Cubital Tunnel Syndrome Info Evidence
Reviewed by Dr Kieran Hirpara, Specialist Orthopaedic Surgeon Last reviewed
Also on YouTube.
Video transcript
Cubital tunnel syndrome happens when the ulnar nerve is squeezed where it passes behind the bony bump on the inside of the elbow, the spot you know as the funny bone. It causes pins and needles, and numbness, in the little and ring fingers. Symptoms are often worse when the elbow is bent for long periods, like holding a phone, or sleeping with the arm curled up. Over time the hand can become weaker and clumsier with fine tasks, like doing up buttons or handling coins. In long-standing cases the small muscles of the hand can visibly waste. Milder cases often settle without surgery. The first step is avoiding long periods with the elbow fully bent, and adjusting how you sit, work, and sleep. A night splint that holds the elbow straighter while you sleep can make a real difference, and is usually trialled for a few months. Nerve tests help confirm the diagnosis, and show how the nerve is conducting. When the numbness becomes constant, the hand is weakening, or the nerve tests show significant slowing, surgery is usually the better path, because established muscle wasting recovers slowly, and sometimes incompletely. The operation is a cubital tunnel release, done as day surgery under a regional or general anaesthetic. Through an incision on the inside of the elbow, the tight roof of the tunnel is divided, releasing the nerve along its course. If the nerve flicks out of its groove when the elbow bends, it is moved to a new position at the front of the elbow, which is called a transposition. The operation takes around thirty to forty five minutes. The wound is closed with dissolving stitches and covered with a soft dressing. There is no period of immobilisation, and you can move the elbow freely from day one. The dressing comes off at around one week, and light desk and household tasks resume in the first week. Lifting, pushing, and gripping are built back up over four to six weeks. The pins and needles often start improving within days, while weakness and wasting recover more slowly, over months, and may not return all the way to normal in long-standing cases. Most people are back to full activity by six to eight weeks.
What you're feeling
You may notice aching pain in your elbow or the upper part of your forearm. Pain is not always the main issue. More often, you will feel worsening numbness in your hand. This numbness follows the ulnar nerve path, affecting your little finger and the ulnar side of your ring finger. You might also feel strange sensations, like tingling or burning, in these fingers.
Your symptoms often get worse when you keep your elbow bent for a long time. This includes holding a phone to your ear, reading a book, or sleeping with your arms curled up. Bending your elbow shrinks the space around the nerve and stretches it, which increases pressure. You may find that straightening your arm helps relieve the discomfort.
As the condition progresses, you might feel weak in your hand. Tasks that require grip strength become difficult. You may struggle to open jars, shake hands firmly, or type without dropping things. In later stages, you might notice your hand muscles shrinking, particularly on the palm side near your little finger. This can make your hand look different and feel less coordinated.
Men with this condition are more likely to experience muscle wasting than women. However, anyone can develop weakness in the small muscles of the hand. If you have had carpal tunnel syndrome in the past, you are at higher risk for this condition. The two conditions often appear together.
You might also feel a snapping or popping sensation in your elbow. This happens when the nerve slips out of place as you bend your arm. This movement can cause extra pain or numbness. If you press along the inside of your elbow, you may feel tenderness or a shock-like sensation down to your fingers.
These symptoms can interfere with daily life. Simple actions like turning a doorknob or holding a cup may become frustrating. If you ignore these signs, the numbness and weakness can become permanent. Early attention to these changes helps protect your hand function.
What's actually happening
The ulnar nerve runs from your neck down to your hand. It passes behind the bony bump on the inside of your elbow. This area is called the cubital tunnel. The nerve sits here in a shallow groove. It is close to the skin and has little padding. This makes it easy to irritate or compress.
Think of this nerve like an electrical cable running through a narrow, flexible duct. When you bend your elbow, the space in that duct shrinks. The cable gets stretched and squeezed. Straightening your arm opens the space and relieves the pressure. Bending it beyond 90 degrees significantly reduces the room available. This dynamic change is a key reason why symptoms often worsen with certain movements.
