Volar-Radial Wrist Tendinopathy
- Flexor carpi radialis (FCR) tendinopathy is a cause of VOLAR-RADIAL wrist pain arising where the FCR tendon runs through a tight FIBRO-OSSEOUS TUNNEL against the TRAPEZIAL RIDGE and the SCAPHOID tuberosity before inserting onto the bases of the second (and third) metacarpals; the confined course makes it prone to friction/tendinopathy.
- It presents with pain and tenderness over the FCR tendon at and just proximal to the volar-radial wrist crease, worse on RESISTED wrist FLEXION and RADIAL DEVIATION and on direct palpation; it is usually an overuse/degenerative tendinopathy rather than a true acute inflammation.
- There are important ASSOCIATIONS: the FCR runs immediately adjacent to the TRAPEZIOMETACARPAL (basal-thumb) and SCAPHOTRAPEZIOTRAPEZOID (STT) joints, so FCR symptoms frequently accompany basal-thumb/STT OSTEOARTHRITIS, and FCR tendinopathy (and even rupture) is a recognised COMPLICATION of TRAPEZIOMETACARPAL SUSPENSION ARTHROPLASTY, where tissue is wrapped around the FCR for suspension.
- The DIFFERENTIAL of volar-radial wrist pain must be worked through: DE QUERVAIN'S tenosynovitis (first dorsal compartment, more dorso-radial, positive Finkelstein test), STT and trapeziometacarpal OSTEOARTHRITIS, scaphoid pathology, and radial-sided wrist ganglia - examine and image (radiographs for the basal-thumb/STT joints; ultrasound/MRI for the tendon) to localise the source.
- MANAGEMENT is NON-OPERATIVE first: activity modification/rest, a wrist (and sometimes thumb) SPLINT, non-steroidal anti-inflammatories, physiotherapy, and a CORTICOSTEROID INJECTION into the FCR tunnel/sheath for refractory symptoms - according to PubMed, conservative measures such as non-steroidal anti-inflammatories and bracing are effective for FCR tendinitis, whereas tendon RUPTURE (e.g. after suspension arthroplasty) requires surgery.
- SURGERY is reserved for symptoms that fail conservative care: release/decompression of the FCR fibro-osseous tunnel with debridement of the diseased tendon (addressing any adjacent STT/TMC arthritis as indicated); and, where the tendon has ruptured, surgical management as appropriate.
- “FCR tendinopathy = VOLAR-RADIAL wrist pain over the FCR where it runs in a tight tunnel against the TRAPEZIAL RIDGE/scaphoid; worse on resisted flexion + radial deviation.
- “Think of the NEIGHBOURS: basal-thumb (trapeziometacarpal) and STT osteoarthritis sit right next to the FCR - and FCR tendinopathy/rupture is a recognised complication of TMC SUSPENSION ARTHROPLASTY.
- “Differential = de Quervain's (dorso-radial, Finkelstein), STT/TMC OA, scaphoid pathology. Non-operative first (splint/NSAIDs/injection); tunnel release/debridement if refractory; surgery for rupture.
Tenderness is over the FCR tendon at/just proximal to the volar-radial wrist crease, worse on resisted flexion and radial deviation - the tendon runs in a tight tunnel against the trapezial ridge/scaphoid.
The FCR sits beside the trapeziometacarpal and STT joints - look for basal-thumb/STT arthritis, and remember FCR tendinopathy/rupture complicates suspension arthroplasty. Exclude de Quervain's and scaphoid pathology.
Anatomy & Presentation
The FCR tendon runs through a tight fibro-osseous tunnel against the trapezial ridge and the scaphoid tuberosity before inserting on the bases of the second (and third) metacarpals. This confined course - immediately adjacent to the trapeziometacarpal and scaphotrapeziotrapezoid (STT) joints - makes it prone to friction tendinopathy and explains its close association with basal-thumb/STT arthritis. It presents with volar-radial wrist pain and tenderness over the tendon at and just proximal to the wrist crease, worse on resisted wrist flexion and radial deviation and on direct palpation; it is usually a degenerative overuse tendinopathy rather than true acute inflammation.
