Question

When the thigh is fractured, the patient's leg must be kept under traction. One method of doing so is a variation on the Russell traction apparatus. (See the figure.)
Please place period in place of (dot)
oi53(dot)tinypic(dot)com/2a0b7yx(dot)jpg
If the physical therapist specifies that the traction force directed along the leg must be 21.0 , what must be?
You have not provided a figure, and I have no idea what oi53, 2a0b7yx, etc. are supposed to represent

You have also provided no dimesions for you force numbers.

With respect to your last sentence, what must WHAT be?

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