This page provides specifications of knee specimen OKS001. This is a (possibly osteoarthritic) elderly male specimen candidate.

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Specimen Characteristics

Right knee

Gender: Male

Age: 71 years

Race: White

Height: 1.83 m

Weight: 77.1 kg

BMI: 23.1

Serologically tested: Yes

X-Ray:

Experimentation

-- ["aerdemir"] DateTime(2014-10-06T13:35:28Z) All, please complete relevant sections of this page during and after experimentation.

Specimen

Reference Specification: ["Specifications/Specimens"] - [http://wiki.simtk.org/openknee/Specifications/Specimens?action=recall&rev=40 Revision as of October 5, 2014]

Leading Team Member: Snehal Chokhandre

Supporting Team Members: Ahmet Erdemir

Timeline: October 5, 2014

Data Location: In this page.

Protocol Deviations:

  1. None.

Notes:

  1. None.

Specimen Preparation

Reference Specification: ["Specifications/SpecimenPreparation"] - [http://wiki.simtk.org/openknee/Specifications/SpecimenPreparation?action=recall&rev=124 Revision as of October 6, 2014]

Leading Team Member: Tara Bonner

Supporting Team Members: Snehal Chokhandre, Craig Bennetts, Robb Colbrunn, Eryn Merico

Timeline: Thawing: 12:30 PM October 5, 2014 - 10:00 AM October 6, 2014; Dissection: 11:30 AM - ~ 1:30 PM October 6, 2014 (specimen need to thaw for another hour); Assembly of Optotrak base plugs ; Assembly of Registration Markers; Probing of Anatomical Landmarks; Probing of Registration Markers.

Data Location: On this page

Protocol Deviations:

  1. Quadriceps tendon was prepared (specifically its suturing) during the initial preparation.
  2. 1. Registration Markers - Digitization. Digitization order for femur spherical markers are: 1 - anteromedial, 2 - medial, 3 - lateral. Digitization order for tibia spherical markers are: 1 - lateral, 2 - medial, 3 - posterior. Note that the order of digitization for tibia markers is a deviation from the specifications. Nonetheless, this order is the same for oks004. THIS IS A CANDIDATE FOR UPDATING THE SPECIFICATIONS FOR ALL REMAINING SPECIMENS.
  3. Femur and tibia was cut 7.5 inches from the epicondylar line (rather than 8 for femur, 7 for tibia) THIS IS A CANDIDATE FOR UPDATING THE SPECIFICATIONS FOR ALL REMAINING SPECIMENS.

Notes:

  1. Plastic screws for registration markers are #8-32 (drill bit diameter 0.136 (for tapping), tap size #8-32, drill wire gage 29), need to include this in the specifications.
  2. Brass screws for base plugs are #3 (use drill bit diameter ~.088 in, no tapping), need to include this in the specifications.
  3. Patella Optotrak base plug orientation was not specified in specifications; two screw holes should be on the inferior side, need to include this in the specifications.
  4. The order of probing divots on the patella registration marker assembly was not documented in specifications, need to include this in the specifications.

Joint Imaging

Specimen Preparation

Reference Specification: ["Specifications/SpecimenPreparation"] - [http://wiki.simtk.org/openknee/Specifications/SpecimenPreparation?action=recall&rev=124 Revision as of October 6, 2014]

Leading Team Member: Craig Bennetts

Supporting Team Members: Snehal Chokhandre

Timeline: 8.30 am, October 7,2014 - 9.30 am, October 7,2014

Data Location:

Protocol Deviations:

  1. The posterior region of the knee was dissected further (removal of skin, fat, and muscle layers) to allow fitting of the whole specimen and the patellafemoral registration marker assembly in the transportation fixture (therefore the knee coil of the MRI).

Notes:

  1. The tibia end of foam to secure the tibia during transportation and imaging had to be cut lower to accommodate fitting of the whole specimen and the patellofemoral registration marker assembly in the transportation fixture (therefore the knee coil of the MRI).

Imaging

Reference Specification: ["Specifications/ExperimentationAnatomicalImaging"]

Leading Team Member: Craig Bennetts

Supporting Team Members: Snehal Chokhandre, Sam Doerle

Timeline: 10.00 am-12.00 am, October 7, 2014

Data Location:

Protocol Deviations:

  1. None

Notes:

Joint Mechanics

Equipment Preparation

Reference Specification: ["Specifications/PressureCalibration"] - [http://wiki.simtk.org/openknee/Specifications/PressureCalibration?action=recall&rev=16 Revision as of October 6, 2014]

Leading Team Member: Robb Colbrunn

Supporting Team Members: Ahmet Erdemir

Timeline: October 6, 2014 (Equilibration: 10:20 AM - 11:20 AM; Calibration: 11:30 AM - 12:30 PM)

Data Location:

Protocol Deviations:

Notes:

  1. C-Line lamination sheet was used to seal the sensor. Put one sheet with sticky side up, roll the sensor over it. Put another sheet with sticky side up, roll the sensor+sheet over it. Trim edges.
  2. For equilibration: 5051-P1-11111DT1-1200
  3. For equilibration: 6.35 Bars (maximum possible).
  4. Need to change data storage information in equilibration to reflect the workflow.
  5. Equilibration file (2-pass) name 5051-P1-11111DT1-1200_10-6-14_6 bar.equ. (available in oks001/configuration folder of the pressure sensor data collection computer.
  6. During calibration, the use of 2-pass equilibration file was problematic. Second pass was deleted from the file and a new equilibration file was created 5051-P1-11111DT1-1200_10-6-14_6 bar-single_pass.equ, which was used in calibration.
  7. Pre-testing calibration file name 5051-P1-11111DT1-1200_10-6-14_6 bar.equ. (available in oks001/configuration folder of the pressure sensor data collection computer.

Specimen Preparation

Reference Specification:

Leading Team Member: Tara Bonner

Supporting Team Members: Robb Colbrunn

Timeline: Oct. 7 12:30-2:30

Data Location:

Protocol Deviations:

Notes:

Testing

Reference Specification: ["Specifications/ExperimentationJointMechanics"] - [http://http://wiki.simtk.org/openknee/Specifications/ExperimentationJointMechanics?highlight=(Specifications) http://http://wiki.simtk.org/openknee/Specifications/ExperimentationJointMechanics?highlight=%28Specifications%29]

Leading Team Member: Tara Bonner

Supporting Team Members: Robb Colbrunn

Timeline: Tibiofemoral (Oct. 7, 2:30-5:30), Patellofemoral (Oct. 8, 11:00-12:45)

Data Location:

Protocol Deviations:

Notes:

  1. Used a 10 second hold for Varus/Valgus torque and Ant/Post drawer (in laxity testing)
  2. Used a 14 second hold for Int/Ext rotation torque (in laxity testing)

Tissue Mechanics

Specimen Preparation

Reference Specification:

Leading Team Member:

Supporting Team Members:

Timeline:

Data Location:

Protocol Deviations:

Notes:

Testing

Reference Specification:

Leading Team Member:

Supporting Team Members:

Timeline:

Data Location:

Protocol Deviations:

Notes:

Data Analysis

Pictured below are the Anterior Posterior laxity graph, IR/ER laxity graph, and the Varus/Valgus laxity graph.

attachment:oks001_1LaxitGraphs.png

Modeling & Simulation