Front Matter

272 Canine Sports Medicine and Rehabilitation

Prosthesis force coupling

Limb force couple

F2a

F2b F1b

F1a

A

A

Socket force couple

Prosthesis

(A) (B) (C)

Figure 11.6 (A) A prosthetic force couple requires the residuum to rotate in opposition to the rotational motion of the
prosthetic socket. Through residuum counter rotation, the patient is able to control the movement of the prosthetic
socket while creating purposeful stance‐phase balance and propulsion while enabling the prosthetic socket to gain
swing‐phase clearance to the ground. (B) Diagram of the isolated force couple noted in (A), demonstrating contact
points in swing phase (further illustrated in Figure 11.7). Refer to (A) for stance phase of gait where forces are neutral.
(C) Diagram of the isolated force couple noted in (A), demonstrating contact points in the terminal or propulsive phase
of gait (further illustrated in Figure 11.7).

Limb force couple

Socket force couple

Prosthesis

Swing phase force coupling

Figure 11.7 The residuum communicates with the
socket in two predicable locations during swing phase.
The distal cranial aspect of the residuum produces the
dominant force creating the force couple.

Limb force couple

Socket force couple

Prosthesis

Stance phase force coupling

Figure 11.8 The residuum communicates with the

socket in two predicable locations during stance phase.

The distal caudal aspect of the residuum produces the

dominant force creating the force couple.