Differential & Workup
| Diagnosis | Where / sign | Discriminator |
|---|---|---|
| FCR tendinopathy | Over the FCR tendon, volar-radial, at the crease | Pain on resisted flexion + radial deviation; tender over FCR |
| De Quervain's | First dorsal compartment, dorso-radial | Positive Finkelstein; APL/EPB tendons |
| TMC (basal-thumb) OA | Base of thumb / CMC joint | Positive grind test; radiographic CMC arthritis |
| STT osteoarthritis | Distal scaphoid / trapezium-trapezoid | Radiographic STT joint narrowing; tender STT |
| Scaphoid pathology | Anatomical snuffbox / scaphoid | Snuffbox tenderness; scaphoid imaging |
Radiographs (including a basal-thumb/STT view) assess the adjacent joints for osteoarthritis; ultrasound or MRI characterises the FCR tendon (tendinopathy, tenosynovitis, partial tear/rupture). A diagnostic injection into the FCR sheath can both confirm the source and treat it.
Management
- Non-operative (first line): activity modification/rest, a wrist (+/- thumb) splint, non-steroidal anti-inflammatories, physiotherapy, and a corticosteroid injection into the FCR tunnel/sheath for refractory symptoms - effective for most FCR tendinitis.
- Treat the neighbours: address coexisting basal-thumb/STT osteoarthritis as indicated.
- Surgery (refractory): release/decompression of the FCR fibro-osseous tunnel with debridement of the diseased tendon.
- Rupture: FCR tendon rupture (e.g. after suspension arthroplasty, or rarely from chronic attrition over the trapezium) requires surgical management rather than conservative care.
Two points keep FCR tendinopathy from being mismanaged. First, the FCR runs right beside the trapeziometacarpal and scaphotrapeziotrapezoid joints, so volar-radial wrist pain attributed to the tendon is frequently driven by - or accompanied by - basal-thumb or STT osteoarthritis; localise the source with examination, radiographs and, if needed, a diagnostic injection, and treat the joint as well as the tendon. Second, FCR tendinopathy and even rupture are recognised complications of trapeziometacarpal suspension arthroplasty (where tissue is wrapped around the FCR), so new or persistent FCR symptoms after basal-thumb surgery should be taken seriously - tendinitis often settles with non-operative care, but a rupture needs surgical management, and the first postoperative year is the critical window for monitoring.
Evidence & Key Studies
Flexor carpi radialis tendinopathy after suspension arthroplasty for trapeziometacarpal arthritis
- After the 'hammock' suspension arthroplasty (wrapping the abductor pollicis longus around the FCR) for trapeziometacarpal arthritis, FCR tendinopathy occurred in a third of hands (tendinitis in 14.3%, rupture in 19.0%).
- Conservative treatment - non-steroidal anti-inflammatories and bracing - was effective for the tendinitis, whereas surgical intervention was required for tendon ruptures.
- Tendon ruptures occurred within six months postoperatively, often after wrist-stressing activities, making the first postoperative year a critical window; manual workers had a higher incidence.
According to PubMed, the occurrence of FCR tendinopathy (and rupture) as a complication of trapeziometacarpal suspension arthroplasty, the effectiveness of conservative treatment (non-steroidal anti-inflammatories and bracing) for the tendinitis, the need for surgery for rupture, and the critical first-postoperative-year window come from the cited Nakai series. The anatomy of the FCR fibro-osseous tunnel against the trapezial ridge, its association with basal-thumb/STT osteoarthritis, and the differential with de Quervain's and scaphoid pathology are standard, well-established teaching. (See also our Basal Thumb (Trapeziometacarpal) Osteoarthritis, De Quervain's Tenosynovitis and Scaphotrapeziotrapezoid (STT) Arthritis topics.)
Clinical Decision Scenarios
Practise clinical reasoning and management decisions out loud
“A patient has volar-radial wrist pain over the FCR tendon. How do you assess and manage it?”
Mnemonics & Memory Aids
FCR
Hook:FCR: Fibro-osseous tunnel (flexion+radial deviation pain), Check the neighbours (TMC/STT OA, arthroplasty complication), Rest first / Release if refractory.
Presentation
- Volar-radial wrist pain over the FCR at/just proximal to the wrist crease
- Worse on resisted wrist flexion and radial deviation; tender over the tendon
- FCR runs in a tight tunnel against the trapezial ridge/scaphoid
Associations & differential
- Basal-thumb (trapeziometacarpal) and STT osteoarthritis (adjacent joints)
- Complication of trapeziometacarpal suspension arthroplasty (tendinopathy/rupture)
- Differential: de Quervain's (dorso-radial, Finkelstein), scaphoid pathology
Management
- Non-operative first: rest/splint, NSAIDs, physiotherapy, FCR-sheath injection
- Treat coexisting basal-thumb/STT arthritis
- Refractory: FCR tunnel release + debridement; rupture = surgery