Design

The design des MBW wrist should:

• simplify the complex wrist arrangement which is successively placed in multiple positions,
• maintain and/or restore the function of the natural wrist to the greatest possible extent,
• prevent or minimise the transfer of erring forces (torsion and shear forces).

That requires among other properties:

• a multi-axial manipulation and
• a rolling slide.

The design of the ACAMO-PIP median finger joint endoprosthesis should:

• have the capacity to absorb high torsion forces,
• absorb translation forces and
• allow a good bending capacity (by 90°).

That requires among other properties:

• a diagonal-oval shaft form,
• a rolling slide and
• a forward tilt of the proximal endoprosthetic head.

The design of the MOLANA big-toe base joint endoprosthesis should:

• introduce the least possible leverage force from the dorsal point to the endoprosthetic head,
• achieve good dorsal flexion of 70° (at the intra-operative stage) and
• not obstruct the Os Sesamoideum complex.

That requires among other properties:

• a shift of the joint’s pivot point to the dorsal position,
• a 10° forward tilt of the endoprosthetic head and
• a plantar polished section of the endoprosthetic head.