A quantitative approach to radiography of the lower limb. Principles and applications

Cooke, T. D. V.; Scudamore, R. A.; Bryant, J. T.; Sorbie, Charles; Siu, D.; Fisher, B.

doi:10.1302/0301-620x.73b5.1894656

Cited by 130 publications

(99 citation statements)

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“…On these long-leg radiographs, pre-and postoperatively, the femoral angle (CH = condylar axis to hip center), the tibial angle (PA = plateau axis to ankle), and the articular deformation (CP = condylar axis and plateau axis) were calculated. Then the hipknee-ankle angle was calculated as the sum of the three previously defined angles (HKA = CH + PA + CP) considering CP as positive in case of lateral convergence [8,9]. Postoperative alignments of the femoral and tibial components as well as the postoperative alignment of the limb were assessed using the same method on long-leg radiographs performed using the same standardized protocol as preoperatively [8,9].…”

Section: Methodsmentioning

confidence: 99%

“…Then the hipknee-ankle angle was calculated as the sum of the three previously defined angles (HKA = CH + PA + CP) considering CP as positive in case of lateral convergence [8,9]. Postoperative alignments of the femoral and tibial components as well as the postoperative alignment of the limb were assessed using the same method on long-leg radiographs performed using the same standardized protocol as preoperatively [8,9]. The presence, extent, or progression of femoral or tibial radiolucencies according to the Knee Society roentgenographic score was evaluated on full tangential AP and lateral radiographs [18].…”

Section: Methodsmentioning

confidence: 99%

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Long-term Results With a Lateral Unicondylar Replacement

Argenson

Parratte

Bertani

et al. 2008

Clinical Orthopaedics &Amp; Related Research

118

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Long-term Results With a Lateral Unicondylar Replacement

Argenson

Parratte

Bertani

et al. 2008

Clinical Orthopaedics &Amp; Related Research

118

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show abstract

“…These were part of the QUESTOR Precision Radiographic (QPR) procedure and included an anterio-posterior view of the hip and the knee as well as a lateral knee view for the test leg only [8,9]. Lead beads taped to the skin at the locations where the motion markers were to be placed were imaged along with the internal bone structure.…”

Section: Methodsmentioning

confidence: 99%

Knee and hip kinetics during normal stair climbing

2002

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Understanding joint kinetics during activities of daily living furthers our understanding of the factors involved in joint pathology and the effects of treatment. In this study, we examined hip and knee joint kinetics during stair climbing in 35 young healthy subjects using a subject-specific knee model to estimate bone-on-bone tibiofemoral and patello-femoral joint contact forces. The net knee forces were below one body weight while the peak posterior-anterior contact force was close to one body weight. The peak distal-proximal contact force was on average 3 times body weight and could be as high as 6 times body weight. These contact forces occurred at a high degree of knee flexion where there is a smaller joint contact area resulting in high contact stresses. The peak knee adduction moment was 0.42 (0.15) N m/kg while the flexion moment was 1.16 (0.24) N m/kg. Similar peak moment values, but different curve profiles, were found for the hip. The hip and knee posterio-anterior shear forces and the knee flexion moment were higher during stair climbing than during level walking. The most striking difference between stair ascent and level walking was that the peak patello-femoral contact force was 8 times higher during stair ascent. These data can be used as baseline measures in pathology studies, as input to theoretical joint models, and as input to mechanical joint simulators.

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“…Standard radiographs, computed tomography, MRI, or intraoperative navigation systems can be used to perform these measurements. Standard radiographs can, in a controlled setting and in normal patients with minimal deformity, be quite accurate [8,9]. However, these required conditions are difficult to achieve and are not applicable to patients with extremity-deforming osteoarthritis.…”

Section: Introductionmentioning

confidence: 99%

Radiographic and Navigation Measurements of TKA Limb Alignment Do Not Correlate

Yaffe

Koo

Stulberg

2008

Clinical Orthopaedics &Amp; Related Research

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Precise pre-and postoperative anatomic measurements are necessary to plan, perform, and evaluate total knee arthroplasty (TKA). We evaluated the relationship between radiographic and navigation alignment measurements, identified sources of error in radiographic and navigated alignment assessment, and determined the differences between desired and clinically accepted alignment. Fifty-eight computer-assisted TKAs were performed and limb alignment measurements were recorded both pre-and postoperatively with standard radiographs and with an intraoperative navigation system. Intraoperative navigation produced consistent navigation-generated alignment results that were within 1°of the desired alignment. The difference between preoperative radiographic and navigation measurements varied by as much as 12°and the difference between postoperative radiographic and navigation measurements varied by as much as 8°. This discrepancy depended on the degree of limb deformity. Postoperative radiographic measurements have inherent limitations. Navigation can generate precise, accurate, and reproducible alignment measurements. This technology can function as an effective tool for assessing pre-and postoperative limb alignment and relating intraoperative alignment measurements to clinical and functional outcomes. Level of Evidence: Level II, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

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A quantitative approach to radiography of the lower limb. Principles and applications

Cited by 130 publications

References 0 publications

Long-term Results With a Lateral Unicondylar Replacement

Long-term Results With a Lateral Unicondylar Replacement

Knee and hip kinetics during normal stair climbing

Radiographic and Navigation Measurements of TKA Limb Alignment Do Not Correlate

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