Guyon-Logen syndrome (ulnar tunnel on the wrist)

Anatomy: What is Guyon Lodge?

Guyon's tunnel (ulnar tunnel) is a canal on the flexor side of the wrist, formed, among other things, by the pisiform bone and the hook of the hook bone (hamulus ossis hamati). The ulnar artery and the ulnar nerve run in this canal.

The nerve divides into a superficial sensory branch (feeling in the little finger and ulnar half of the ring finger) and a deep motor branch (control of the interosseous, adductor pollicis and hypothenar muscles).

• Zone 1: before division – sensitivity and strength disorders possible
• Zone 2: deep, motor branch – v. a. Loss of strength without sensory disturbance
• Zone 3: superficial, sensitive branch – v. a. Numbness/tingling without loss of strength

Definition and classification

In Guyon-Logen syndrome, the ulnar nerve is compressed at the level of the wrist. It is therefore a peripheral nerve entrapment syndrome disease - comparable to carpal tunnel syndrome (median nerve), but with a different nerve distribution and other typical symptoms.

It is important to differentiate from cubital tunnel syndrome (ulnar narrowing at the elbow): both affect the same nerve, but in different places with different symptoms and procedures.

Symptoms: How do you recognize Guyon-Logen syndrome?

• Tingling, pins and needles or numbness in the little finger and the ulnar half of the ring finger
• Weakness in hand: spreading/closing fingers, weak forceps grip
• Fine motor problems: e.g. B. Buttons, typing, instrument guidance
• Pain/tenderness on the flexor side of the wrist next to the pea bone
• Nocturnal discomfort or under strain with pressure on the ball of the hand (handlebars, crutches, tools)
• Signs in status: positive Tinel sign above Guyon's box, Froment sign (flexion of the thumb when holding a paper), Wartenberg sign (abduction position of the little finger)

Motor symptoms without sensory impairment indicate compression of the deep branch (zone 2). Pure sensory disturbances indicate superficial zone 3. Combinations suggest a higher, still undivided compression (zone 1).

Causes and risk factors

• Repeated pressure on the heels of the hands: cycling (handlebar), wheelchair use, support exercises
• Spaces: ganglion cyst, lipoma, scar tissue
• Bone changes/injuries: Fractures or osteoarthritis of the hookbone/peabone
• Vascular causes: Thickening/thrombosis/aneurysm of the ulnar artery (hypothenar hammer syndrome)
• Occupational stress: vibrating tools, hard surfaces, monotonous pressure loads
• Rare: anatomical variants, tendon sheath thickening

General factors such as diabetes, smoking or systemic neuropathies can also make nerves more sensitive. They do not necessarily cause the syndrome, but can influence its course and regeneration.

Diagnostics: This is how we proceed

The combination of targeted examination and additional diagnostics enables a reliable differentiation from other causes such as cubital tunnel syndrome or carpal tunnel syndrome.

Conservative therapy: treat gently at first

In many cases, symptoms can be significantly improved through consistent pressure relief and targeted training. The time until noticeable improvement varies; The first effects often become apparent after 2-6 weeks.

• Load adjustment: taking breaks, changing hand position, avoiding constant pressure on the ball of the hand.
• Ergonomics: padded cycling gloves/handlebar grips, soft workplace supports, adapted tool handles.
• Splint treatment: at night or temporarily a neutral wrist position to relieve pressure.
• Physiotherapy/hand therapy: nerve mobilization (neurodynamics), coordination/fine motor skills, gentle stretching and strengthening programs.
• Medical support: short-term anti-inflammatory painkillers (e.g. NSAIDs) if necessary; topical options to protect the stomach.
• Treatment of causes: e.g. B. Puncture/observation of small ganglia; Interdisciplinary clarification of vascular findings.
• Lifestyle: good blood sugar control, quitting smoking and adequate sleep promote nerve regeneration.

Injections directly into Guyon's box are cautious because of their proximity to the ulnar artery and are only considered under imaging in selected situations. An individual benefit-risk assessment is essential.

Surgical therapy: when and how?

