Acumed Anatomic Radial Head
Long Stem Solution
The Acumed Anatomic Radial Head Solution is designed to provide an anatomic implant to replace the patient’s native radial head.
Designed in conjunction with Shawn W. O’Driscoll, Ph.D., M.D., the system includes 290 head and stem combinations including standard stems, long stems, an anatomically shaped radial head, and system-specific instrumentation to help streamline the surgeon’s experience in the operating room.
In addition to the Anatomic Radial Head Solution, 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.
The First and Only Anatomic Radial Head
Originally released in 2006, the prosthesis has been used in thousands of radial head procedures over multiple system generations and product line improvements. More than a decade of research and experience has influenced key refinements to the anatomic properties of the prosthesis.
New Anatomic Design Features
- Contouring of the medial side of the head has been further defined to track against the radial notch of the ulna.2
- The dish depth increases with head diameter, which is designed to help improve radiocapitellar wear characteristics over the current-generation Acumed Adnatomic Radial Head.1
- The implant’s medial surface is contoured to better replicate the lateral trochlear ridge facet, which may help avoid cartilage erosion.2
- With the annular ligament in mind, a more defined S-shaped contour has been added to the lateral side of the radial head prosthesis.
1. Bachman DR, Thaveepunsan S, Park S, Fitzsimmons JS, An KN, O’Driscoll SW.2015, ‘The effect of prosthetic radial head geometry on the distribution and magnitude of radiocapitellar joint contact pressures’, Journey of Hand Surgery America, vol.40, no.2, pp. 281-288
2. Sahu D, Holmes DM, Fitzsimmons JS, Thoreson AR, Berglund LJ, An KU, O’Driscoll SW 2014, ‘Influence of radial head prosthesis design on radiocapitellar joint contact mechanics’, Journal of Shoulder Elbow Surgery, vol.23, no.4, pp. 456-462
Anatomic Radial Head Solutions Product Family
Explore the Anatomic Radial Head Solutions Product Family
Anatomic Radial Head
1. 20–28 mm left and right specific heads.
2. The dish depth increases with head diameter, which is designed to help improve radiocapitellar wear characteristics over the previous generation Anatomic Radial Head.1,2
3. The implant’s medial surface is contoured to better replicate the lateral trochlear ridge facet, which may help avoid cartilage erosion.2
4. Contouring of the medial side of the head has been further defined to track against the lateral side of the ulna.2
5. With the annular ligament in mind, an S-shaped contour was built into the lateral side of the radial head prosthesis.
1. Hashed Laser Marks: 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.
2. Partially Grit Blasted Stems: Intended to promote proximal bony ongrowth.
3. Resection Length: Four long stems accommodate resection lengths from 19mm to 28mm. The Long Stem Resection Guide is used to measure the length of resection, which corresponds to stem diameter.
4. Insertion Depth Laser Mark: Corresponds to the stem diameter and proper insertion depth based on equivalent level of resection.
5. Stem Length: Four long stems range from 50mm to 65mm in length (5mm increments) and 6mm to 12mm in diameter (2mm increments).
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.
Stem Removal Tools – The ARH Removal Tool Shaft threads into standard and long stems to aid in stem removal during primary or revision surgery. The Cross Bar may be inserted through the ARH Removal Tool Shaft handle and be used as a surface for tapping the stem out with a mallet.
Radius Retractor – Designed to help elevate the radius, this tool may assist during reaming, trialing, and insertion of the implant.