Final answer:
The adverse effect that does not result from a wheelchair seat being too high is difficulty positioning knees beneath a table. An elevated seat may even facilitate this process, but can lead to other issues such as pressure sores and poor balance.
Step-by-step explanation:
The question concerns the potential adverse effects of a wheelchair seat being too high. If the seat is too high, one common problem that a user will not face is difficulty positioning knees beneath a table. This is because a higher seat would actually facilitate sliding the knees under a table more easily than a lower seat would. Other issues that may arise from a seat being too high include the risk of pressure sores due to inadequate support of the thighs, or poor balance due to the feet not resting flat on the ground. Furthermore, having a seat too high would not align with optimal ergonomic practices, which aim to minimize strain and maximize support to the body.
It is also important to note that, similar to wearing high heels, an improperly adjusted wheelchair can lead to long-term health consequences like osteoarthritis (OA) in the knee, due to the added stress on the knee joints. Proper ergonomic design is vital, not only for comfort but also for preventing injuries and maintaining good health.