The nerve supplies feeling to your little finger and half of your ring finger. It also controls small muscles in your hand. When the nerve is compressed, you may feel numbness or tingling in those fingers. You might notice weakness in your grip or difficulty moving your hand muscles. Pain is not always the main issue. Some people report an ache near the elbow or forearm instead.
Sometimes the nerve slips out of its groove when you bend your arm. This is called subluxation. It can feel like a snap or pop. This movement adds extra strain to the nerve. Over time, repeated compression or stretching can damage the nerve’s protective covering. This leads to the sensory and motor symptoms you experience.
We understand that this can be confusing. Your surgeon will examine your elbow and hand to locate the exact spot of pressure. Imaging tests like ultrasound or MRI can show if the nerve is swollen or displaced. These tools help us confirm that the cubital tunnel is the source of your symptoms. Understanding this mechanism helps guide the most effective treatment plan for you.
What we can do about it
The approach Dr Kieran Hirpara, an upper-limb surgeon at Mater Private Hospital Rockhampton, takes in our clinic reflects how we manage this condition. We see cubital tunnel syndrome as the second most common nerve entrapment in the arm, affecting about 21 people per 100,000 each year. Your journey usually starts with a referral from your GP or physiotherapist. We begin with a detailed assessment to confirm the diagnosis. For long-standing or degenerative issues, we typically start with non-operative care. This includes changing your activities, physiotherapy, splinting, and sometimes injections. We consider surgery only if these steps do not provide enough improvement. For structural problems or acute injuries, we may recommend surgery right away.
Self-management focuses on protecting the nerve. You might adjust your daily habits to avoid bending your elbow for long periods or leaning on it. Physiotherapy aims to keep the nerve moving smoothly and strengthen the surrounding muscles. We often suggest splinting to keep your arm straight while you sleep, which reduces pressure on the nerve. This conservative approach gives your body time to heal. Many patients find relief through these simple changes alone. If pain persists, we discuss medical management options.
Medical management targets your symptoms directly. We may recommend anti-inflammatory medications to reduce swelling around the nerve. In some cases, we offer injections. Cortisone injections can calm inflammation and provide short-term pain relief. Hyaluronic acid or PRP (platelet-rich plasma) injections are other options we may discuss to support tissue health. These treatments aim to reduce discomfort and improve function while you continue with therapy. They do not fix the underlying compression but can make daily life more manageable.
Surgery is considered when conservative care has reached its limit. If your symptoms are worsening, or if you notice muscle weakness or numbness that affects your hand, we discuss operative options. The goal of surgery is to relieve pressure on the ulnar nerve. This allows the nerve to heal and function normally again. We review the evidence with you to ensure the decision is right for your specific situation. Outcomes vary, but many patients experience significant relief. For example, in situ decompression has a reported success rate of 65.3% to 94.1%. Transposition techniques show success rates between 77.7% and 94%. We weigh these figures against your personal goals and health status. Our aim is to help you regain comfort and use of your hand.
What to expect
Your outlook depends largely on how severe your symptoms are before treatment. Most people find that pain and function improve after surgery. This relief often extends beyond just the elbow, helping with hand symptoms too. If you have had previous surgery or persistent issues, the results can be less predictable. However, the majority of patients still experience significant symptom relief even in these complex cases.
Recovery is a process of nerve healing, which takes time. In the first few months, you may notice gradual changes in strength and sensation. For athletes who throw or play overhead sports, about 85% can return to their activity after surgery, with 72% reaching their previous performance level. For those who already compete at a high overhead level, 92% return to sport, and 62% resume their prior standard. These numbers show that while full recovery is common, it is not guaranteed for everyone.
