Suture Tension & Wound Dehiscence — 2D Mass-Spring Model

Suture Line Setup

Suture count 8

Suture tension (k_s) 2.0 N/mm

Tissue stiffness (E) 1.0

Tissue tensile limit (σ_max) 3.2 N

Drag any green/amber/red suture marker to tug it by hand. Drag empty space to pan the view; scroll (or pinch) to zoom.

Live Readouts

Dehiscence risk: Safe

Peak suture stress0.00 N

Mean closure gap0.00 mm

Sutures torn0 / 8

How it works

Each suture is a spring pulling the two wound edges together at one point along the incision. The edge itself behaves like an elastic string: neighbouring points are coupled, so tissue stiffness lets the closure "share" load between sutures instead of concentrating it at one bite.

Suture force:  F_i = k_s · gap_i          (gap_i = z_R,i − z_L,i)
Tissue coupling (discrete elastic string), applied to each flap edge:
  a_i += E · (z_{i-1} + z_{i+1} − 2·z_i)
Stress limit:  a suture tears once |F_i| > σ_max,
  after which k_s → 0 for that bite and the gap reopens.

Suture count — more sutures at fixed incision length means shorter unsupported spans, so any strain event is shared across more bites and peak stress per suture drops.
Suture tension (k_s) — how hard each stitch pulls the edges together; higher tension closes the gap faster but raises the force each suture must carry.
Tissue stiffness (E) — resistance of the wound edge itself to bulging between sutures; higher stiffness spreads load more evenly along the line.
Tensile limit — the force a bite of tissue can take before the suture cuts through (tears). Exceeding it visibly reopens that segment — the mechanism behind post-operative wound dehiscence.
Apply strain event — a sudden outward impulse (a cough, a fall, early mobilisation) tests the whole closure at once.
Drag a suture — grab one marker to apply a local, hand-controlled tug instead of a global event, and watch just that bite's stress bar climb in the chart below.

Real-world relevance: surgeons choose suture spacing and material tension precisely to balance this trade-off — too few or too loose and the wound gaps under normal strain; too tight and local tissue ischaemia or suture pull-through become the failure mode instead.

Holding (low stress) Elevated stress Torn / critical