West C T, Ricketts D, Brassett C
University of Cambridge.
Brighton and Sussex University Hospitals NHS Trust.
Folia Morphol (Warsz). 2017;76(4):742-747. doi: 10.5603/FM.a2017.0047. Epub 2017 May 29.
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).
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.
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.
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.
在本研究中，对41具尸体的82条前臂进行了解剖，以确定桡侧腕伸肌变异的发生率。文献中描述了三种变异：桡侧中间腕伸肌（ECRI）、副桡侧腕伸肌（ECRA）和第三桡侧腕伸肌（ECRT）。
在研究的41具尸体中，5/41（12%）有额外的桡侧腕伸肌。在这5个人中，2人双侧有额外肌肉，3人单侧有。在82条前臂中，7/82（9%）有额外的桡侧腕伸肌。
我们发现了4例ECRI和3例ECRA。未发现ECRT的病例。1例ECRA标本有一条非典型的、以前未描述过的走行。
这些副肌具有临床相关性，因为它们可能是网球肘和神经卡压的一个促成因素，或者导致诊断混淆，尤其是在超声扫描中。然而，它们也可用于肌腱转移。在本研究中发现的7块肌肉中，有3块适合进行此类手术。