If you have severe, long-standing compression with muscle wasting or dense numbness, surgery aims to stop further damage and improve symptoms. It will not necessarily restore normal strength or sensation completely. You should expect arrest of progression rather than a perfect return to pre-injury status. Nonsmokers tend to have better outcomes than smokers, so avoiding tobacco supports your healing.
Without treatment, symptoms often persist or worsen. The nerve remains compressed, leading to continued weakness and numbness. Early intervention generally offers a clearer path to improvement. If you undergo revision surgery for recurrent symptoms, about 77% of patients see some motor or sensory improvement, though only 23% achieve complete recovery. This highlights the importance of timely care.
Complications are generally uncommon. Short-term issues occur in roughly 3.6% to 9.6% of cases, depending on the technique used. Infection rates are low, affecting about 2.17% of cases in large studies. Secondary surgery is needed in about 5.7% of patients overall, with higher rates for those who have had prior elbow trauma or require nerve transposition. Your surgeon will discuss which approach suits your specific anatomy and severity, balancing the likelihood of relief against these small risks.
When to see someone
Ask for a specialist review if you notice worsening numbness in your ring and little fingers, or if your hand feels weak. Symptoms often worsen when your elbow is bent for long periods. See your GP if you experience aching pain in the elbow or forearm that does not improve with rest. Seek urgent care if you notice muscle wasting in your hand or sudden weakness. Early assessment helps prevent permanent nerve damage. Your surgeon can examine your sensation and strength to determine the best next steps for your care.
Evidence & references
Overview
- Cubital tunnel syndrome involves related anatomy, clinical presentation, and current management options [1].
- A subset of patients with cubital tunnel syndrome may benefit from earlier referral for hand surgery evaluation and earlier surgery [2].
- Patient-reported outcomes of surgical treatment for cubital tunnel syndrome are good but are affected by preoperative symptom severity [4].
- Surgery is effective in treating cubital tunnel syndrome, with more than 90% of patients cured or showing improvement [5].
- More rigorous scientific studies are needed to determine the most effective surgical approaches for cubital tunnel syndrome [6].
- A treatment algorithm has been proposed to provide clarity about the challenges of treating the complex patient population with cubital tunnel syndrome [7].
- There is currently no consensus on the best surgical treatment of cubital tunnel syndrome [8].
- Carpal tunnel and cubital tunnel syndrome requiring surgery is more common in deprived patients and occurs at an earlier age [12].
- Endoscopic cubital tunnel decompression has gained popularity, with early short-term results showing satisfactory outcomes and minimal complications [14].
- The selection of operative procedures for cubital tunnel syndrome is influenced by patient factors and surgeon preference, with most surgeons using more than one operative procedure [29].
Anatomy & Pathophysiology
- Definitions for the degree of ulnar nerve instability at the elbow are not uniformly agreed upon [28].
- With elbow flexion, the ulnar nerve did not move appreciably in the distal–proximal direction directly at the cubital tunnel [49].
- Maximal ulnar nerve excursion during elbow flexion occurs in the fatty region proximal to the elbow [49].
- The humeral trochlea protrudes into the cubital tunnel during elbow flexion, causing dynamic morphologic changes in the ulnar nerve [50].
- Tearing of the ulnar collateral ligament significantly increases elbow valgus laxity, which elongates the ulnar nerve during simulated throwing motion [51].
- Increased elbow flexion influences the intraneural blood flow of the ulnar nerve in patients with cubital tunnel syndrome [57].
- Exposure to lesser extraneural pressure by repetitive non-maximum elbow flexion might be more deleterious than maximum flexion pressure in cubital tunnel syndrome [55].
- Shoulder position changes the ulnar nerve strain around the elbow in living patients with cubital tunnel syndrome [56].
- The mechanism of symptom provocation by the elbow flexion test cannot be explained simply by dynamic pressure in the cubital tunnel, suggesting other pathophysiological factors contribute [58].
