20/01/2026
Does this look familiar?
This is a Swan Neck Deformity
This is identified by hyperextension at the Proximal Interphalangeal Joint (PIPJ) and flexion of the Distal Interphalangeal Joint (DIPJ).
How it happens:
1️⃣PIPJ laxity/imbalance allows extensor force to dominate at the PIPJ.
This can occur with:
⭐️PIPJ instability
⭐️Volar plate rupture
⭐️FDS (Flexor Digitorum Superficialis) rupture
⭐️TRL(transverse retinacular ligament) rupture
2️⃣ Lateral bands migrate dorsally
3️⃣DIPJ cannot extend fully and stays in flexion posture
👉The untreated mallet deformity can also turn into a swan neck deformity over time.
👉A swan neck posture can be present without an injury - some people with hyper mobile joints have this posture in their fingers due to excess laxity in the PIP.
If you are struggling with a Swan Neck Deformity, you can contact your nearest hand therapist for treatment option or information.
079 491 6450 / 011 475 9480
hands@otzone.co.za