compartments 36 38 to slide off the second fixings 120 126 and hence the second expansion compartments 36 38 detach from the implant 10 with reference to fig9 following detachment of the first and second expansion compartments 32 34 36 38 the contacting components 16 18 of the first contacting member 12 are able to tilt relative to each other and relative to the respective contacting components 20 22 of the second contacting member 14 with reference to fig1 an implant 310 according to an alternative embodiment of the present invention is shown in an insertion configuration the implant 310 has a first contacting member 312 consisting of two contacting components 316 318 linked by a first expandable connection 324 and a second contacting member 314 consisting of two contacting components 320 322 linked by a second expandable connection 326 the first contacting member 312 and the second contacting member 314 are linked by a third expandable connection 328 330 the implant 310 has a first cavity 340 between one contacting component 318 of the first contacting member 310 and one contacting component 322 of the second contacting member 314 in which is housed a second expansion compartment 336 the implant 310 also has a second cavity 342 between the other contacting component 316 of the first contacting member 310 and the other contacting component 320 of the second contacting member 314 in which is housed a further second expansion compartment 338 the implant 310 has a third cavity 344 between the contacting components 320 322 of.