When both ring locks of a KAFO are engaged, what is the appropriate clearance from the ring locks to the patient's skin?

The appropriate clearance from the ring locks to the patient's skin plays a crucial role in ensuring both comfort and effective function of a Knee-Ankle-Foot Orthosis (KAFO). The correct answer indicates that there should be 6mm clearance medially and 3mm clearance laterally.

This clearance is designed to accommodate movement while preventing skin irritation or pressure sores. The medial clearance is slightly larger to allow for the natural movement dynamics of the knee joint, which tends to be more significant under load and movement. The lateral clearance, while smaller, still provides enough space to avoid pinching and to ensure that the ring lock mechanisms can operate smoothly without compromising the stability of the orthosis.

Maintaining appropriate clearance is crucial, as improper fitting can lead to discomfort and complications such as skin breakdown or reduced effectiveness of the orthotic device. This understanding of fitting principles supports the choice of 6mm medially and 3mm laterally as being optimal for patient safety and device performance.