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The Bekhterev-Jacobsohn reflex, or Jacobsohn finger flexion sign, is a neurological sign elicited by stroking the distal radius, resulting in abduction of the hand and flexion of the fingers. First described in the early 20th century, this reflex is indicative of pyramidal tract lesions affecting the upper limb and serves as a valuable clinical tool for localizing neurological damage. Closely related to the Bekhterev-Mendel reflex in the lower limb, it also shares diagnostic significance with the Hoffmann sign and Tromner reflex, all of which point to upper motor neuron pathology. While simple to perform, the reflex offers critical insight into neurological dysfunction and is integral to comprehensive neuro-examinations. The course equips participants with a thorough understanding of the Bekhterev-Jacobsohn reflex, including its historical background, diagnostic relevance, and clinical application. Participants gain practical skills in eliciting the reflex, interpreting its findings, and integrating it with other neurological signs to enhance diagnostic accuracy. Collaborative engagement with an interprofessional healthcare team is emphasized, promoting the integration of neurologists, physical therapists, and other specialists. This teamwork fosters improved diagnostic precision and comprehensive care strategies, ultimately enhancing patient outcomes by addressing complex neurological conditions through a multifaceted approach. Objectives: Identify the clinical significance of the Bekhterev-Jacobsohn reflex in diagnosing upper motor neuron lesions. Differentiate the Bekhterev-Jacobsohn reflex from other upper limb reflexes, such as the Hoffmann and Tromner reflexes, in neurological assessments Summarize the clinical relevance of the Bekhterev-Jacobson reflex. Review the importance of improving care coordination among interprofessional team members to improve outcomes for patients with a positive Bekhterev-Jacobson reflex. Access free multiple choice questions on this topic.

The Bekhterev-Jacobsohn reflex, also known as the Jacobsohn finger flexion sign, was first described in the early 1900s by Dr Vladimir Bekhterev, a Russian neurologist, and Dr Louis Jacobsohn-Lask, a German neurologist.[1] The reflex is a simple clinical sign that can be elicited without requiring specialized equipment; it involves the abduction of the hand and flexion of the fingers when the distal radius is stroked. This reflex is particularly useful in clinical practice for determining the localization of neurological lesions, as it is indicative of a pyramidal tract lesion affecting the upper limb.[2] The Bekhterev-Jacobsohn reflex is closely related to the Bekhterev-Mendel reflex (dorsiflexion of the toes when the dorsum of the foot is tapped) in the lower limb. Additionally, it shares similarities with the Hoffmann sign (flexion of the thumb and index finger when the nail of the middle finger is flicked downwards) and the Tromner reflex (flexion of the thumb and index finger elicited by tapping the palmar surface of the distal phalanx of the middle or index finger) in the upper limb, all of which are indicative of upper motor neuron (UMN) pathology.[3]

Complications associated with the Bekhterev-Jacobsohn reflex are rare. In some cases, tapping on the distal radius may cause mild bruising, pain, or soreness, though these occurrences are uncommon and typically resolve without intervention.

Any properly trained healthcare professional can perform the Bekhterev-Jacobsohn reflex. Inexperienced clinicians should observe a skilled clinician perform the reflex or review instructional materials, such as an online tutorial, to learn the correct technique before attempting the test. Practice and experience are essential for accurately eliciting and interpreting the response. However, the validity of the Bekhterev-Jacobsohn reflex remains uncertain. The technique has not been rigorously evaluated in randomized clinical trials and should not be solely relied upon as a definitive indicator of UMN injury.