Anatomy, Shoulder and Upper Limb, Osborne Band


Article Author:
Tierra Range


Article Editor:
Navdeep Samra


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Abdul Waheed
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Navid Mahabadi
Steve Bhimji
John Shell
Matthew Varacallo
Ahmad Malik
Mark Pellegrini
James Hughes
Beata Beatty
Hajira Basit
Phillip Hynes


Updated:
12/19/2018 4:19:02 PM

Introduction

The most notable structure located on the medial aspect of the elbow is the cubital tunnel, through which the ulnar nerve passes. The walls creating the tunnel include the olecranon and the medial epicondyle, while the joint capsule of the elbow and the transverse and posterior bands of the medial ulnar collateral ligament form the floor, and finally the roof is comprised of the fascia of the flexor carpi ulnaris muscle and Osborne’s band, and referred to as Osborne's fascia. Due to its location and function, Osborne’s fascia is of significance predominantly due to its potential to compress the ulnar nerve in the elbow.

Structure and Function

Osborne’s band is a fibrous band of tissue that connects the two heads of the flexor carpi ulnaris muscle, thereby forming the roof of the cubital tunnel. It extends from the middle of the olecranon to the top of it and has a width span of approximately 4 mm.[1]  A study showed that the length of this band and therefore the distance between the heads of the flexor carpi ulnaris muscle is increased with elbow flexion although the degree to which the elbow must be flexed to cause these findings varies between people. Although important clinically in the pathology of certain conditions such as ulnar neuritis and Ehler’s Danlos, Osborne’s band is not a necessary tissue for functionality – various studies have revealed its congenital absence in 10-23% of subjects tested. It is not present in all individuals, with studies showing that the number of people with Osborne’s band being 77-100% of patients.  It is often implicated in ulnar nerve compression and surgically transected to decompress the ulnar nerve in this area of the elbow.

Muscles

Tendons of the cubital tunnel, as well as all parts of the cubital tunnel, are visible via ultrasound of the elbow. With this technique, Osborne's band can be appreciated covering the ulnar nerve in the cubital tunnel. The ulnar nerve is also visible if the probe moves slightly distal to the band. At this point, the ulnar nerve can be noted lying between the two bellies of the flexor carpi ulnaris muscle.[2] MRI can also be used to visualize the cubital tunnel and therefore Osborne’s band with the arm either extended and supine or extended overhead and prone.[3]

Surgical Considerations

If it is the cause of ulnar entrapment, surgeons can excise the Osborne ligament to decompress the ulnar nerve. This procedure involves exposing the nerve at the elbow and noting its area of compression. At that point, a surgeon will simply cut the ligament where it lies over the nerve.  In his discovery of the band of tissue, Osborne did this by making a small incision parallel to the ulnar nerve. He then replaced the fatty tissue over the nerve before closing.  Experience shows that patients experience relief of sensorimotor symptoms, most notably numbness, immediately following decompression of this structure, with motor functions recovering completely by one week after the operation. A case report of a woman receiving this procedure after one year of symptoms revealed substantial recovery and regeneration of the compressed ulnar nerve as shown on control electroneuromyographic studies one month after the operation.[4] 

Clinical Significance

Osborne’s band has been implicated in both tractional ulnar neuritis and ulnar entrapment leading to cubital tunnel syndrome. The band lies on the roof of the cubital tunnel, making it a prime location for compression injuries when the elbow is in flexion, as this reduces the space of the tunnel and increases the length of the band. There are four different places at which ulnar entrapment can occur. These are: the fibrous canal on the medial aspect of the arm, also known as arcade of Struthers, the fibrous canal at the wrist, also known as Guyon’s canal, the retro epicondylar groove at the elbow, and finally the aponeurosis between the muscle heads of the flexor carpi ulnaris muscles – Osborne’s band.[4] Traction against this aponeurosis can irritate the nerve, and the resulting ulnar neuritis, or ulnar nerve inflammation, presents clinically as numbness and tingling in the ulnar nerve distribution.[5]  The volume of the cubital tunnel decreases progressively with elbow flexion, which can potentially compress the nerve against Osborne's band.[6] Compression against this band results in the aforementioned cubital tunnel syndrome which presents similarly with numbness and tingling in ulnar nerve distribution that also causes nighttime awakening.

