The ProSpon silicone MCP/PIP joint replacement is a single-piece flexible implant for replacing the metacarpophalangeal and proximal interphalangeal joints of the fingers. It is supplied in seven sizes and used with a dedicated instrument set that includes trial templates for each size.
Features
- Single cast piece of silicone (NuSil MED-4550).
- Volar flexural groove at the centre of the implant.
- Conical stems of rectangular cross-section, to resist rotation.
- Uncemented.
- Seven sizes (2 to 8), with the size marked on the stem.
- Yellow silicone trial templates in the instrument set.
Indications
Replacement of the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints:
- fixed or stiff joints from progressive polyarthritis, or traumatic or arthritic destruction;
- joint destruction or subluxation on X-ray;
- contracture of the intrinsic muscles of the hand, and swan neck and boutonnière deformities;
- ulnar deviation at the MCP joints that cannot be corrected by soft-tissue (ligament) reconstruction.
Contraindications
Infection, serious neuromuscular or vascular disease, insufficient bone or skin quality, and allergy to silicone. See the surgical technique for precautions.
Indications, contraindications, warnings and precautions are listed in the instructions for use (IFU).
How it works
The flexural zone sits at the centre of the implant, with a groove on the volar (palmar) surface for flexibility. Smooth conical stems of rectangular cross-section extend proximally and distally.
The stems sit loosely in the medullary canals and are not cemented. Their movement along the canal (the piston effect) allows flexion at the flexural zone, and the rectangular section resists rotation.
Instrument set
The implant is used with ProSpon's own instrument set:
- handle with quick-release mechanism;
- four-edged hand rasps for preparing the medullary canals;
- an awl;
- yellow silicone trial templates for the seven sizes, used to choose the size before implantation.
Sizes and ordering
W is the width of the flexural zone and L the overall length.
MCP/PIP joint replacement (cementless)7 items
| Ref. | Size | W | L |
|---|---|---|---|
| Z06110-0200-12035 | 2 | 12 mm | 35 mm |
| Z06110-0300-13043 | 3 | 13 mm | 43 mm |
| Z06110-0400-14049 | 4 | 14 mm | 49 mm |
| Z06110-0500-15055 | 5 | 15 mm | 55 mm |
| Z06110-0600-16062 | 6 | 16 mm | 62 mm |
| Z06110-0700-17068 | 7 | 17 mm | 68 mm |
| Z06110-0800-18075 | 8 | 18 mm | 75 mm |
Codes and sizes are taken from the manufacturer's marketing literature and may change. For current information, check the ProSpon website or the instructions for use before ordering.
Surgical Technique
Product information
What is the implant made of?
Silicone (NuSil MED-4550), cast as a single piece. The surface is smooth, with no coating.
How are the sizes marked?
Seven sizes, 2 to 8, with size 2 the smallest. The size number is marked on the implant stem.
Is it cemented?
No. The stems are placed uncemented in the medullary canals.
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