Surgery is considered if, despite conservative measures, there are persistent or progressive motor deficits, there is a clear mass or measurements confirm a relevant narrowing. The aim is to specifically decompress the nerve and eliminate the cause.

• Open decompression of Guyon's lodge with cleavage of constricting structures.
• Targeted release of the deep motor branch in isolated motor weakness.
• removal of ganglia or scar tissue; Treatment of bony causes (e.g. hook bone fracture).
• Vascular surgical measures for hypothenar hammer syndrome in collaboration with vascular specialists.

Follow-up treatment: short immobilization, early functional mobilization and hand therapeutic exercise programs. The recovery of sensitive functions can take weeks, and the development of strength often takes several months. The extent of recovery depends on the degree of previous damage to the nerve.

As with any operation, there are risks, including: Wound healing disorders, bruises, temporary sensory disorders or - rarely - injuries to nerve or vascular branches. These aspects are carefully discussed in advance.

Course and prognosis

If the load is relieved early, there is a good chance that sensory disturbances will subside and hand function will stabilize. Long-standing or severe compressions require more time; Motor deficits regenerate more slowly than sensory disorders.

• First improvement with conservative therapy: often after 2-6 weeks
• Complete nerve regeneration: depending on the severity, several months
• After surgery: everyday activities often after 1-2 weeks, vigorous exertion after individual consultation

Consistent pressure relief, ergonomic adjustments and hand therapy support are crucial.

Prevention and everyday tips

• Avoid pressure: soft pads, gel gloves, correct handlebar posture when cycling.
• Posture/technique: Do not support hands permanently, optimize grip width and shape.
• Workplace ergonomics: mouse/keyboard position, forearm rests, breaks every 45-60 minutes.
• Training: Strengthen hand and forearm muscles in a balanced manner, train coordination.
• Regeneration: micro-breaks, sleep, adequate hydration.
• Take warning signals seriously: clarify persistent tingling/weakness promptly.

Differential diagnoses: What do you have to differentiate between?

• Cubital tunnel syndrome (ulnar nerve compression at the elbow)
• Carpal tunnel syndrome (median nerve, thumb–middle finger affected)
• Radial tunnel syndrome (extensor side forearm/hand problems)
• Polyneuropathies (e.g. diabetic) – usually bilateral, stocking/glove-shaped
• Cervical spine root stimulus (C8/T1) – neck or arm pulling pain, dermatome distribution
• Complex regional pain syndrome (CRPS) after injuries/surgery
• Vascular diseases of the hand (hypothenar hammer) – cold/color changes

Occupational medicine and sports

Employees with repetitive wrist strain (assembly, construction, care, logistics) benefit from ergonomic advice, alternating work plans and aids. Incorporating hand therapy at an early stage makes it easier to return to work.

In sports, care should be taken to avoid long-term support positions, especially when cycling, gymnastics, calisthenics or strength training. Technical training and equipment adjustment are often more important than training breaks alone.

When should you seek medical advice?

• Numbness or tingling of the little finger/ring finger for more than a few days
• New weakness when spreading/closing fingers or using forceps grip
• Visible muscle loss in the hand (Interossei/Hypothenar)
• Pain or palpable lump on the wrist flexor side
• Sensitivity to cold, color change of the fingers or whitening depending on stress

Emergency signs: sudden severe circulatory problems in the hand, rapidly increasing paralysis or severe pain after an injury - please see an emergency immediately.

Your treatment in Hamburg

In our orthopedic practice at Dorotheenstrasse 48, 22301 Hamburg, we value structured diagnostics and gradual, conservative therapy. Surgical options are only recommended if there is a clear indication and after careful information.

If necessary, we coordinate on an interdisciplinary basis (hand therapy, radiology, vascular medicine) and accompany you from the root cause analysis to the return to everyday life, work and sport.

Common misunderstandings

• “Pingling in the little finger is always carpal tunnel.” – No, that speaks more for the ulnar nerve (Guyon's nerve or elbow).
• “Without pain, nothing is serious.” – Pure emotional or strength disorders are typical warning signs.
• “Only surgery will help.” – Many cases improve with targeted relief and therapy.
• “Gentleness alone is enough.” – Without ergonomic and technical adjustments, complaints often return.