Radial Head Plate. Home > Resources > Images > Radial Head Plate. Acumed Radial Head Plating System – On Bone T: ; E: [email protected] Acumed’s Locking Radial Head Plate System provides an innovative and improved method for the treatment of fractures where the radial head. The Acumed Anatomic Radial Head System is designed to provide an 2 Mini and Micro instruments and the Locking Radial Head Plate System at the base of .
|Published (Last):||12 March 2015|
|PDF File Size:||19.47 Mb|
|ePub File Size:||18.22 Mb|
|Price:||Free* [*Free Regsitration Required]|
Standard length stems range from 6—10 mm in diameter in 1 mm increments and 0—8 mm heights in 2-mm incrementsand are fully grit-blasted to promote bony ongrowth.
The standard stems accommodate a resection window of 9 mm—17 mm. For very distal fractures or revision cases, the long stems range from 6—12 mm in diameter in 2 mm incrementsand have 50 mm—65 mm length options in 5 mm increments. These stems accommodate a resection window of 19 radiao mm. Several biomechanical studies have discussed the potential long-term value of an anatomically shaped radial head prosthesis.
Heads range from 20—28 mm in diameter in 2-mm increments. The Acumed Anatomic Radial Head System is designed to provide an anatomic implant to replace the patient’s native radial head.
Designed in conjunction with Shawn W. In addition to the Anatomic Radial Head System, the set may include the Acutrak 2 Mini and Micro instruments and the Locking Radial Head Plate System at the base of the tray to provide multiple solutions all in one set.
Comminuted radial head fractures treated by the Acumed anatomic radial head system
These were significantly greater with symmetrical circular prostheses than with asymmetrical elliptical designs. The prosthesis that best mimicked native contact behavior was the anatomical radial head prototype 2 [ARH Solutions] owing radila its design for articulating with the capitellum, the lateral trochlear ridge, and the sulcus between. Methods Three commercially available circular radial head designs were compared with an anatomical radial head and 2 modified anatomical prototype radial head designs in 10 cadaveric specimens.
Each prosthesis and specimen combination was loaded in neutral rotation and maximal extension with a custom testing apparatus while measuring contact areas and pressures using thin-film pressure sensors. Results Anatomical radial head prototype 2 had similar radiocapitellar contact areas and hear pressures as the native radial head; all achmed designs showed significant decreases in contact area and increased mean pressures.
Peak contact pressures were also measured and were significantly elevated with all prostheses tested. Anatomical designs are statistically more likely to mimic normal contact with the lateral trochlear ridge and its adjacent sulcus than circular prostheses. They are also significantly less likely to have contact pressures above the 5 MPa threshold that is thought pate be harmful to cartilage.
Radial Head Plating System
The depth of the articular dish had a significant effect on contact area and pressure. Conclusion Commercially available radial head prostheses demonstrated reduced radiocapitellar contact areas and elevated contact pressures during compressive loading. The prosthesis that best mimicked native contact behavior was the anatomical radial head prototype 2 owing to its design for articulating with the capitellum, the lateral trochlear ridge, and the sulcus between.
The effect of prosthetic radial head geometry on the distribution and magnitude of radiocapitellar joint contact pressures. J Hand Surg Am. By use of a thin flexible pressure transducer, contact pressures and areas were measured for the native radial head, an anatomic implant, a nonanatomic circular monopolar implant, and a bipolar nonanatomic implant.
Results The mean contact areas for the prosthetic radial heads were significantly less than those seen with adumed intact radial heads at every angle tested P Conclusion The geometry hexd radial head implants strongly influences their contact characteristics.
In a direct radius-to-capitellum axial loading experiment, an anatomically designed radial head prosthesis had lower and more evenly distributed contact pressures than the nonanatomic implants that were tested. Influence of radial head prosthesis design on radiocapitellar joint contact mechanics.