When taking a comprehensive history of someone with ulnar nerve entrapment, the historian should seek an understanding of whether or not an injury precipitated the patient's symptoms. If so, when was the onset of injury, what measures the patient has taken to alleviate their symptoms, and most importantly, in what way has functionality been reduced due to his/her symptoms?[7] At risk are patients with a history of repetitive forceful flexion & extension of fingers, wrists, and elbow without breaks in between.[8] A physical exam test helpful in identifying Osborne’s band as the cause of ulnar nerve damage is one that is meant to assess its level of tension – the ‘scratch collapse test’. It involves having the patient maintain a 90-degree elbow flexion with hand open and fingers flexed and pointed towards the person performing the exam. The assessor then rotates the forearm medially in an attempt to determine the amount of resistance produced with this movement. The suspected area of ulnar entrapment is then ‘scratched’ or ‘stroked’ and then the test is repeated. If the resistance felt after the stroking reduces considerably in comparison to the initial resistance observed, then the patient has a positive scratch collapse test, and in theory, the assessor has located the precise area of entrapment. Using this method can implicate Osborne’s band as the cause of ulnar nerve entrapment in 80% of subjects in one prospective study.[9] Although helpful, this physical exam finding is not diagnostic due to its lack of universal acceptance.[6]

Other Issues

There are several inconsistencies in the terminology used to describe this band of tissue, and the nomenclature is in question due to these inconsistencies. It has been called Osborne’s band, Osborne’s ligament, and Osborne’s fascia. Nowhere in literature has it been referred to consistently under the same terminology. This terminology is one aspect of its story yet to be decided.[10]


  • Image 7302 Not availableImage 7302 Not available
    Image Courtesy of S Bhimji MD
Attributed To: Image Courtesy of S Bhimji MD

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Anatomy, Shoulder and Upper Limb, Osborne Band - Questions

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A 35-year-old female presents to your clinic today with complaints of feeling like her left hand is "falling asleep." Her symptoms began 2 weeks ago when she woke up in the middle of the night with numbness and tingling in her left hand that went away only after she "waved her hand around" for 30 seconds. She localized the abnormal sensation to the outer side of her left ring finger and left little finger. Her symptoms are aggravated by working extra hours at her job as a cashier at the checkout line of a grocery store. Rest alleviates her symptoms. She reports that she has not tried anything else to alleviate her symptoms. On physical exam, after placing the patient's left arm in flexion at the elbow for 30 seconds, the patient reports numbness and tingling in her left ring finger and left little finger. You suspect her symptoms warrant surgical intervention, so you refer her to an orthopedic hand surgeon. What will the surgeon most likely do to manage her condition?



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A factory worker comes to the office today after noticing numbness in the fifth digit of his right hand this week. He reports that there were extra shipments placed for the holidays requiring him to move more boxes from one part of the factory floor to another all day. Compression of the ulnar nerve by what band of tissue is causing his discomfort?



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A patient is diagnosed with cubital tunnel syndrome and agrees to surgical treatment. During the procedure, the surgeon revealed the cause of her cubital tunnel syndrome to be due to compression of the ulnar nerve by Osborne band. In what way did compression of the nerve by this structure likely occur?



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Anatomy, Shoulder and Upper Limb, Osborne Band - References

References

Simsek S,Er U,Demirci A,Sorar M, Operative illustrations of the Osborne's ligament. Turkish neurosurgery. 2011     [PubMed]
Bradshaw DY,Shefner JM, Ulnar neuropathy at the elbow. Neurologic clinics. 1999 Aug     [PubMed]
Granger A,Sardi JP,Iwanaga J,Wilson TJ,Yang L,Loukas M,Oskouian RJ,Tubbs RS, Osborne's Ligament: A Review of its History, Anatomy, and Surgical Importance. Cureus. 2017 Mar 6     [PubMed]
Robertson C,Saratsiotis J, A review of compressive ulnar neuropathy at the elbow. Journal of manipulative and physiological therapeutics. 2005 Jun     [PubMed]
Jie KE,van Dam LF,Verhagen TF,Hammacher ER, Extension test and ossal point tenderness cannot accurately exclude significant injury in acute elbow trauma. Annals of emergency medicine. 2014 Jul     [PubMed]
Bonfiglioli R,Lodi V,Tabanelli S,Violante FS, [Entrapment of the ulnar nerve at the elbow caused by repetitive movements: description of a clinical case]. La Medicina del lavoro. 1996 Mar-Apr     [PubMed]
Davidge KM,Gontre G,Tang D,Boyd KU,Yee A,Damiano MS,Mackinnon SE, The     [PubMed]
De Maeseneer M,Brigido MK,Antic M,Lenchik L,Milants A,Vereecke E,Jager T,Shahabpour M, Ultrasound of the elbow with emphasis on detailed assessment of ligaments, tendons, and nerves. European journal of radiology. 2015 Apr     [PubMed]
Simonson S,Lott K,Major NM, Magnetic resonance imaging of the elbow. Seminars in roentgenology. 2010 Jul     [PubMed]
Wali AR,Gabel B,Mitwalli M,Tubbs RS,Brown JM, Clarification of Eponymous Anatomical Terminology: Structures Named After Dr Geoffrey V. Osborne That Compress the Ulnar Nerve at the Elbow. Hand (New York, N.Y.). 2017 May 1     [PubMed]

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