A Roentgen Stereophotogrammetric System

Selvik, Göran; Alberius, Per; As, Aronson

doi:10.1177/028418518302400412

Cited by 86 publications

(16 citation statements)

References 6 publications

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“…An internal check in the computer program could reveal and exclude unstable tantalum markers. The calculations were performed as described by Selvik (Selvik et al 1983, Selvik 1989, 1990, using the computer programs Kinlab, Kinerr and X-RAY 90.…”

Section: Methodsmentioning

confidence: 99%

Can an external frame fixation reduce the movements in the sacroiliac joint?: A radiostereometric analysis of 10 patients

Sturesson

Udén

Önsten³

1999

Acta Orthopaedica Scandinavica

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Section: Methodsmentioning

confidence: 99%

Can an external frame fixation reduce the movements in the sacroiliac joint?: A radiostereometric analysis of 10 patients

Sturesson

Udén

Önsten³

1999

Acta Orthopaedica Scandinavica

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“…Daily measurements with this mikro-knemometer revealed an irregular pattern of repetitive mini growth spurts very similar to what has been shown in lower leg growth of children. The technique was compared with X-ray stereophotogrammetry [104, 105]. For this purpose, tantal bone markers were implanted close to the epiphyseal growth plates of animals [106] which then were both X-rayed and measured by mikro-knemometry.…”

Section: Animal Studies On Short-term Growthmentioning

confidence: 99%

The Analysis of Short-Term Growth

Hermanussen¹

1998

Horm Res Paediatr

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The analysis of short-term growth needs repetitive measurements of body stature or of segments of the body. When body stature is measured at monthly intervals, an irregular incremental pattern becomes obvious with a number of large-scale components such as series of prepubertal and pubertal growth spurts, seasonal influences on height gain, and influences of the psychosocial and economic background. When measurement intervals decrease, incremental patterns appear even more irregular, and a number of short-scale components become apparent that are distinct from measurement error. The review summarizes the analysis of short-term growth, and presents the current findings supporting different views on how growth progresses at short term. In particular, observations are presented that suggest growth being a pulsatile, a periodic, a saltatory, and a chaotic event. Some recent animal studies and studies in human newborns are added in detail as they illustrate short-term growth on the basis of accurate 24-hour measurements of the lower leg. The latter investigations support the idea of short-term growth being characterized by chaotic series of ‘mini growth spurts’ that occur at intervals of approximately 4–5 days, not only in human neonates, but also in rats. The amplitude of mini growth spurts ranges between 2 and some 10 mm, and growth velocity of each spurt also varies considerably so that one spurt needs between less than 1 and up to several days for completion.

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“…During the last decades, radiostereometric analysis (RSA) has emerged as a way to assess prosthetic fixation. 7-9 The method has been used extensively in both hip and knee arthroplasty, 10-25 with data from early post-operative time-points serving as a predictor of late mechanical loosening. 10,11,15,18,26 The major benefit of early detection of instability is that the exposure of patients to potentially unstable prostheses can be limited.…”

Section: Introductionmentioning

confidence: 99%

Does a new knee design perform as well as the design it replaces?

Molt

Ljung

2012

Bone & Joint Research

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ObjectivesThe objective of this study was to compare the early migration characteristics and functional outcome of the Triathlon cemented knee prosthesis with its predecessor, the Duracon cemented knee prosthesis (both Stryker).MethodsA total 60 patients were prospectively randomised and tibial component migration was measured by radiostereometric analysis (RSA) at three months, one year and two years; clinical outcome was measured by the American Knee Society score and the Knee Osteoarthritis and Injury Outcome Score.ResultsThere were no statistically significant differences in rotation or translation around or along the three coordinal axes, or in the maximum total point motion (MTPM) during the two-year follow-up.ConclusionsThe Triathlon cemented knee prosthesis has similar early stability and is likely to perform at least as well as the Duracon cemented knee prosthesis over the longer term.

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A Roentgen Stereophotogrammetric System

Cited by 86 publications

References 6 publications

Can an external frame fixation reduce the movements in the sacroiliac joint?: A radiostereometric analysis of 10 patients

Can an external frame fixation reduce the movements in the sacroiliac joint?: A radiostereometric analysis of 10 patients

The Analysis of Short-Term Growth

Does a new knee design perform as well as the design it replaces?

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