- Ulnar nerve gliding is most severe during passive wrist movement in elbow flexion and forearm supination [59].
- The study could not detect a definitive effect of elbow deformity (cubitus valgus/varus) on ulnar nerve strain or demonstrate the extent of acceptable clinical elbow deformity [61].
- The throwing elbow is a common source of nerve injuries due to the unique combination of anatomy, high forces, and sheer repetition associated with throwing sports [62].
- Dynamic ulnar nerve compression at the elbow due to the anconeus epitrochlearis muscle is an uncommon disorder with much remaining to be elucidated about its incidence and pathophysiologic mechanisms [64].
Classification
- Cubital tunnel syndrome is the most common form of entrapment of the ulnar nerve [18].
- Cubital tunnel syndrome is the second most common nerve compression syndrome of the upper extremity [18].
- Definitions for the degree of ulnar nerve instability at the elbow are not uniformly agreed upon [28].
- Further development of a classification system for ulnar nerve instability may be warranted to standardize treatment [28].
- High-resolution ultrasound (HRU) shows good correspondence to clinical and ENMG classifications in cubital tunnel syndrome [35].
- An intraoperative ulnar nerve subluxation classification system has promise in preventing adverse complications of ulnar nerve hypermobility after endoscopic cubital tunnel release [43].
Clinical Presentation
- Cubital tunnel syndrome is the most common form of entrapment of the ulnar nerve [18].
- Cubital tunnel syndrome is the second most common nerve compression syndrome of the upper extremity [18].
- Patients with cubital tunnel syndrome present earlier in the course of their disease than patients with carpal tunnel syndrome [3].
- Men with cubital tunnel syndrome are more likely to present with muscle atrophy than women [10].
- Carpal tunnel and cubital tunnel syndrome requiring surgery is more common in deprived patients and occurs at an earlier age [12].
- The majority of patients suffering from cubital tunnel syndrome with mild or moderate symptoms benefit from conservative treatment [20].
- Cubital tunnel syndrome in pediatric or adolescent patients is rare [19].
- Non-operative treatment of cubital tunnel syndrome in pediatric and adolescent patients is unlikely to resolve symptoms [22].
- There is no consensus reference standard for the diagnosis of Cubital Tunnel Syndrome [11].
- Provocative tests for Cubital Tunnel Syndrome have inadequate or inconsistent sensitivity and specificity [11].
- Diagnosis of Cubital Tunnel Syndrome should be discussed in terms of probabilities rather than certainties [11].
- Clinical evaluation is paramount in the diagnosis of cubital tunnel syndrome because electrodiagnostic testing often is not sufficiently sensitive to detect changes associated with the syndrome [17].
- Nearly forty percent of patients with a provisional diagnosis of Cubital Tunnel Syndrome had either another nerve pathology or a normal nerve conduction study [21].
Investigations
- Provocative tests for cubital tunnel syndrome have inadequate or inconsistent sensitivity and specificity [11].
- There is no consensus reference standard for the diagnosis of cubital tunnel syndrome [11].
- Diagnosis of cubital tunnel syndrome should be discussed in terms of probabilities rather than certainties [11].
- Electrodiagnostic testing is often not sufficiently sensitive to detect changes associated with cubital tunnel syndrome [17].
- Clinical evaluation is paramount in the diagnosis of cubital tunnel syndrome [17].
- Nearly forty percent of patients with a provisional diagnosis of cubital tunnel syndrome had either another nerve pathology or a normal nerve conduction study [21].
- Ulnar nerve cross-sectional area (CSA) measured by ultrasound is useful for the diagnosis of cubital tunnel syndrome [47].
- Ulnar nerve CSA measured by ultrasound is most significantly different between patients and controls at the medial epicondyle [47].
- Power Doppler ultrasound has high predictive value for severe cubital tunnel syndrome defined by axonal loss [54].
