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- W2566071406 abstract "Purpose: Ligaments and osseous constraints are the only static stabilizers in a healthy elbow. Following arthroplasty, the use of semi-constrained, or linked, implants provides a potential third static stabilizer. However, this constraint may increase loading on the prosthesis, and hence accelerate polyethylene wear. The presence of competent collateral ligaments and the radial head would be expected to improve elbow stability and decrease loading on the ulnohumeral articulation. This in vitro study determined the effects of the collateral ligaments, radial head, and implant linkage on kinematics and wear-inducing loads in total elbow arthroplasty. Method: Eight cadaveric upper extremities (age 73.5yrs; 5 male), were tested using an elbow motion simulator. Humeral, ulnar, and radial components of an elbow arthroplasty were positioned using a computer-assisted technique. Varus-valgus and internal-external bending loads were measured during flexion using an instrumented humeral component. A tracking receiver attached to the ulna recorded its position during active and passive flexion in the vertical orientation, and passive flexion in the varus and valgus orientations. Kinematics and loading were measured with and without implant linkage, with an intact, resected and replaced radial head, and before and after sectioning of the collateral ligaments. Results: There were no differences in the bending loads with the arm in the vertical orientation regardless of the status of the ligaments, radial head or implant linkage (p>0.2). Radial head excision produced an increase in valgus angulation of the ulna (6.7±6.4°) but did not influence bending loads in the vertical orientation (p Conclusion: Our results show that the radial head is an important valgus stabilizer for the prosthesis employed in this investigation. Linkage of the articulation increases implant loading during passive flexion with the arm in the varus and valgus orientations, which may increase implant wear. This suggests that, when using prostheses of this design, linkage of the articulation may be unnecessary if adequate bone stock and ligaments are available, whilst preserving or repairing the collateral ligaments and preserving or replacing the radial head." @default.
- W2566071406 created "2017-01-06" @default.
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- W2566071406 date "2010-03-01" @default.
- W2566071406 modified "2023-09-24" @default.
- W2566071406 title "PAPER 063: THE EFFECT OF IMPLANT LINKAGE, COLLATERAL LIGAMENT SECTIONING AND RADIAL HEAD MANAGEMENT ON THE KINEMATICS AND LOADING IN TOTAL ELBOW ARTHROPLASTY" @default.
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