Chuang Donald P, Elue John, Schraut Nicholas, Mossad David, Castillo Tafur Julio C, Gonzalez Mark H
University of Illinois Chicago, USA.
Hand (N Y). 2024 Aug 14:15589447241270668. doi: 10.1177/15589447241270668.
The Linburg-Comstock (LC) anomaly is a common tendinous connection between the flexor pollicis longus and flexor digitorum profundus (FDP), most frequently to the FDP of the index finger. The purpose of this study was to obtain epidemiologic data on the LC anomaly in a healthy, ethnically diverse population and to study the effect of the LC anomaly on grip strength, tip pinch strength, key pinch strength, and chuck pinch strength.
We examined 500 healthy subjects (292 females and 208 males) bilaterally for the presence of the LC anomaly. Each subject had their grip strength, tip pinch strength, key pinch strength, and chuck pinch strength measured bilaterally using a dynamometer for grip strength and a pinch meter for all pinch strength measurements.
The LC anomaly was present in 213 of the 500 subjects (43%). One hundred one subjects (47%) had a unilateral presentation, and 112 (53%) subjects had a bilateral presentation. The LC anomaly was associated with a weaker tip pinch strength. When examining the LC anomaly among different ethnic groups, the highest prevalence was found in the Hispanic (57%) population followed by Caucasian (50%), Asian (41%), and African American (31%) populations.
The LC anomaly has different prevalence according to ethnicity, with a higher prevalence in the Hispanic and Caucasian populations and a lower overall prevalence in the African American populations. The LC anomaly can also result in weaker tip pinch strength.
林堡 - 康斯托克（LC）异常是拇长屈肌与指深屈肌（FDP）之间常见的腱性连接，最常见于与示指的指深屈肌相连。本研究的目的是获取健康、种族多样化人群中LC异常的流行病学数据，并研究LC异常对握力、指尖捏力、钥匙捏力和夹捏力的影响。
我们对500名健康受试者（292名女性和208名男性）双侧检查是否存在LC异常。使用握力计双侧测量每位受试者的握力，使用捏力计双侧测量所有捏力（指尖捏力、钥匙捏力和夹捏力）。
500名受试者中有213名（43%）存在LC异常。101名受试者（47%）为单侧出现，112名（53%）受试者为双侧出现。LC异常与较弱的指尖捏力有关。在不同种族群体中检查LC异常时，发现西班牙裔人群的患病率最高（57%），其次是白种人（50%）、亚洲人（41%）和非裔美国人（31%）。
LC异常的患病率因种族而异，在西班牙裔和白种人群体中患病率较高，在非裔美国人群体中总体患病率较低。LC异常也可能导致较弱的指尖捏力。
