Are these pins as the result of a fracture? are they just in the femur (thigh bone) or through the joint? What branch would you apply for?
If its after a fracture and just in the thigh bone, one year must have passed since the pin was fitted, there must be no deformity and you must have full mobility and function of the leg. If this is the case you would be P2 (fit military service)
If it involves the joint of the pelvis and femur, you would be classed as P8 (unfit military service).
This is lifted from the Joint service publication regarding entry medicals. but let me know more gen mate and i'll get back to you with a more accurate answer.