- MRI is an effective diagnostic modality for identifying primary synovial chondromatosis as a causative factor of cubital tunnel syndrome [38].
- Only a small number of individuals with MRI evidence of an anconeus epitrochlearis muscle (AEM) had clinical evidence of ulnar neuropathy [48].
- Cubital tunnel decompression is associated with prior trauma to the anatomic site [53].
Treatment
Non-Operative Management
- The majority of patients with mild or moderate cubital tunnel syndrome symptoms benefit from conservative treatment [20].
- Non-operative treatment is unlikely to resolve symptoms in pediatric and adolescent patients [22].
Operative Management: General Principles and Selection
- There is currently no consensus on the best surgical treatment for cubital tunnel syndrome [8].
- Most surgeons use more than one operative procedure for cubital tunnel syndrome, with selection influenced by patient factors and surgeon preference [29].
- Surgery is effective in treating cubital tunnel syndrome, with more than 90% of patients cured or showing improvement [5].
- None of the surgical techniques has demonstrated universal superiority above all others, but all appear to be effective [41].
- A subset of patients may benefit from earlier referral for hand surgery evaluation and earlier surgery [2].
- Reoperation after primary surgery provides satisfactory results for patients who fail conservative treatment [15].
- In situ decompression of the ulnar nerve is a reliable treatment with a low failure rate [40].
Operative Techniques: Decompression
- Simple decompression with a small skin incision yielded satisfactory results in 14 of 18 elbows with no postoperative dislocation of the ulnar nerve [32].
- Endoscopic and open in situ decompression techniques demonstrate similar effectiveness, outcomes, complication profiles, and reoperation rates for idiopathic cubital tunnel syndrome [39].
- The patient-reported outcome of surgical treatment is good but is affected by preoperative symptom severity [4].
Operative Techniques: Transposition and Other Procedures
- Both minimal medial epicondylectomy and anterior subcutaneous transposition can be used for cubital tunnel syndrome with a high rate of satisfaction [37].
- Medial epicondylectomy is recommended for patients with cubital tunnel syndrome associated with abnormal nerve-conduction velocity [33].
- The procedure offers complete release of constricting structures while preserving blood supply to the nerve and allowing early postoperative elbow mobilization [25].
Operative Techniques: Specialized and Combined Procedures
- Bony encasement of the ulnar nerve secondary to heterotopic ossification of the elbow is treated with an approach that leads to superior range of motion, improved or resolved ulnar neuropathy, and good to excellent long-term functional outcomes [26].
- Dual endoscopic carpal and cubital tunnel release is a safe and effective treatment option for patients with concurrent syndromes recalcitrant to nonsurgical management [36].
Complications
- Surgery was effective in treating cubital tunnel syndrome with more than 90% of patients cured or showing improvement [5].
- The short-term complication rates of cubital tunnel surgery are low (3.2%) [24].
- Short-term complication rates for cubital tunnel surgery are higher for patients with chronic kidney disease [24].
- Endoscopic cubital tunnel decompression shows satisfactory outcomes and minimal complications [14].
- Reoperation after primary surgery of cubital tunnel syndrome gave satisfactory results for patients who fail conservative treatment [15].
- Results of revision surgery for recurrent or persistent cubital tunnel syndrome are less predictable and satisfying than primary surgery [31].
- Poor outcomes and unnecessary revision surgeries for cubital tunnel syndrome can be avoided with intraoperative attention to 7 structures distal to the medial epicondyle [44].
Recovery
- Patients with carpal tunnel syndrome present earlier in the course of their disease than patients with cubital tunnel syndrome [3].
- A subset of patients with cubital tunnel syndrome may benefit from earlier referral for hand surgery evaluation and earlier surgery [2].
- The patient-reported outcome of surgical treatment of cubital tunnel syndrome is good but is affected by preoperative symptom severity [4].
- Surgery was effective in treating cubital tunnel syndrome with more than 90% of patients cured or showing improvement [5].
