Hand surgery for GPs: base of thumb arthritis, pyrocarbon discs, and dual-mobility arthroplasty
A Gold Coast hand and wrist surgeon on why carpometacarpal (CMC) thumb arthritis is so functionally costly, how trapeziectomy still works for pain, and why modern dual-mobility thumb arthroplasty is shifting referral timing — plus a simple text-based urgent referral pathway and on-site hand therapy.
- Dr Ken — hand and wrist / microsurgery (surname not confirmed)
- Main speaker. Queensland-trained orthopaedic surgeon with two fellowships in hand and microsurgery. Works with Dave Graham and Dan Williams at a hand clinic Otter hears as “Madraba” (likely Mudgeeraba Hand Clinic), with on-site hand therapists. Do not invent a surname — Otter applause may have heard “Klump,” which is treated as uncertain garble.
- Dave Graham and Dan Williams
- Named colleagues at the same clinic. Dan described as plastic-trained hand surgeon (flaps / microsurgery); Dave with a strong paediatric and microsurgery interest. Together they triage surgeon vs therapy referrals.
- Host / chair (Narelle mentioned as organiser)
- Introduces Ken; closes with applause and Q&A. Audience questions on metacarpophalangeal (MCP) vs CMC arthritis and female predominance.
This is a GP-facing summary of one Gold Coast CPD seminar on Saturday 6 June 2026 (Otter title: “Hand Surgery Presentation”; otter id AydX6cnjC3tbOYvnVFdNEVCBHLg). About 21 minutes (~1259 s). It is not personal medical advice and not a substitute for specialist assessment, imaging reports, or the patient in front of you. Otter.ai garbles clinic names (“Madraba”), implant/company names, and some joint labels. Where the recording is unclear, this write-up cleans the clinical term rather than inventing a surname, dose, rebate figure as a guarantee, or claim not in the talk.
Related write-ups on this network: shoulder-surgery.drkotha.com, foot-and-ankle.drkotha.com, and ortho-urgent-care.drkotha.com — different talks, same GP-facing style.
Team clinic and text referral pathway
Ken opens with apologies (wrong talk prepared; topic swapped overnight to one he loves) and thanks Gold Coast Private and organiser Narelle. He frames the clinic as a team environment across three surgeons plus on-site hand therapy (“Palms” hand therapy heard in Otter) — useful when you are unsure whether the patient needs a surgeon, a therapist, or both at once. They triage and offer the patient one or both in a single referral pathway.
They advertise a text-number referral service that reaches Dave, Dan, or Ken — aimed especially at emergency departments and time-sensitive hand injuries (skateboard / ski / soft-tissue injuries), but also usable when someone walks into general practice with a dramatic hand wound and you want a same-day washout rather than a long public wait. Referral pads with photo-friendly scribble sheets were mentioned for the room.
Disclosure note from the talk: research institute / fellowship arrangements and industry presence (Otter garbles company names; implant sponsors were in the room). Treat commercial disclosure as present; do not treat product names as endorsement by this CPD page.
Why base of thumb arthritis matters
Base of thumb arthritis — the carpometacarpal (CMC) joint at the base of the first metacarpal on the trapezium — is common on X-ray, and roughly 15% of the population is symptomatic. It is the second most common hand arthritis after distal interphalangeal (DIP) joint disease, but often more debilitating: an opposable thumb drives hand function, whereas a sore finger can often be bypassed.
Radiographic staging (simplified from the talk): the joint may widen first before classic arthritis; then arthritis in the CMC joint; then subluxation; grade four involves the top and bottom of the trapezium / scaphotrapezial (ST) joint. Early stages change what operations are realistic.
Stages, splints, and the old pathway
Conservative column on the right of his slide: start with injection, try splints, then consider operations. Splints work well for rest pain — less well when the patient still has to use the hand for work. Elderly patients who mainly want comfort may live in a splint; anyone with a functional job tends to take it off and get the pain anyway.
Historical surgical spectrum he outlined:
- Early disease: pyrocarbon disc as an interposition arthroplasty — partially resect sore surfaces, put something between them so they “can’t feel” each other. Can work well, but the disc can spit out and may not contour like a coin in a joint.
- Gold standard for a long time: trapeziectomy — remove the trapezium and suspend the thumb somehow (many techniques = no perfect answer). Removes painful surfaces; patients often happy because pain settles and the whole hand feels usable again — but grip/dexterity measures may not jump dramatically; thumb shortens; long cast / slow recovery (months to a year to feel settled). Traditionally pushed into the 60s–70s, not young functional workers.
