[An original procedure for cement diaphyseal extraction. The segmental cement extraction system or SEG-CES].
OBJECTIVE
We report our first eleven uses of a new cement mantle extraction system. The basis of this technique relies on a cement bone interface with a lower strength compared to the old cement-new cement interface.


METHODS
The first stage of the procedure consists in a specific preparation of the inner surface of the old cement, mantle. It should be clean and dry after being abraded with a stainless steel wire brush. Then a thin cement syringe filled with low Viscosity PMMA cement, is injected in the old mantle in a retrograde fashion. A threaded rod with nuts is centered within the cement sheath to the bottom and held until the injected cement has fully polymerised. Then the threaded rod is unscrewed from the femur; nuts are established along the entire length of the cement column. To prevent trochanteric fracture occurring upon cement extraction, its is important to clear away sufficient bone from the lateral aspect of the canal. A series of extraction rods are then used to sequentially remove the cement mantle. The removal rod is screwed back into the threaded channel at a distance of every one to three nuts, and then attached to the slap hammer via a quick release connection. Cement extraction is performed using deliberate slaps of the slap hammer. The last segment is drilled with the use of a distal plug drill centering sleeve. After having inserted the plug removal rod, the last segment is extracted. We used this technique eleven times in 8 hips for 5 loosening of femoral component and 3 revisions hip arthroplasties without loosening and 2 revisions knee arthroplasties without loosening (an extraction system for the femur and the tibia).


RESULTS
For the 5 loosening cases extraction was easy. In 2 cases, cement mantle was removed as a single "en bloc" piece. In the 3 other cases, the extraction was segmental only in the distal third of the cement mantle. Without loosening, the extraction was completely segmental. In all cases, cement mantles were successfully removed. There was no fracture and no loss of bone stock. There was only one "fissuration" alpha the great trochanter and we only made one distal window. All hip arthroplasties were replaced and arthrodesis were performed after removal of the knee arthroplasties.


CONCLUSIONS
The cement-assisted mantle removal technique appears to be a simple, quick and effective methods for cement mantle removal. Perforation and diaphyseal window can be avoided by the technique even when loosening does not exist. However, it is necessary to establish a thorough preoperating plan in order to eliminate contraindications such as too narrow or too curved sheath.


CONCLUSIONS
It appears that this new procedure will facilitate future reoperations which are reputed to be difficult and dangerous.
Cordonnier
D
D
Service d'Orthopédie-Traumatologie, C.H. Saint-Philibert, Lomme.
Desrousseaux
J F
JF
Polveche
G
G
Rattier
B
B
d'Almeida
M
M
Vinchon
B
B
D001843:Bone Cements; D006622:Hip Prosthesis / Q000009:adverse effects / Q000379:methods; D006801:Humans; D007720:Knee Prosthesis / Q000009:adverse effects / Q000379:methods; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections / Q000601:surgery; D012086:Reoperation
D001843:Bone Cements
Un procédé original d'extraction des gaines cimentées diaphysaires. Le segmental ciment extraction system ou SEG-CES.