0106 - ANATOMICAL VARIATIONS IN THE DISTAL FEMUR? A CT DATA ANALYSIS OF 24,042 KNEES

Based on a large quantity of CT data, variations in distal femoral geometry was examined and evaluated for TKA. A retrospective study was performed on 24,042 data sets generated during the process of designing individual knee implants. Following parameters were recorded for the distal femur: Femoral absolute anterior-posterior (AP) and medial-lateral (ML) extent, lateral and medial condyle and trochlea size, distal condylar offset (DCO) between lateral and medial condyle, and the difference between medial and lateral posterior condylar offset (PCO) measured in AP direction. Variable patient geometry was found with analysis of the AP and ML extent. Approximately one-third of the patients would experience size conflicts of +/- 3 mm with standard arthroplasty systems. 62% of the knees had a DCO> 1 mm. 83% of the distal femur had a mediolateral difference in PCO> 2 mm, which corresponds to about 3° external rotation and does not correlate with the femoral size. There is a distinct variability of femoral AP and ML extent as well as offsets / asymmetries. Medial and lateral PCOs are different and do not correlate with femoral size. This first results in mismatches between size of implant and individual knee anatomy and secondly in possible softtissue release and different femoral external rotations to adapt systems with fixed distal geometry to the individual situation.

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Integration and Data Analysis of Conventional Core Data with NMR and CT Data to Characterize An Evaporitic Carbonate Reservoir.

10.2118/183145-ms ◽

2016 ◽

Cited By ~ 1

Author(s):

Daniel Fitzsimons ◽

Gunnar Oeltzschner ◽

Christopher Ovens ◽

Dirk Radies ◽

Frauke Schulze

Keyword(s):

Data Analysis ◽

Carbonate Reservoir ◽

Core Data ◽

Ct Data

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High variability of proximal tibial asymmetry and slope: a CT data analysis of 15,807 osteoarthritic knees before TKA

Knee Surgery Sports Traumatology Arthroscopy ◽

10.1007/s00167-019-05728-4 ◽

2019 ◽

Vol 28 (4) ◽

pp. 1105-1112 ◽

Cited By ~ 3

Author(s):

Malin Meier ◽

Sumesh Zingde ◽

Raymond Best ◽

Lennart Schroeder ◽

Johannes Beckmann ◽

...

Keyword(s):

Data Analysis ◽

High Variability ◽

Ct Data

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Topographical CT-data analysis of the human orbital floor

International Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.ijom.2006.07.013 ◽

2007 ◽

Vol 36 (1) ◽

pp. 45-53 ◽

Cited By ~ 36

Author(s):

M.C. Metzger ◽

R. Schön ◽

R. Tetzlaf ◽

N. Weyer ◽

A. Rafii ◽

...

Keyword(s):

Data Analysis ◽

Orbital Floor ◽

Ct Data

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Magnesium Sulfate Does Not Increase Ventricular Cerebrospinal Fluid Ionized Magnesium Concentration in Patients with Intracranial Hypertension

Stroke ◽

10.1161/str.32.suppl_1.375-a ◽

2001 ◽

Vol 32 (suppl_1) ◽

pp. 375-375

Author(s):

Randall P Brewer ◽

Augusto Parra ◽

Michael B Hopkins ◽

Cecil O Borel ◽

James R Reynolds

Keyword(s):

Cerebrospinal Fluid ◽

Data Analysis ◽

Subarachnoid Hemorrhage ◽

Intracranial Hypertension ◽

Magnesium Sulfate ◽

Closed Head Injury ◽

Magnesium Concentration ◽

Closed Head ◽

Ct Data ◽

Post Hoc

P197 Background: Magnesium sulfate (MgSO4) has attracted interest as a neuroprotective agent during cerebral ischemia. Passage of Mg ion into the CNS has been poorly examined. The present study assessed the passage of ionized (physiologically-active)Mg into the cerebrospinal fluid (CSF) of patients with intracranial hypertension after MgSO4 infusion. Design: After IRB approval, patients requiring CSF drainage received IV MgSO 4 (5g)in 125 cc NS over 30 min. Plasma and CSF samples were taken hourly for 4 hrs. Intraventricular catheter placement was confirmed by CT. Data analysis involved ANOVA followed by Dunnet’s post hoc test for a significant F statistic (p < 0.05). Results: Nine patients (5/4, male/female; mean age=52) with closed head injury (n=3), subarachnoid hemorrhage (n=2), intracerebral hemorrhage (n=2), hydrocephalus (n=1), and subdural hematoma (n=1) were studied. Mean (±SD)Mg values are presented (table). Baseline Mg was higher in CSF. Although plasma Mg increased, CSF Mg was unchanged. Conclusions: Although the CSF to plasma Mg gradient is maintained in patients with intracranial hypertension, intravenous infusion of 5g MgSO4 does not further increase CSF Mg. This suggests systemic infusion of MgSO4 may not be an effective route of administration for neuroprotection.

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