“Computer-precise correction of even the most complex deformities — through a frame, not open surgery.”
What is a Hexapod External Fixator?
A hexapod external fixator is a circular frame made up of two metal rings connected by six adjustable telescoping struts — a configuration mathematically known as a Stewart platform. The rings are attached to the bone with thin wires and half-pins. By independently lengthening or shortening each of the six struts, the surgeon can gradually correct length, angulation, rotation, and translation in a single device, all calculated by software.
Common hexapod systems include the Taylor Spatial Frame (TSF) and similar 6-axis platforms. Dr. Ashwani Maichand uses the hexapod technique for complex limb-correction problems where a fixed-shape frame would fall short.
Conditions Treated
- Complex post-traumatic deformities — malunion or non-union after fracture.
- Congenital limb deformities (bow legs, knock knees, clubfoot recurrence).
- Limb-length discrepancy requiring lengthening.
- Bone defects after infection or tumour resection.
- Failed previous deformity-correction surgery.
- Joint contractures requiring gradual stretching.
How Hexapod Treatment Works
- Pre-operative imaging: Standing alignment X-rays or EOS scans map the deformity in three planes.
- Frame application: Under anaesthesia, the surgeon attaches two rings to the bone above and below the deformity using thin wires and half-pins.
- Software planning: The deformity is entered into a dedicated planning programme along with measurements of the rings and struts. The software generates a daily strut-adjustment schedule.
- Gradual correction phase: Patients (or family members) turn each strut by a precise amount each day, usually for 2-6 weeks. The bone moves into the correct position at a safe rate of about 1 mm per day.
- Consolidation phase: Once aligned, the frame is locked while new bone hardens. This usually doubles the correction time.
- Frame removal: Done as a short procedure under sedation once X-rays confirm full healing.
Advantages over Traditional Methods
- Six-axis correction in one device — no need to rebuild the frame mid-treatment.
- Computer-guided precision — reduces guesswork and improves outcomes.
- Gradual correction — safer for nerves, vessels, and soft tissues than acute open correction.
- Weight-bearing during treatment — patients keep their limb functional throughout.
- Effective even after failed surgeries where bone stock and soft tissues are compromised.
Living with the Frame
- Daily pin-site cleaning is taught before discharge — takes only minutes.
- Comfortable clothing options are available; most patients adapt within a week.
- Physiotherapy maintains joint mobility while the frame is on.
- Regular review every 2-4 weeks ensures correction is on track.
Why Choose Dr. Ashwani Maichand?
Hexapod treatment is a precision discipline. Dr. Ashwani Maichand has extensive experience with both Ilizarov and hexapod platforms, choosing the right tool for each patient and supporting them through every stage — from frame application to the satisfying day it finally comes off.
For evaluation of complex limb deformities or post-traumatic problems, consult Dr. Ashwani Maichand.