- Younger heavy labourer needing strength: fusion still discussed as the option that preserves power.
A failed trapeziectomy that has sunk too low with ongoing pain is described as a disaster to salvage for the surgeon — limited good options. That asymmetry matters when counselling younger or still-manual patients.
Paradigm shift: pyrocarbon to dual-mobility arthroplasty
The “fun part,” in Ken’s words: putting a hip upside-down in the thumb. Modern implants (several on the market; he describes a fourth-generation dual-mobility construct) use a metal head, a plastic head over that, sitting in a metal cup — dual mobility to allow more motion with lower dislocation risk. Current form around since 2018 in Europe; available in Australia for roughly five years at the time of the talk. Cementless cup and stem; cup positioning in the trapezium is the fiddly X-ray part; the length / linkage of the thumb is preserved.
What the 2023 RCT suggests
Ken highlights a 2023 randomised controlled trial comparing trapeziectomy with modern dual-mobility arthroplasty. Both groups improve and become happy on pain / DASH-type scales, but arthroplasty patients improve faster and do better on range of motion and especially grip, key pinch, and tip pinch — returning closer to pre-arthritis function. Patients often talk only about pain; the harder clinic conversation is explaining arthroplasty risks in exchange for strength and dexterity that trapeziectomy historically under-delivered.
Complications, recovery, and cost context
| Issue mentioned | Clinic note from the talk |
|---|---|
| Trigger thumb / De Quervain’s tenosynovitis | Can occur after arthroplasty; Ken often releases De Quervain’s at the same time (~12% / “one in ten” order of magnitude discussed). |
| Trapezium fracture | Listed as a risk, described as less common than the soft-tissue issues above. |
| Capsule repair | Ken repairs capsule for stability; some European centres close skin only — implant described as inherently stable. |
| Cost / registry | Not fully on the prosthesis registry at talk time; out-of-pocket figures in the roughly $3.5–4.5k per implant ballpark were mentioned as competition between devices — clinic tries insurer/hospital pathways for partial funding. Figures change; verify locally. |
Europe experience cited: ~20 years of related designs; current implant since 2018; large volumes in France and Switzerland (order of 150,000 cited). Revision rates described as approaching hip-arthroplasty-like benchmarks — a metric he likes.
When to refer — and the Lego story
Referral triggers he listed (similar to other arthroplasty conversations):
- Age or disease burden that is limiting life
- Failed splinting
- Weakness or wasting
- Cannot do the job or the things they want to do
Strategic point: if arthroplasty fails, he can still do a trapeziectomy — so younger functional patients (example: carpenter) can try restoration first, with a bailout path. That is why he argues for considering surgery earlier than the old “wait until 60–70 and remove the bone” reflex.
Closing story: patient in late 50s, retired, travels, plays saxophone/guitar and is learning piano. After dual-mobility arthroplasty he holidayed early, then between weeks four and six completed a ~3,000-piece Lego model of Shackleton’s Endurance that had sat unfinished for 3½ years — photo brought to the six-week review. Ken’s counselling point: shortening the thumb and changing strength would have changed keyboard reach and instrument hold — arthroplasty was framed as the option that preserved that life.
Brief Q&A notes
- MCP vs CMC osteoarthritis: MCP arthritis is less common than CMC in pure osteoarthritis; MCP disease is more often post-traumatic or rheumatoid / inflammatory. Pure OA and psoriatic patterns often hit DIP joints; CMC is the classic OA thumb joint.
- Why more women? Saddle joint with high mobility; women have more laxity — propensity discussed as plausible. Also notes that early painful arthritis may later stiffen and hurt less, which can change who presents.
Take-home messages for clinic
- CMC thumb arthritis is common and functionally costly — treat symptomatic disease seriously even when DIP arthritis is more prevalent on X-ray.
- Splints help rest pain; working hands still hurt — refer when function, strength, or vocation is limited.
- Trapeziectomy remains a reliable pain operation but is slow, shortens the thumb, and can leave permanent weakness; failed salvage is hard.
- Modern dual-mobility arthroplasty (and earlier pyrocarbon discs in selected early disease) aims to restore length and pinch faster; 2023 RCT data were presented as a paradigm shift toward earlier reconstruction, especially in younger functional patients who still have trapeziectomy as a bailout.
- Use the team pathway — surgeon + on-site hand therapy triage; text referral for urgent hand injuries across the Coast.
- Cost and registry status change — check current funding locally; figures in the talk were snapshots.
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