In short. Why burn and trauma scars contract across joints, how contracture restricts movement, and how release procedures such as Z-plasty and grafting restore it.
Key points
- Cutting a contracture band simply recreates the original wound, and if nothing is done to the resulting defect it contracts again.
- A proper release therefore opens the band, restores the joint to its full range, and then fills the defect with something that will not re-contract in the same way.
- Options include Z-plasty, which transposes two or more small flaps to lengthen the band; a full-thickness skin graft, which contracts far less than a thin one; a local or regional flap; or, for large areas, a free flap or tissue expansion.
A scar is not dead tissue. It is living tissue that shrinks. As collagen matures and reorganises over the months after an injury, a scar can contract, pulling surrounding tissues toward it. On a flat surface this is merely a change in appearance. Across a joint, such as the neck, the armpit, the elbow, the knee or the fingers, a contracting scar can tether movement, and that becomes a mechanical problem rather than an appearance one.
Why it happens
Contracture is commonest after burns, and after any wound that healed by secondary intention rather than by primary closure or grafting. Thin split-thickness grafts contract more than full-thickness grafts. The process is driven by cells that pull the wound edges together, and by the later reorganisation of collagen that continues for a year or more. A scar that seems acceptable at three months may tighten substantially by twelve.
What contracture does
A contracture band across the front of the neck pulls the chin down. One in the armpit prevents the arm from reaching over the head. One across a finger stops the joint straightening. In children, a contracture can restrict growth of the affected limb as well as movement. A contracture of the lower eyelid after a facial burn pulls the lid away from the eye and can expose the cornea, which is an urgent problem. Contracture can also cause pain, skin breakdown and ulceration at the line of pull.
Release is a reconstruction, not an incision
Cutting a contracture band simply recreates the original wound, and if nothing is done to the resulting defect it contracts again. A proper release therefore opens the band, restores the joint to its full range, and then fills the defect with something that will not re-contract in the same way. Options include Z-plasty, which transposes two or more small flaps to lengthen the band; a full-thickness skin graft, which contracts far less than a thin one; a local or regional flap; or, for large areas, a free flap or tissue expansion. The choice depends on the site, the size of the defect after release, and what tissue is available.
Splinting, therapy and timing
Release surgery is only half the treatment. Postoperative splinting, positioning and stretching hold the gain while the graft or flap settles, and this continues for months. Scar management, including silicone, pressure garments and sometimes laser, reduces the tendency to re-tighten. Timing matters: a scar that is still actively contracting is generally allowed to mature before release is planned, unless function or the eye is at risk.
Honest limits
Contracture can recur, particularly with thin grafts, in growing children, and where therapy is difficult to maintain. Release usually improves range substantially but rarely restores a joint to completely normal. The reconstruction creates its own scars and sometimes needs its own donor site. Results continue to change for a year, and longer in children, and no outcome is guaranteed.
Seek review promptly if
- A lower eyelid is pulled away from the eye, the eye will not close, or there is redness, pain or blurred vision.
- Movement at a joint is progressively lost, or a limb cannot be straightened or fully bent.
- The skin breaks down or ulcerates at the line of a contracture, or a contracture becomes painful and tight.
Frequently asked questions
Why do scars tighten across joints?
A scar is living tissue that shrinks. As collagen matures and reorganises over months, the scar contracts and pulls surrounding tissue toward it. On a flat surface that is only a change in appearance, but across a joint it tethers movement and becomes a mechanical problem rather than a cosmetic one.
Why is a contracture released rather than simply cut?
Because cutting a contracture band recreates the original wound, and if the resulting defect is left alone it contracts again. A proper release opens the band, restores the joint to full range, and fills the defect with something that will not re-contract, such as a Z-plasty, a full-thickness graft or a flap.
Can a contracture come back after release?
Yes, particularly with thin grafts, in growing children, and where therapy is difficult to maintain. Release usually improves range substantially but rarely restores a joint to completely normal, and it creates its own scars. Postoperative splinting and stretching are half the treatment.
Risks & Limitations
- Partial or complete failure of a graft or flap, which may need further surgery.
- Donor-site scarring, delayed healing and pain. A donor site leaves its own permanent scar.
- Infection, bleeding under a graft, or fluid collecting beneath a graft or flap.
- Contracture, and recurrence of contracture after a release procedure.
- Reconstruction is usually staged: more than one operation and months of healing are normal.
- Colour, texture and contour mismatch between reconstructed skin and the surrounding area.
- Reduced or altered sensation in grafts, flaps and donor sites.
- Scars are permanent. They mature and fade but never disappear.
- Final assessment is made at 6–12 months, and longer in growing children.
When to Seek Care
- A graft or flap that turns dark, cold, dusky, purple or black, or stops bleeding when pricked.
- A dressing soaked with blood, or bleeding that does not stop with gentle pressure.
- Fever above 38 °C, or spreading redness, warmth or discharge around a wound.
- New or severe pain, or rapid swelling under a graft or flap in the first days.
- A limb that becomes pale, cold or numb after flap surgery.
- Any change in a grafted or flap-covered area that concerns you, however minor.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — reconstructive surgery and skin graft guidance
- Cochrane Library — systematic reviews in wound care and surgical reconstruction
- Wounds International — wound bed preparation and graft survival guidance
- Chinese Medical Association, Plastic Surgery Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.