Supporting recovery: thumb MCP joint injuries and the role of thermoplastic splints

Thumb injuries are surprisingly common—especially among athletes, manual workers, and anyone whose daily tasks involve repetitive gripping, pinching, or load-bearing through the hands.

One of the most vulnerable areas? The metacarpophalangeal (MCP) joint of the thumb.

Whether it’s a sprain from sudden trauma (like a fall or awkward catch) or an overuse injury from repetitive strain (think racquet sports, climbing, or even prolonged typing), the thumb MCP joint plays a crucial role in hand function—and when injured, it can seriously impact your ability to work, train, or perform everyday tasks.

Understanding thumb MCP joint sprains and overuse injuries

The MCP joint connects the thumb’s metacarpal bone to its proximal phalanx.

It allows for flexion, extension, and some lateral movement—essential for gripping and stabilising objects. Injuries here often involve:

• Ligament sprains (especially the ulnar collateral ligament)
• Joint inflammation from repetitive stress
• Pain, swelling, and instability during thumb movement
• Reduced grip strength and dexterity

Left untreated, these injuries can linger and worsen, leading to chronic pain or compensatory issues in the wrist and fingers.

The power of a simple thermoplastic splint

One of the most effective early interventions? A custom-moulded thermoplastic splint.

These lightweight, low-profile splints are designed to:

• Immobilise the MCP joint while allowing movement at the wrist and thumb tip
• Reduce strain during work tasks or sport-specific movements
• Protect healing tissues from further damage
• Enable earlier return to activity by offering controlled support

Unlike bulky braces, thermoplastic splints can be tailored to the individual’s anatomy and activity needs.

They’re breathable, durable, and discreet making them ideal for athletes returning to training or workers needing functional hand use without risking re-injury.

Splinting isn’t a substitute for rehab

While splints offer mechanical support, they’re only one piece of the recovery puzzle.

It’s essential to follow up with a qualified physiotherapist who can:

• Assess the severity of the injury
• Guide you through a graded exercise program to restore strength and mobility
• Address any biomechanical issues contributing to overuse
• Monitor progress and adjust treatment as needed

Skipping rehab can lead to stiffness, weakness, or recurrence; so don’t rely on splinting alone.

Getting back to function

Whether you’re gripping a tennis racquet, swinging a hammer, or typing up a report, your thumbs work harder than you think.

A thermoplastic splint can be a game-changer in managing thumb MCP joint injuries, especially when paired with professional guidance and a structured rehab plan.

If you’re dealing with thumb pain or instability, talk to your physiotherapist about whether a splint could support your recovery and help you get back to activity faster!

Pictured is a custom-moulded thermoplastic splint supporting the thumb MCP joint made by Practice Principal Richard Abrugiato.