score decreases if a treatment succeeds, but also if he resigns himself to a reduced activities level.The variations of scores on all three levels over the period 1986-1989 are shown. The system not only allows comparison of groups, acute-chronic, partial-total lesionb surgical-conservative treatment, but particularly also discloses the individual result.Partial lesions appear to have slightly lesser residual consequences than total lesions.If in the individual case a conservative treatment has the effect that the disability does not become a handicap, that treatment has been successful. It remains part of the orthopedist's task to assess if the damage, although not repaired, is sufficiently limited and if future damage is adequately prevented.The three levels of the IClDH are also suitable to describe the process of the evolution of the consequences of a lesion to the locomotor system. Method: The QofL was studied with the aid of 4 structured questionnaires and of functional examination in terms of the Harris Hip Score (HHS). The questionnaires were sent out twice, at an interval of 6 months to all females between the ages of 65 and 75 who 1) were on the waiting list and 2) had undergone an operation during the year before. The questionnaires included a request to visit the hospital for function testingResults: A total of 295 questionnaires were sent out; the response rate was 80%. The HHS was established in 35% of the patients. All methods indicated that THP leads to a gain in Q...

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“…As earlier stated (Mazess 1983) dual-energy computed tomography increases the accuracy, but the precision may be reduced compared with single-energy computed tomography. Mechanical tests have shown that rotational and axial loading of the femur have the highest correlation with the QCT bone-massrelated measurements (Alho et al 1988, Husby et al 1989). Our present report also strongly suggests that the mass values of both QCTof bone and of bone-minera1 content may be even more interesting than the plain density recordings.…”

Section: Discussionmentioning

confidence: 99%

“…All the specimens were scanned with a GE 8800 (General Electric, Milwaukee, WI, USA) using 120 Kv, 100 mA single energy. All the quantitative computed tomography (QCT) recordings were done consecutively during 1 day with- out calibration phantoms, since the system is stable (Husby et al 1989). In the QCT slices no distinction was made between cortical and cancellous bone.…”

Section: Methodsmentioning

confidence: 99%

Quantification of bone mineral measured by single-energy computed tomography

Husby

Høiseth

Haffner³

et al. 1989

Acta Orthopaedica Scandinavica

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Twenty cadaver femoral condyles were examined with single-energy quantitated computed tomography (QCT), and the composition of the bone scanned was analyzed chemically. The calcium concentration correlated well with the QCT density ( i = 0.89,P < 0.001). The highest correlation was recorded between the total calcium content in the scanned slices and the bone mass-related measures recorded by QCT ( r

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Rotational strength of the femoral neck: Computed tomography in cadavers

Cited by 13 publications

References 13 publications

Mineral and mechanics of bone fragility fractures: A review of fixation methods

Mineral and mechanics of bone fragility fractures: A review of fixation methods

Proceedings Dissertations

Quantification of bone mineral measured by single-energy computed tomography

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