- Symptoms in an extra-ulnar distribution can resolve following cubital tunnel release [9].
- Reliable, reproducible, and valid outcomes measures are lacking from the surgical literature for cubital tunnel syndrome [13].
- Endoscopic cubital tunnel decompression shows satisfactory outcomes and minimal complications in early short-term results [14].
- Reoperation after primary surgery of cubital tunnel syndrome gave satisfactory results for patients who fail conservative treatment [15].
- The short-term complication rates of cubital tunnel surgery are low (3.2%), but higher for patients with chronic kidney disease [24].
- Treatment of bony encasement of the ulnar nerve secondary to heterotopic ossification leads to superior range of motion, improved or resolved ulnar neuropathy, and good to excellent long-term functional outcomes [26].
- There are no significant differences in long-term outcomes after open and retractor-endoscopic in situ decompression of the ulnar nerve in cubital tunnel syndrome [30].
- Results of revision surgery for recurrent or persistent cubital tunnel syndrome are less predictable and satisfying than primary surgery [31].
- Patients with an anomalous muscle (AE) experience quicker symptom improvement after cubital tunnel release than those without the anomalous muscle [34].
Key Evidence
- [L5] This article reviews related anatomy, clinical presentation, and current management options for cubital tunnel syndrome with an emphasis on contemporary outcomes research. [1] (10.1016/j.jhsa.2015.03.011)
- [L3] A subset of patients with cubital tunnel syndrome may benefit from earlier referral for hand surgery evaluation and earlier surgery. [2] (10.1177/15589447211058821)
- [L4] Patients with carpal tunnel syndrome present earlier in the course of their disease than patients with cubital tunnel syndrome. [3] (10.1016/j.jhsa.2007.03.009)
- [L3] The patient-reported outcome of surgical treatment of cubital tunnel syndrome is good but is affected by preoperative symptom severity. [4] (10.1016/j.jhsa.2009.05.014)
- [L4] Surgery was effective in treating cubital tunnel syndrome with more than 90% of patients cured or showing improvement. [5] (10.1016/j.otsr.2014.03.009)
- [L4] More rigorous scientific studies are needed to determine the most effective surgical approaches for cubital tunnel syndrome. [6] (10.1007/s12178-020-09650-y)
- [L4] The purpose of this review is to summarize the most up-to-date literature regarding cubital tunnel syndrome and propose a treatment algorithm to provide clarity about the challenges of treating this complex patient population. [7] (10.1016/j.jhsg.2022.07.008)
- [L5] There is currently no consensus on the best surgical treatment of cubital tunnel syndrome. [8] (10.1016/j.ocl.2012.07.017)
- [L3] This study documents resolution of symptoms in an extra-ulnar distribution after cubital tunnel release. [9] (10.1007/s11552-014-9688-9)
- [L4] Men with cubital tunnel syndrome are more likely to present with muscle atrophy than women. [10] (10.1177/1558944716643096)
- [L4] There is no consensus reference standard for the diagnosis of Cubital Tunnel Syndrome, and provocative tests have inadequate or inconsistent sensitivity and specificity; diagnosis should be discussed in terms of probabilities rather than certainties. [11] (10.1016/j.jhsa.2011.03.021)
- [L4] Carpal tunnel and cubital tunnel syndrome requiring surgery is more common in deprived patients and occurs at an earlier age. [12] (10.1177/1753193420939384)
- [L3] Reliable, reproducible, and valid outcomes measures are lacking from the surgical literature for cubital tunnel syndrome. [13] (10.1016/j.jhsa.2009.05.010)
- [L5] Endoscopic cubital tunnel decompression has gained popularity with early short-term results being encouraging, showing satisfactory outcomes and minimal complications. [14] (10.1136/jisakos-2020-000506)
