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China Suppliers HARMONY Tapered Femoral Stem - Optimized Design for Enhanced Performance by Factory
Special Description
Proximal Step-Design
Increases coating surface area to block debris, reducing postoperative loosening.
Stair-step and secondary compressive trabecular alignment.
Effectively prevents femoral stem subsidence.
Biomechanical Load Transmission
Pattern of load transmitting follows Wolff's Law.
Three Coating Options
- 1. Ti (Air Plasma Sprayed)
- 2. Ti (Vacuum Plasma Sprayed)
- 3. Ti+HA (Vacuum Plasma Sprayed)
Porosity: 70%
Thickness: Ti coating: 325 μm, HA coating: 50 μm
- Increase friction with cortical bone for immediate stability
- Good biocompatibility effectively promotes bone growth
Optimized Head-Neck Ratio
Significantly increases range of motion.
● 28mm head → increase 12°
● 32mm head → increase 20°
High Offset Design
Proportional neck length and offset design effectively increase range of motion.
Special Instrumentation
HARMONY™ Stem, Ti (Air Plasma Sprayed)
| Specification | Stem length (mm) | Offset | Neck Angle | Material |
| 09# | 135 | 38 | 130° | Ti6Al4V |
| 10# | 140 | 38 | ||
| 11# | 145 | 40 | ||
| 12# | 150 | 40 | ||
| 13# | 155 | 44 | ||
| 14# | 160 | 44 | ||
| 15# | 165 | 46 | ||
| 16# | 170 | 46 |
HARMONY™ Stem, Ti (Vacuum Plasma Sprayed)
| Specification | Stem length (mm) | Offset | Neck Angle | Material |
| 09# | 134 | 38 | 130° | Ti6Al4V |
| 10# | 140 | 38 | ||
| 11# | 145 | 40 | ||
| 12# | 151 | 40 | ||
| 13# | 156 | 44 | ||
| 14# | 162 | 44 | ||
| 15# | 168 | 46 | ||
| 16# | 173 | 46 | ||
| 17# | 178 | 48 |
HARMONY™ Stem, Ti+HA (Vacuum Plasma Sprayed)
| Specification | Stem length (mm) | Offset | Neck Angle | Material |
| 09# | 134 | 38 | 130° | Ti6Al4V |
| 10# | 140 | 38 | ||
| 11# | 145 | 40 | ||
| 12# | 151 | 40 | ||
| 13# | 156 | 44 | ||
| 14# | 162 | 44 | ||
| 15# | 168 | 46 | ||
| 16# | 173 | 46 | ||
| 17# | 178 | 48 |
Video Demonstration
Technology Education
JUST MED_Surgical Technique Manual_HARMONY Tapered Stem_Cementless.pdf
Download Manual
Frequently Asked Questions (FAQ)
1. Which patients is this hip implant suitable for? +
(1) Patients with Low Soft Tissue Tension: Ideal for individuals with reduced peri-hip soft tissue tension, such as frail elderly female patients.
(2) Extensive Soft Tissue Release Cases: Beneficial for surgeries that involve wide soft tissue release. In these cases, postoperative soft tissue laxity can predispose to dislocation, and adjustments via the femoral head alone may be insufficient (especially when using ceramic heads).
(3) Post-Coxa Vara Correction: In patients undergoing correction of coxa vara, a standard (132° neck-shaft angle) femoral stem might cause limb lengthening; the Harmony design minimizes this risk.
(4) Complex Femoral Anatomy: For patients with trumpet-shaped or champagne cup–shaped femurs, achieving an optimal proximal press-fit may require upsizing the implant, which can lead to limb lengthening—our design helps to balance this challenge.
(5) Developmental Dysplasia of the Hip (DDH): Especially useful in cases with a shallow, small acetabular cavity, where deeper reaming and precise femoral head centralization are necessary.
(6) Femoral Dysplasia: Suitable for patients with a narrow medullary canal and a relatively long femoral neck.
(7) Post-Pelvic Osteotomy Cases: Advantageous for patients with medial displacement of the acetabular rotation center following procedures like pelvic osteotomy.
2. Can patients undergo MRI scans after implantation? +
Yes, the implant is made from non-magnetic materials like titanium, titanium alloys, and cobalt-chromium-molybdenum alloys, ensuring MRI safety. JUST MEDICAL's products meet these standards, but always inform your radiologist before scanning.
3. Does this product support cemented or cementless fixation? +
Designed exclusively for cementless fixation.
Promotes excellent long-term bone growth for stable and durable fixation.
Eliminates the need for bone cement.
4. What coating options are available for the HARMONY™ stem? +
The HARMONY™ system offers three coating alternatives: Ti (Air Plasma Sprayed), Ti (Vacuum Plasma Sprayed), and Ti+HA (Vacuum Plasma Sprayed). With 70% porosity and precise coating thickness (325 μm Ti / 50 μm HA), it ensures high cortical bone friction for primary stability and favorable biocompatibility for bone ingrowth.
5. How does the proximal step-design prevent femoral stem subsidence? +
The proximal step-design utilizes stair-step geometry aligned with secondary compressive trabeculae, following Wolff's Law of load transmission. This increases the contact surface area to block debris and significantly prevents femoral stem subsidence and postoperative loosening.
6. What is the standard neck angle and material used across HARMONY™ stems? +
All HARMONY™ stems are engineered with an anatomical 130° neck angle and fabricated from high-strength Ti6Al4V medical-grade titanium alloy, optimizing joint biomechanics and offset balancing.