Pain on wrist extension near FCU tendon due to?
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FCU flexor carpi ulnaris tendon pain wrist extension causes
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ulnar wrist pain tendinopathy differential diagnosis
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Based on retrieved sources and anatomical knowledge, here is a comprehensive answer:
Pain on Wrist Extension Near the FCU Tendon
Anatomy Context
The flexor carpi ulnaris (FCU) is a wrist flexor that inserts into the pisiform, hook of hamate, and 5th metacarpal base. It lies on the ulnar/volar aspect of the wrist. Pain in this region provoked by wrist extension (which stretches the FCU and stresses adjacent structures) has several causes:
Common Causes
1. FCU Tendinopathy / Tendinitis
- Most common cause of pain directly over the FCU tendon
- Wrist extension stretches the FCU tendon, reproducing pain
- Often due to overuse (racquet sports, golf, manual labor)
- Tenderness over the pisiform and ulnar volar wrist
2. Triangular Fibrocartilage Complex (TFCC) Injury
- The TFCC stabilizes the distal radioulnar joint (DRUJ) and sits on the ulnar side of the wrist
- Traumatic or degenerative tears present with ulnar-sided wrist pain, which can be exacerbated by wrist loading and rotation in extension
- Diagnosed with MRI arthrogram or wrist arthroscopy (Bailey & Love's, p. 563)
3. Pisotriquetral Arthritis / Pisiform Pathology
- The FCU inserts onto the pisiform; arthritic or instability changes in the pisotriquetral joint can mimic FCU tendinopathy
- Pain on gripping and wrist extension; tenderness directly over the pisiform
4. ECU (Extensor Carpi Ulnaris) Tendon Pathology
- The ECU runs dorso-ulnar, but can cause pain that is confused with the volar FCU region
- ECU subluxation or tendinitis is provoked during forearm supination + wrist extension
5. Ulnar Tunnel Syndrome (Guyon's Canal Compression)
- Compression of the ulnar nerve in Guyon's canal (just adjacent to the FCU/pisiform)
- Pain, numbness, and weakness on the ulnar side; may worsen with wrist positions that tension the nerve
6. Distal Radioulnar Joint (DRUJ) Instability
- Instability or arthritis at the DRUJ produces ulnar-sided wrist pain reproduced by extension and forearm rotation
7. Hook of Hamate Fracture
- The FCU indirectly transmits force to the hamate; a hook fracture causes pain at the hypothenar/ulnar base reproduced by gripping and wrist movements
- Common in golfers and racquet sport athletes
Distinguishing Features
| Condition | Key Finding |
|---|---|
| FCU Tendinopathy | Tenderness directly over FCU, pain with resisted wrist flexion + ulnar deviation |
| TFCC Tear | Press test, ulnar fovea sign, DRUJ instability |
| Pisotriquetral Arthritis | Pisiform grind test positive |
| ECU Pathology | Dorso-ulnar tenderness, provoked by supination |
| Ulnar Tunnel Syndrome | Sensory/motor deficits in ulnar distribution |
| Hook of Hamate Fracture | Hypothenar tenderness, carpal tunnel view X-ray/CT |
Key Clinical Pearl
Pain on wrist extension near the FCU specifically suggests the tendon is being stretched under load — this is most consistent with FCU tendinopathy or pisotriquetral joint pathology, but TFCC injury must always be excluded in ulnar-sided wrist pain, especially with a history of trauma (Bailey & Love's, p. 563).
Treatment of Schwanoma near elbow , cubital region
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schwannoma treatment surgical excision peripheral nerve sheath tumor
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cubital tunnel ulnar nerve schwannoma elbow treatment
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Based on retrieved sources and established surgical knowledge:
Treatment of Schwannoma in the Cubital/Elbow Region
Background
A schwannoma (neurilemmoma) near the elbow most commonly arises from the ulnar nerve in the cubital tunnel, though it can arise from any peripheral nerve in the region (median, radial, medial cutaneous nerve of forearm). It is a benign, encapsulated tumor arising from Schwann cells of the nerve sheath — crucially, it is eccentric to the nerve fascicles, which is the key surgical advantage.
Preoperative Workup
| Investigation | Purpose |
|---|---|
| MRI with contrast | Characterize lesion, assess nerve involvement, rule out malignancy |
| Ultrasound | Can show nerve swelling/fusiform mass at elbow (Harrison's, p. 12707); guides needle biopsy if needed |
| Electrodiagnostics (NCV/EMG) | Baseline ulnar nerve function; slowing across elbow suggests nerve involvement |
| CT (if bony involvement suspected) | Rule out osseous erosion |
Definitive Treatment: Surgical Excision (Enucleation)
Schwannomas are treated by intracapsular enucleation (shell-out technique), which is the gold standard:
Key Principles
- Nerve-sparing dissection — since schwannomas are eccentric to nerve fascicles, they can be shelled out from the nerve without sacrificing it
- Fascicular preservation — the tumor is peeled away from the native fascicles under loupe magnification or microsurgical technique
- Intraoperative nerve monitoring — used in many centers to reduce risk of post-excision neurological deficit
- Do NOT perform en bloc resection — unlike neurofibromas (which are intrafascicular), schwannomas do not require nerve sacrifice; en bloc would cause unnecessary denervation
Surgical Approach for Cubital Region
- Medial approach to the elbow along the ulnar nerve course
- Identify the cubital tunnel; release the Osborne ligament if concurrent cubital tunnel syndrome is present
- Careful dissection under magnification to identify the tumor capsule
- Longitudinal incision through the epineurium; blunt dissection to enucleate the tumor
- If nerve compression coexists: ulnar nerve decompression or anterior transposition at the same sitting
When Malignancy is Suspected (Malignant Peripheral Nerve Sheath Tumor — MPNST)
- MPNSTs can arise from schwannomas, especially in neurofibromatosis type 1 (NF1) (Harrison's, p. 2745)
- Red flags: rapid growth, pain, firmness, size >5 cm, invasion on MRI
- Treatment shifts to wide local excision with clear margins ± adjuvant radiotherapy
- Chemotherapy (ifosfamide-based) for metastatic disease
Outcomes
| Factor | Prognosis |
|---|---|
| Benign schwannoma | Excellent; recurrence rare after complete enucleation |
| Post-op neurological deficit | Low (~5%) with microsurgical technique |
| Malignant transformation | Extremely rare for isolated schwannoma (more common in NF1) |
| Recurrence | <5% for benign; higher for MPNST |
Summary
Intracapsular microsurgical enucleation is the treatment of choice for a cubital region schwannoma. The eccentric nature of the tumor relative to nerve fascicles allows complete removal while preserving ulnar nerve function. Concurrent cubital tunnel decompression should be performed if ulnar neuropathy is present. Malignant transformation must always be excluded, particularly in NF1 patients.
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