- [L4] Clinical evaluation is paramount in the diagnosis of cubital tunnel syndrome because electrodiagnostic testing often is not sufficiently sensitive to detect changes associated with the syndrome. [17] (10.1016/j.hcl.2013.08.019)
- [L5] Cubital tunnel syndrome is the most common form of entrapment of the ulnar nerve and the second most common nerve compression syndrome of the upper extremity. [18] (10.1016/s0749-0712(21)00356-5)
- [L3] Cubital tunnel syndrome in pediatric or adolescent patients is rare and can be treated successfully with surgical intervention. [19] (10.1016/j.jhsa.2012.01.016)
- [L2] The majority of patients suffering from cubital tunnel syndrome with mild or moderate symptoms benefit from conservative treatment. [20] (10.1177/1753193408098480)
- [L4] Nearly forty percent of patients with a provisional diagnosis of CubTS had either another nerve pathology or a normal test. [21] (10.1016/j.jse.2020.01.064)
- [L4] Non-operative treatment of cubital tunnel syndrome in pediatric and adolescent patients is unlikely to resolve symptoms. [22] (10.1016/s0363-5023(11)60063-4)
- [L4] The short-term complication rates of cubital tunnel surgery are low (3.2%), but higher for patients with chronic kidney disease. [24] (10.1016/j.jhsa.2017.01.020)
- [L5] The procedure offers complete release of constricting structures while preserving blood supply to the nerve and allowing early postoperative elbow mobilization. [25] (10.1016/s0749-0712(21)00325-5)
- [L4] This treatment approach leads to superior range of motion, improved or resolved ulnar neuropathy, and good to excellent long-term functional outcomes. [26] (10.1016/j.jse.2023.12.003)
- [L4] Most surgeons use more than one operative procedure in their treatment of patients with cubital tunnel syndrome and the selection of the operative procedure is influenced by patient factors and surgeon preference. [29] (10.1007/s11552-008-9133-z)
- [L3] There are no significant differences in long-term outcomes after open and retractor-endoscopic in situ decompression of the ulnar nerve in cubital tunnel syndrome. [30] (10.1227/neu.0b013e3182846dbd)
- [L4] Results of revision surgery for recurrent or persistent cubital tunnel syndrome are less predictable and satisfying than primary surgery. [31] (10.1016/j.jhsa.2011.11.024)
- [L4] The technique yielded satisfactory results in 14 of 18 elbows with no postoperative dislocation of the ulnar nerve. [32] (10.1054/jhsb.2002.0821)
- [L4] The procedure is recommended for patients with cubital tunnel syndrome associated with abnormal nerve-conduction velocity. [33] (10.2106/00004623-198062060-00016)
- [L3] Patients with an AE experience quicker symptom improvement after cubital tunnel release than those without the anomalous muscle. [34] (10.1016/j.jhsa.2017.06.033)
- [L4] HRU proved to be an effective diagnostic tool for cubital tunnel syndrome and its etiologies, showing good correspondence to clinical and ENMG classifications. [35] (10.1016/j.otsr.2014.03.008)
- [L4] Preliminary data demonstrate that dual endoscopic carpal and cubital tunnel release is a safe and effective treatment option for patients who present with concurrent cubital and carpal tunnel syndromes recalcitrant to nonsurgical management. [36] (10.1007/s11552-013-9552-3)
- [L3] Both methods can be used for the treatment of cubital tunnel syndrome with a high rate of satisfaction. [37] (10.1016/j.jse.2005.10.007)
- [Case_report] MRI is an effective diagnostic modality, and clinicians should be aware of primary synovial chondromatosis as a causative factor of cubital tunnel syndrome. [38] (10.1177/1758573216683396)
- [L1] The current study demonstrates similar effectiveness between the endoscopic (ECTuR) and open (OCTuR) techniques for treatment of idiopathic cubital tunnel syndrome with similar outcomes, complication profiles, and reoperation rates. [39] (10.1177/1558944715616097)
