An anatomical study of additional radial wrist extensors including a unique extensor carpi radialis accessorius

作者：West C T^*; Ricketts D; Brassett C

来源：Folia Morphologica, 2017, 76(4): 742-747.

DOI：10.5603/FM.a2017.0047

• extensor carpi radialis brevis
• extensor carpi radialis longus
• extensor carpi radialis accessorius
• extensor carpi radialis intermedius

Background: In this study, 82 forearms from 41 cadavers were dissected to establish the incidence of variant additional radial wrist extensors. Three variants have been described in the literature: extensor carpi radialis intermedius (ECRI), extensor carpi radialis accessorius (ECRA) and extensor carpi radialis tertius (ECRT).
Materials and methods: Of the 41 cadavers studied, 5/41 (12%) had an additional radial wrist extensor. Of these 5 individuals, 2 had bilateral additional muscles and 3 were unilateral. Of the 82 forearms, 7/82 (9%) had additional radial wrist extensors.
Results: We found 4 examples of ECRI and 3 examples of ECRA. We did not find any examples of ECRT. One specimen of ECRA had an atypical, previously undescribed, course.
Conclusions: These accessory muscles are of clinical relevance, as they may be a contributing factor in tennis elbow and nerve entrapment, or cause diagnostic confusion, especially in ultrasound scans. However, they may also be used for tendon transfer. Of the 7 muscles found in the current study, 3 would have been suitable for such procedures.

• 出版日期2017