J Shoulder Elbow Surg. However, it is typically minor, nonprogressive, and of questionable clinical consequence. We hypothesized that stress shielding around radial head prostheses is common but nonprogressive.
In this study, we present a classification scheme to support our radiographic observations. Methods We reviewed charts and radiographs of 86 cases from 79 patients with radial head implants from both primary and revision surgeries between and Exclusion criteria included infection, loosening, or follow-up of less than 12 months.
We classified stress shielding as: We saw stress shielding with all stem types: Ardial average follow-up rzdial 33 months range, mo. Stress shielding was radia by an average of 11 months range, mo. The 3 cases with circumferential exposure of the stem stage IIb averaged 2.
Radial Head Plate | Acumed
Stress shielding never extended to the bicipital tuberosity, and there were no cases of impending mechanical failure.
Conclusion Stress shielding around radial head prostheses is common, regardless of stem design. Stress shielding around radial head prostheses.
Published by Elsevier, Inc. More than a decade of research and experience has influenced key refinements to the anatomic properties of the prosthesis. Contouring of the medial side of the head has been further defined to track against the lateral side of the ulna. The dish depth increases with head diameter, which is designed to help improve radiocapitellar wear characteristics over the current-generation Acumed Anatomic Radial Head.
The dish depth increases with head diameter, which is designed to help improve radiocapitellar wear characteristics over the previous generation Anatomic Radial Head. With the annular ligament in mind, an S-shaped contour was built into the lateral side of the radial head prosthesis. Indicate proper alignment with the lateral aspect of the radius when the forearm is in neutral position.
Lister’s tubercle may also be used as a landmark for laser mark orientation. Four long stems accommodate resection lengths from 19 mm to 28 mm. The Long Stem Resection Guide is used to measure the length of resection, which corresponds to stem diameter. Insertion Depth Laser Mark: Corresponds to the stem diameter and proper insertion depth based on equivalent level of resection. Four long stems range from 50 mm to 65 mm in length 5 mm increments and 6 mm to 12 mm in diameter 2 mm increments.
Radius Retractor – Designed to help elevate the radius, this tool may assist during reaming, trialing, and insertion of the implant. Combinations head and stem combinations. Standard Length Stems Standard length stems range from 6—10 mm in diameter in 1 mm increments and 0—8 mm heights in 2-mm incrementsand are fully grit-blasted to promote bony ongrowth. Long Stems For very distal fractures or revision cases, the long stems range from 6—12 mm in diameter in 2 mm incrementsand have 50 mm—65 mm length options in 5 mm increments.
Product Overview The Acumed Anatomic Radial Head System is designed to provide an anatomic implant to replace the patient’s native radial head. In addition to citing existing scholarly papers, we conduct ongoing clinical research and use this information for validation and continuous improvement to deliver the greatest value to our customers.
Journal Abstract Objective To determine if radiocapitellar contact pressures would be elevated with nonanatomical circular prostheses over those mimicking native anatomy and if such pressures would be related to the depth and contour of the articular dish and to the pattern of prosthetic articulation against the lateral trochlear ridge. Journal Abstract Hypothesis Our aim was to test whether anatomically designed metallic radial head implants could better reproduce native radiocapitellar contact pressure and areas than nonanatomic implants.
Journal Abstract Objective Stress shielding is known to occur around rigidly fixed implants. The First and Only Anatomic Radial Head Originally released inthe prosthesis has been used in thousands of radial head procedures over multiple system generations and product line improvements.
New Anatomic Design Features Contouring of the medial side of the head has been further defined to track against the lateral side of the ulna. Partially Grit Blasted Stems: Intended to promote proximal bony ongrowth. The Anatomic Radial Head System has evolved from the use of broaches to that of reamers for canal preparation.
Reamers allow for a 1 mm larger stem diameter and may decrease risk of iatrogenic fractures of the radius compared to broaches.
Click Here to Request More Information. Email Updates Yes, please send me updates by email.