A surgical assembly, comprising: a jig comprising a body having a tissue-engaging surface shaped to be received by tissue to be re-orientated by a correction factor (θ), said body defining a plurality of alignment apertures (a), said plurality of alignment apertures (a) being orientated to be parallel with respect to each other on application of said correction factor, wherein said body comprises a first body portion shaped to be received by a first tissue portion of said tissue and a second body portion shaped to be received by a second tissue portion of said tissue, said first body portion being re-orientatable with respect to said second body portion to re-orientate said first tissue portion with respect to said second tissue portion by said correction factor, wherein said first body portion and said second body portion each comprise at least one of said plurality of alignment apertures; and a re-orientation mechanism (d) operable to re-orientate said first body portion with respect to said second body portion to re-orientate said first tissue portion with respect to said second tissue portion by said correction factor comprising an angular displacement about at least one axis and wherein said body comprises a retention portion operable to retain the first body portion with the second body portion until separated, wherein said at least one of said plurality of alignment apertures of said first body portion and said at least one of said plurality of alignment apertures of said second body portion are orientated to be divergent in an uncorrected position prior to application of said correction factor and to be parallel in a corrected position on application of said correction factor. a body having a tissue-engaging surface shaped to be received by tissue to be re-orientated by a correction factor (θ), said body defining a plurality of alignment apertures (a), said plurality of alignment apertures (a) being orientated to be parallel with respect to each other on application of said correction factor, wherein said body comprises a first body portion shaped to be received by a first tissue portion of said tissue and a second body portion shaped to be received by a second tissue portion of said tissue, said first body portion being re-orientatable with respect to said second body portion to re-orientate said first tissue portion with respect to said second tissue portion by said correction factor, wherein said first body portion and said second body portion each comprise at least one of said plurality of alignment apertures; and a re-orientation mechanism (d) operable to re-orientate said first body portion with respect to said second body portion to re-orientate said first tissue portion with respect to said second tissue portion by said correction factor comprising an angular displacement about at least one axis and wherein said body comprises a retention portion operable to retain the first body portion with the second body portion until separated, wherein said at least one of said plurality of alignment apertures of said first body portion and said at least one of said plurality of alignment apertures of said second body portion are orientated to be divergent in an uncorrected position prior to application of said correction factor and to be parallel in a corrected position on application of said correction factor. <EOS>