Limits...
Evaluation of a computational model to predict elbow range of motion.

Willing RT, Nishiwaki M, Johnson JA, King GJ, Athwal GS - Comput. Aided Surg. (2014)

Bottom Line: The model was validated against experimental results with a cadaveric specimen, and was able to predict the flexion and extension limits of the intact joint to 0° and 3°, respectively.The model was also able to predict the flexion and extension limits to 1° and 2°, respectively, when simulated osteophytes were inserted into the joint.Future studies based on this approach will be used for the prediction of elbow flexion-extension ROM in patients with primary osteoarthritis to help identify motion-limiting hypertrophic osteophytes, and will eventually permit real-time computer-assisted navigated excisions.

View Article: PubMed Central - PubMed

Affiliation: Bioengineering Research Laboratory, The Hand and Upper Limb Centre, Lawson Health Research Institute, St. Joseph's Health Care London , London , Ontario .

ABSTRACT
Computer models capable of predicting elbow flexion and extension range of motion (ROM) limits would be useful for assisting surgeons in improving the outcomes of surgical treatment of patients with elbow contractures. A simple and robust computer-based model was developed that predicts elbow joint ROM using bone geometries calculated from computed tomography image data. The model assumes a hinge-like flexion-extension axis, and that elbow passive ROM limits can be based on terminal bony impingement. The model was validated against experimental results with a cadaveric specimen, and was able to predict the flexion and extension limits of the intact joint to 0° and 3°, respectively. The model was also able to predict the flexion and extension limits to 1° and 2°, respectively, when simulated osteophytes were inserted into the joint. Future studies based on this approach will be used for the prediction of elbow flexion-extension ROM in patients with primary osteoarthritis to help identify motion-limiting hypertrophic osteophytes, and will eventually permit real-time computer-assisted navigated excisions.

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Related in: MedlinePlus

Simulated osteophytes made from harvested cortical bone were affixed to the anterior and posterior surface of the distal humerus. The simulated osteophytes were positioned such that they would partially obstruct the coronoid and olecranon fossae and impinge with the coronoid and olecranon tips during flexion and extension motions, respectively.
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f2: Simulated osteophytes made from harvested cortical bone were affixed to the anterior and posterior surface of the distal humerus. The simulated osteophytes were positioned such that they would partially obstruct the coronoid and olecranon fossae and impinge with the coronoid and olecranon tips during flexion and extension motions, respectively.

Mentions: (c) Osteophyte: Rectangular cortical bone blocks measuring approximately 20 mm × 60 mm × 5 mm were harvested from the humeral shaft of another cadaveric specimen. An orthopaedic oscillating saw was used to shape the bone blocks into simulated anterior and posterior osteophytes, which were then affixed to the anterior and posterior surfaces of the distal humerus using imaging-compatible nylon nuts and bolts, such that the olecranon and coronoid fossae were partially obstructed (Figure 2).


Evaluation of a computational model to predict elbow range of motion.

Willing RT, Nishiwaki M, Johnson JA, King GJ, Athwal GS - Comput. Aided Surg. (2014)

Simulated osteophytes made from harvested cortical bone were affixed to the anterior and posterior surface of the distal humerus. The simulated osteophytes were positioned such that they would partially obstruct the coronoid and olecranon fossae and impinge with the coronoid and olecranon tips during flexion and extension motions, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4269151&req=5

f2: Simulated osteophytes made from harvested cortical bone were affixed to the anterior and posterior surface of the distal humerus. The simulated osteophytes were positioned such that they would partially obstruct the coronoid and olecranon fossae and impinge with the coronoid and olecranon tips during flexion and extension motions, respectively.
Mentions: (c) Osteophyte: Rectangular cortical bone blocks measuring approximately 20 mm × 60 mm × 5 mm were harvested from the humeral shaft of another cadaveric specimen. An orthopaedic oscillating saw was used to shape the bone blocks into simulated anterior and posterior osteophytes, which were then affixed to the anterior and posterior surfaces of the distal humerus using imaging-compatible nylon nuts and bolts, such that the olecranon and coronoid fossae were partially obstructed (Figure 2).

Bottom Line: The model was validated against experimental results with a cadaveric specimen, and was able to predict the flexion and extension limits of the intact joint to 0° and 3°, respectively.The model was also able to predict the flexion and extension limits to 1° and 2°, respectively, when simulated osteophytes were inserted into the joint.Future studies based on this approach will be used for the prediction of elbow flexion-extension ROM in patients with primary osteoarthritis to help identify motion-limiting hypertrophic osteophytes, and will eventually permit real-time computer-assisted navigated excisions.

View Article: PubMed Central - PubMed

Affiliation: Bioengineering Research Laboratory, The Hand and Upper Limb Centre, Lawson Health Research Institute, St. Joseph's Health Care London , London , Ontario .

ABSTRACT
Computer models capable of predicting elbow flexion and extension range of motion (ROM) limits would be useful for assisting surgeons in improving the outcomes of surgical treatment of patients with elbow contractures. A simple and robust computer-based model was developed that predicts elbow joint ROM using bone geometries calculated from computed tomography image data. The model assumes a hinge-like flexion-extension axis, and that elbow passive ROM limits can be based on terminal bony impingement. The model was validated against experimental results with a cadaveric specimen, and was able to predict the flexion and extension limits of the intact joint to 0° and 3°, respectively. The model was also able to predict the flexion and extension limits to 1° and 2°, respectively, when simulated osteophytes were inserted into the joint. Future studies based on this approach will be used for the prediction of elbow flexion-extension ROM in patients with primary osteoarthritis to help identify motion-limiting hypertrophic osteophytes, and will eventually permit real-time computer-assisted navigated excisions.

Show MeSH
Related in: MedlinePlus