Final answer:
After ACL repair, open kinetic chain terminal knee extensions are typically discouraged to protect the healing graft. Closed kinetic chain exercises are preferred in the early stages of rehabilitation to safely build strength and stability. As the knee recovers, gradual reintroduction of open kinetic chain exercises may occur under professional supervision.
Step-by-step explanation:
Open kinetic chain terminal knee extensions are generally not advised following an anterior cruciate ligament (ACL) repair. During ACL rehabilitation, it is crucial to avoid exercises that could impose excessive strain on the graft repair, particularly in the early stages of recovery. An open kinetic chain movement means the foot is not in contact with a solid surface, which in the case of terminal knee extensions could lead to anterior tibial translation. This translation can stress the healing ACL.
Instead, closed kinetic chain exercises are recommended during the initial phases of ACL rehabilitation. These exercises, such as squats and leg presses, involve keeping the foot in contact with a surface, thereby reducing shear forces across the knee joint. This approach helps in safely increasing strength and stability around the knee. As recovery progresses, careful reintroduction of certain open kinetic chain exercises might be possible under the guidance of a trained physiotherapist or rehabilitation professional.