Type II lunate with hamatolunate impingement
Ulnar-sided wrist pain
Type II lunate
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There is a small facet between the lunate and the tip of the hamate, with abnormally decreased T1 and increased T2 signal in the proximal hamate.
2 case question available
Approximately half of all wrists have the "type II" lunate configuration, with an extra facet between the lunate and the hamate.
This configuration may lead to altered wrist mechanics, accelerated cartilage loss at the facet, and the eventual development of impingement and pain. A type II lunate is in the differential of ulnar sided wrist pain and MRI can nicely show bone marrow edema from impingement.
- 1. Morrison WB, Sanders TG. Problem solving in musculoskeletal imaging. Mosby. ISBN:0323040349. Read it at Google Books - Find it at Amazon
- 2. 1. Malik AM, Schweitzer ME, Culp RW et-al. MR imaging of the type II lunate bone: frequency, extent, and associated findings. AJR Am J Roentgenol. 1999;173 (2): 335-8. doi:10.2214/ajr.173.2.10430130 - Pubmed citation