@Josephine a few more, with existing terms also in there to (hopefully) make it a bit easier to search where the new ones go.
BFI body fat index
BIL brother in law
BMI body mass index
BTHR bilateral total hip replacement; where both hips are replaced in the same operation
BTKR bilateral total knee replacement; where both knees are replaced in the same operation
DD dear daughter
DH dear husband
DILdaughter in law
DS dear son
DW dear wife
ESR erythrocyte sedimentation rate
extension - how straight your knee will go; 0 degrees is dead straight, +5 is bent 5 degrees, -1 is kneecap bends back 1 degree, sometimes called
hyperextension.
FIL father in law
FDA Food and Drug Administration (USA only)
flexion - the amount your knee bends; maximum biologically possible is about 150 degrees (i.e. sitting on your heels)
GA general anaesthetic
Glute gluteus muscle; plainly speaking, your butt muscles
HR hip resurfacing
Hyperextension when your knee will bend (slightly) backwards (see also
extension)
MIL mother in law
Q
Quad Quadricep; the big muscle on the front of your leg above the knee
SIL son in law
THR total hip replacement (see also BTHR)
TJR total joint replacement
TKR total knee replacement (see also BTKR)