U-Motion II™ Acetabular System

U-Motion II Acetabular System


The newly enhanced U-Motion II™ Acetabular System improves upon a previously proven design, offering more flexible coupling options that reduces risk of dislocation and improves the head-to-neck ratio to help prevent impingement.

These features combine to deliver uncompromising performance, stability and increased range of motion, especially in younger, more active patients.

Includes: Osteoconductive and biocompatible cup HA/Ti coating cups ; XPE liner with snap-in locking mechanism and unique crown tabs design for easy insertion and superb locking strength, choice of screw configurations and screw hole covers.

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Pairing United Orthopedic's UTF Stem Reduced™ hip implant, with the U-Motion II's™ larger head, optimizes the head-to-cup ratio, resulting in greater flexion range, reduced impingement and a wider range of motion. Three screw-hole placement options (including 32° screw angulation) and choice of surface coatings, increase surgical flexibility without compromising cup fixation2. Other notable design features include:

  • 52mm cup accommodates a 36mm head — research shows that a larger head size can help decrease dislocation rate1.
    U-Motion II Acetabular System
  • Optimized head-to-cup ratio — provides better range of motion
    U-Motion II Acetabular System
  • Snap-in locking mechanism — (XPE Liner) smoothly and securely snaps into place to help prevent neck impingement and loosening of the cup.
    U-Motion II Acetabular System
  • Unique crown-tab configuration — 20° XPE linercrown tabs for XPE lip (with laser mark on cup face) facilitate quick, accurate orientation and placement.
    U-Motion II Acetabular System
  • Anti-rotation design — (XPE liner)12 tabs on 0° XPE liner and 10 tabs on 20° XPE liner help prevent rotation and hold the liner-cup assembly in place.
    U-Motion II Acetabular System
  • Thicker XPE liner — designed to increase liner durability and longevity.
    U-Motion II Acetabular System
  • Various surface coatings — and screw hole options.
    U-Motion II Acetabular SystemU-Motion II Acetabular System

Prosthetic Materials and Design

Cup: HA/Ti Plasma spray or Ti Plasma spray coating
Head: CoCrMo or Ceramic by BIOLOX® delta system from
Liner: X-linked PE; 0° or 20°
Accessories: Ti-cancellous screw and metallic screw-hole cover
HA/Ti plasma spray, which has been shown to have osteoconducitve properties3, stimulate bony ongrowth and inhibit migration of wear debris into bone-implant interface4, 5.
Ti plasma spray coating, which when applied to a rough Ti-based surface7, has demonstrated biocompatibility6 and biologic fixation.

1Jameson et al., Lower rates of dislocation with increased femoral head size after primary total hip replacement. A five-year analysis of NHS patient in England. J Bone Joint Surg Br. 2011, 93: 876-880.
2Hsu JT et al., Effects of screw eccentricity on the initial stability of the acetabular cup. Int Orthop. 2010; 31: 451-55.
3Kurashina K et al., Ectopic osteogenesis with biphasic ceramics of hydroxyapatite and tricalcium phosphate in rabbits. Biomaterials. 2002; 23: 407-412.
4Rahbek O et al., Sealing effect of hydroxyapatite coating on peri-implant migration of particles. An experimental study in dogs. J Bone Joint Surg. 2001; 83B: 441-447.
5Rahbek O et al., Superior sealing effect of hydroxyapatite in porous-coated implants. Acta Orthop. 2005; 76: 375-385.
6Long M and Rack HJ., Titanium alloys in total joint replacement- a material science perspective. Biomaterials. 1998; 19: 1621-1639.
7Svehla M et al., The effect of substrate roughness and hydroxyapatite coating thickness on implant shear strength. J Arthroplasty. 2002; 17: 304-311.

Thoughtful, surgeon-friendly design saves operation time under anesthesia by making instrument identification and access quick and easy. MIS and Direct Anterior Approach instruments are available.

  • Supine alignment tower
    U-Motion II Acetabular System
  • Alignment rod
    U-Motion II Acetabular System
  • Universal handle, offset
    U-Motion II Acetabular System
  • Cup reamer handle, offset
    U-Motion II Acetabular System
  • Cup impactor, offset
    U-Motion II Acetabular System

Intended for cementless use, the U-Motion II™ Acetabular System is designed for reduction or relief of pain and/or improved hip function in skeletally mature patients and younger, more active individuals who suffer from:

  • Painful, disabling joint disease of the hip resulting from degenerative arthritis, rheumatoid arthritis, post-traumatic arthritis or late stage avascular necrosis.
  • Revision of previous unsuccessful femoral head replacement, cup arthroplasty or other procedure.
  • Clinical management problems where arthrodesis or alternative reconstructive technique are less likely to achieve satisfactory results.
  • Correction of functional deformity.
  • Treatment of nonunion femoral neck and trochanteric fracture of the proximal femur with head involvement that is unmanageable using other techniques.