referring to the drawings a brace 1 is provided which comprises a first engagement means 2 adapted to engage the upper arm above the elbow and a second engagement means 3 adapted to engage or be engageable with part of the forearm below the elbow . the invention herein described will be described with reference to the wrist . of course some reconstruction particularly to the parts of the device which engage the body will be necessary in respect of the alternative body joints , this can be achieved by the use of known techniques . for the purpose of clarity the parts of the brace which enable the first and second engagement means to be held to the body parts are not shown in the drawing , but for example the parts 2 and 3 may have suitable wrap around and cushioning structures as are known in the art , to engage the parts 2 and 3 to the upper and lower arms respectively . extending between the parts 2 and 3 are a pair of members 4 and 5 connected together by pivot 6 . the construction is desirable such that the range of movement of the members 4 and 5 is limited for example by providing stops 7 and 8 and pins 9 and 10 between which physical contact may be made . the pins 9 and 10 may be moved between a number of apertures 11 . such a construction is a known type of arm brace to control movement of the elbow . the position of the engagement means 2 and 3 on the members 4 and 5 may be varied for example by screws or other devices such as 12 engageable into the parts 2 and 3 which are able to be moved in slots such as 13 and be tightenable onto the material of the members 4 and 5 again substantially in the known manner . extending outwardly from the part 3 is an arm 20 which is engaged with a joint 21 . the joint 21 carries a handle or other grip 22 which , where the body joint is a wrist , is able to be gripped by the hand or palm of the user . the part 20 is able to be moved relative to the member 3 , for example by providing the member 20 with a screw thread 23 which engages into a threaded socket , indicated at 24 , in the member 3 . alternatively the member 20 may slide into a recess . in each case the movement is restricted by use of a clamp such as a screw 25 . the end of the member 20 remote from the engagement means 3 carries part of the joint and in the embodiment described this comprises a ball 30 which may be fixed to the member 20 for example by screw 31 passing into a threaded aperture 32 in the end of the member 20 being secured by a counter - sunk aperture 33 in the ball . a bifurcated member 40 is provided which has apertures or depressions 41 and 42 in the arms 43 and 44 of the bifurcated member 40 . the ball 30 sits in the apertures 41 and 42 . this enables the bifurcated member 40 to move relative to the member 20 . this movement is multi - planar and a clamp is provided so that the joint can be clamped into the desired position . in one simple form the clamp may take the form of a bolt 50 passing through an aperture 51 in the member 40 of size such that head 52 of the bolt 50 will not pass through the aperture 51 but so that the distal end 53 of the bolt 50 is positioned in a threaded aperture 54 in member 40 . thus by tightening the bolt 50 the arms 43 and 44 are drawn together thereby clamping the periphery of the apertures 41 and 42 onto the ball 30 . the clearances between the ball 30 and the edges of the apertures 41 and 42 are exaggerated in fig2 for clarity . extending outwardly from the mid point of the back 55 of the member 40 is a threaded rod 56 onto which the hand grip 22 is positioned . the threaded rod 56 engages into a threaded aperture 57 . the construction is such that both the distance from the palm to the elbow and the palm to the wrist is able to be adjusted to meet the size of the individual user . in respect of hand grip 22 this may be achieved by moving the rod 20 in the recess 24 . the member 20 may have a square or rectangular cross - section at the free end thereof which fits into a correspondingly shaped depression in the ball 30 so as to minimise the risk of any relative rotation of these two parts . the joint is offset substantially as shown in the drawings in order to allow free movement and the distance between the palm post 22 and the joint must be anatomically accurate so that the universal joint is at the level of the wrist axis . if the joint is not offset it could dig into the ulna side of the wrist . the clamp will also need to extend a minimal distance beyond the contact point with the ball or rotary motion will be limited . in use the engagement means 2 and 3 are engaged with the arms of a user about the elbow . the palm of the user engages the handle 22 and the wrist is moved into the desired position by rotation of the ball 30 relative to the bifurcated member 40 . when the desired position has been achieved , the clamp , for example the bolt 50 , is tightened until the joint is immobilised therefore substantially immobilising the wrist . should it be desired to alter the relative position of the wrist the clamp may be loosened , the wrist reset and the joint reclamped . thus it can be seen that a brace is provided which has the advantage that a multi - planar joint can be set to a position other than an anatomically neutral position . as previously described this has advantages in allowing a wrist position which is optimal for a specific fracture or soft tissue procedure . similar braces will allow similar advantages for ankle , elbow , shoulder and hip multi - planar joints .