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Therapeutic Casting in Hand Rehabilitation

Clinical guide · Reviewed by Robyn Midgley, Hand & Upper Extremity Therapist

Casting isn't only for broken bones. Used as a treatment, a well-designed cast can restore motion, calm oedema and even retrain the brain's movement patterns in a stiff hand.

Therapeutic casting is the use of plaster of Paris or other materials to treat joint stiffness, contracture and abnormal movement patterns in the hand, wrist and fingers. Unlike the immobilisation casting used to protect a fracture, therapeutic casting is an active intervention: it restores range of motion, reduces swelling, promotes tissue remodelling and — in some techniques — facilitates motor re-learning through exercise performed inside the cast.

A short history

Therapeutic casting of the hand traces back to the orthopaedic surgeon Paul Brand, who in mid-twentieth-century India developed serial casting to treat contractures in patients with leprosy. Brand established a principle that still guides practice: low-load, prolonged stress is more effective than high-force, short-duration stretching for lasting change in contracted tissue. In 2002, occupational therapist Judy Colditz published the first description of casting motion to mobilise stiffness (CMMS), which broke from tradition by building active motion into the cast rather than relying on static positioning alone.

Serial casting

Serial casting applies a circumferential cast that holds a stiff joint at its maximum comfortable range. The cast is changed every few days, each time repositioning the joint a little further as the tissues elongate. It works through plastic deformation — sustained, low-magnitude tension permanently reorganises the collagen network rather than merely stretching it elastically.

It is most often used for proximal interphalangeal (PIP) joint flexion contractures. Research shows that longer cast-wear intervals (six or more days) tend to outperform shorter ones, because tissue needs sustained positioning to remodel rather than simply rebound. A retrospective study of 49 fingers in patients with rheumatoid and juvenile idiopathic arthritis found a mean reduction in PIP extension loss of nearly 27 degrees.

Casting motion to mobilise stiffness (CMMS)

CMMS, developed by Judy Colditz — a past president of both the American Society of Hand Therapists and the International Federation of Societies for Hand Therapy — takes a different route. A non-removable cast selectively immobilises the proximal joints (typically wrist and knuckles) in a specific therapeutic position, while leaving the distal joints free to move in a chosen direction. The patient performs active flexion within the cast, driving all motion through the unconstrained joints. No passive motion, modalities or manual therapy is applied during the casting phase.

The three principles CMMS integrates

• Tissue remodelling — the cast delivers low-load, prolonged stress to the constrained joints while directing active motion to the free ones, reducing collagen cross-linking and encouraging an elastic tissue response.
• Motor cortex repatterning — by blocking compensatory movement at the proximal joints, the cast forces recruitment of underused muscles (notably flexor digitorum profundus), driving neuroplastic change toward a more normal flexion pattern.
• Oedema reduction — the circumferential cast provides gentle sustained compression while active motion pumps the lymphatic system, helping resolve fibrotic swelling.

Temporary loss of motion in the constrained joints is expected and reverses on weaning. Published applications include hand stiffness after Dupuytren's fasciectomy, crush and degloving injury, and thumb interphalangeal stiffness — and CMMS is particularly valuable for patients who cannot attend frequent therapy sessions, since the cast keeps working between visits.

How casting compares with other approaches

Casting is one of several conservative options alongside dynamic and static-progressive orthoses. Its advantage is total end-range time: tension is maintained across the full 24 hours of wear rather than only while a removable splint is on, and the circumferential design prevents substitution patterns and controls oedema in a way open splints cannot. Serial casting and CMMS are generally reserved for more resistant stiffness where splinting has been insufficient. After the casting phase, orthoses and active mobilisation maintain the gains.

This article is educational and does not replace individual clinical assessment. Casting should be applied by a trained hand therapist.