- [L4] In situ decompression of the ulnar nerve is a reliable treatment for cubital tunnel syndrome with a low failure rate. [40] (10.1177/1753193408101467)
- [L4] None of the techniques in this review has demonstrated universal superiority above all others, but all appear to be effective in the treatment of cubital tunnel syndrome. [41] (10.3389/fsurg.2018.00048)
- [L4] Our preliminary report of patients shows satisfactory outcomes, which suggests that our intraoperative ulnar nerve subluxation classification system has promise in preventing adverse complications of ulnar nerve hypermobility after endoscopic cubital tunnel release. [43] (10.1016/j.jhsg.2020.05.001)
- [L5] Poor outcomes and unnecessary revision surgeries for cubital tunnel syndrome can be avoided with intraoperative attention to 7 structures distal to the medial epicondyle. [44] (10.1177/1558944718771390)
- [L1] The ulnar nerve CSA measured by US imaging is useful for the diagnosis of cubital tunnel syndrome (CuTS), and is most significantly different between patients and controls at the medial epicondyle. [47] (10.1016/j.apmr.2017.08.467)
- [L4] Only a small number of individuals with MRI evidence of an AEM had clinical evidence of ulnar neuropathy. [48] (10.1016/j.jse.2018.03.021)
- [L5] With elbow flexion, the ulnar nerve did not move appreciably in the distal–proximal direction directly at the cubital tunnel, but maximal excursion was in the fatty region proximal to the elbow. [49] (10.1016/j.jhsa.2012.03.016)
- [L5] The humeral trochlea protrudes into the cubital tunnel during elbow flexion, causing dynamic morphologic changes in the ulnar nerve. [50] (10.1016/j.jse.2022.05.026)
- [L5] Tearing of the UCL significantly increased elbow valgus laxity, which in turn elongated the ulnar nerve during simulated throwing motion. [51] (10.1016/j.jse.2019.02.009)
- [L4] Cubital tunnel decompression is associated with prior trauma to the anatomic site. [53] (10.1016/j.jhsa.2017.07.009)
- [L3] Power Doppler ultrasound demonstrated high predictive value for severe cubital tunnel syndrome defined by axonal loss. [54] (10.1177/15589447221127334)
- [L4] The increased pressure in the cubital tunnel could still be important, as exposure to a lesser extraneural pressure by repetitive non-maximum elbow flexion might be more deleterious. [55] (10.3109/2000656x.2012.747962)
- [L4] To the best of our knowledge, this is the first study showing that shoulder position changes the ulnar nerve strain around the elbow in living patients with CubTS. [56] (10.1016/j.jse.2015.01.014)
- [L3] Increased elbow flexion in patients with CuTS influences the intraneural blood flow of the ulnar nerve. [57] (10.1016/j.jhsa.2021.06.024)
- [L3] The mechanism of provocation of symptoms of cubital tunnel syndrome by the elbow flexion test could not be explained simply by dynamic pressure in the cubital tunnel, and other pathophysiological factors could also be contributing. [58] (10.1016/j.jhsa.2010.11.013)
- [L4] Ulnar nerve gliding was most severe during passive wrist movement in elbow flexion and forearm supination. [59] (10.5397/cise.2024.00934)
- [L5] The study could not detect a definitive effect of elbow deformity on ulnar nerve strain or demonstrate the extent of acceptable clinical elbow deformity. [61] (10.1186/s12891-022-05786-9)
- [L5] The throwing elbow is a common source of nerve injuries due to the unique combination of anatomy, high forces, and sheer repetition associated with throwing sports. [62] (10.1016/j.csm.2004.04.012)
- [L4] Dynamic ulnar nerve compression at the elbow due to the anconeus epitrochlearis muscle is an uncommon, little-known disorder with much remaining to be elucidated about its incidence and pathophysiologic mechanisms. [64] (10.1016/j.jhsg.2022.11.002)
References
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