Hip Joint Model vs Shoulder Joint Model: Which Motion Model Earns Bench Space?

If you can buy only one articulated joint model this year, buy the hip. It carries more curriculum weight — gait analysis, hip precautions after arthroplasty, and the movement vocabulary that physiotherapy and orthopaedic courses assess — and it costs very little: the BIX-A1024 is listed at US $14.74 for a natural-size model measuring 21 × 19 × 28 cm on a plastic seat.

Quick facts

Item	BIX-A1024 hip model	Shoulder motion model (typical)
Scale	Natural size	Natural size
Footprint	21 × 19 × 28 cm on a plastic seat	Varies by model; needs circumduction clearance
Movements shown	Flexion, extension, abduction, internal and external rotation	Flexion, extension, abduction, rotation, circumduction
Curriculum weight	Gait, arthroplasty precautions, hip examination	Shoulder girdle, rotator cuff, overhead motion
Listed price	US $14.74	Varies; usually comparable
Bench space	Needs a flat base and ~30 cm clearance	Needs clearance for a full circumduction arc

What the hip model teaches that a shoulder model cannot

The hip is a joint where range of motion is a clinical decision. After total hip arthroplasty, patients are given movement precautions — no flexion beyond 90°, no adduction across the midline, no internal rotation — and those numbers only make sense if a student can see the joint, move it, and watch what the femoral head does against the acetabulum. The A1024 shows exactly those four movements on a plastic seat, which is the position the joint occupies in sitting and in supine examination.

The shoulder teaches a different lesson: it is a mobility joint with a stability trade-off, and its clinical questions are about the rotator cuff and scapular rhythm. Both are worth teaching — but if your programme covers gait, falls, and post-operative hip precautions, the hip model is used weekly while the shoulder model is used in one unit.

Why the seat matters more than it looks

The plastic seat is not packaging; it is pedagogy. A hip model mounted in a sitting position lets an instructor demonstrate the 90° rule directly, and lets students see how the pelvis tilts when the joint flexes. A free-floating joint model is harder to read and easier to drop.

At 21 × 19 × 28 cm, the model fits on a standard skills bench without taking the space a full pelvis or half-skeleton would claim — which is the practical argument for buying several.

The procedural use case: hip arthrocentesis and injection

Joint models increasingly support procedure training, not just anatomy demonstration. A 2021 technique paper describes a 3D-printed hip arthrocentesis model built to train both effusion assessment and ultrasound-guided aspiration [1], and comparative work on arthrocentesis shows that guidance technique affects success — ultrasound-guided approaches outperformed landmark-guided approaches in a study of hip, ankle and wrist procedures [2].

The A1024 is an anatomical model, not a procedure phantom: it does not accept a needle. But it is the right first purchase for the anatomy half of that curriculum — the part where a trainee learns where the joint line sits, how the leg is positioned, and which movement opens the joint space. Buy the procedural phantom second.

Which to buy, in what order

Buy the hip first if: your course includes gait, falls prevention, arthroplasty rehabilitation, or hip examination. The model earns its space in multiple units.

Buy the shoulder first if: your course is upper-limb dominant — sports rehabilitation, shoulder instability, or overhead athlete assessment.

Buy both if: you teach a full musculoskeletal module and have bench space. At this price point, two models cost less than one textbook licence bundle and are used for years.

Procurement notes

1. Confirm the listed size — 21 × 19 × 28 cm natural size; check it against your bench and storage shelf.
2. Check the mount — the plastic seat is part of the product; confirm it is included, not an accessory.
3. Ask about the joint mechanism — screw-and-socket models hold position better than friction joints; ask which type is used.
4. Plan freight — small joints ship cheaply, but minimum order quantities often dominate the cost; combine with other anatomy models.
5. Request a classroom pack — several units plus a storage tray is a normal configuration for skills labs.

FAQ

Q1. What movements does the BIX-A1024 show?

Hip flexion, extension, abduction, and internal and external rotation, as listed on the product page.

Q2. What is the size and price?

Natural size, 21 × 19 × 28 cm, on a plastic seat; listed at US $14.74 per unit.

Q3. Is it suitable for injection training?

No — it is an anatomical motion model, not a procedure phantom. Use a dedicated arthrocentesis trainer for needle practice.

Q4. Can it be used in physiotherapy teaching?

Yes. It supports range-of-motion demonstration, gait-related teaching and post-arthroplasty precaution instruction.

Q5. Hip or shoulder for a nursing programme?

Hip. Nursing curricula deal with falls, mobility and post-operative precautions far more often than overhead shoulder mechanics.

Q6. How do we order or request a sample?

Email chinoncpr@adaanatomy.com with the quantity, your city and whether you need a classroom pack.

References

1. Bøgh AN, et al. A novel three-dimensional-printed ultrasound-guided hip arthrocentesis model. Journal of Ultrasound in Medicine. 2021. PMID 32557791.
2. Wilson SA, et al. Success of ultrasound-guided versus landmark-guided arthrocentesis of hip, ankle, and wrist in a cadaver model. American Journal of Emergency Medicine. 2017. PMID 27810253.

Contact

For the specification sheet, joint mechanism details and a multi-unit quotation: chinoncpr@adaanatomy.com. Production follows ISO 45001 management practice; CE documentation available for EU procurement.