A nurse assesses an audible grating sound (crepitus) when a client with osteoarthritis moves his knees. What is the cause of this sound?
A.
Popping bursae from standing
B.
A herniated disk in the diseased joint
C.
Pieces of bone and cartilage floating
D.
Years of an autoimmune process
The Correct answer and Explanation is:
The correct answer is C. Pieces of bone and cartilage floating.
Crepitus is a term used to describe the audible grating, cracking, or popping sounds that can occur in joints. In the case of osteoarthritis, this phenomenon is primarily due to the degeneration of cartilage that cushions the joints. As osteoarthritis progresses, the cartilage gradually wears away, leading to increased friction between the bones of the joint.
When a person with osteoarthritis moves their knees, the surfaces of the bones may come into contact with one another, resulting in the sound of crepitus. Additionally, fragments of bone and cartilage can become loose within the joint space. These loose bodies can contribute to the sound as they move with the joint during flexion and extension. This is particularly common in osteoarthritis because the disease often leads to the formation of osteophytes (bone spurs) and the fragmentation of cartilage.
The presence of crepitus in osteoarthritis is not only an auditory symptom but also serves as an indicator of the underlying joint pathology. While crepitus itself is generally not painful, it may accompany other symptoms such as pain, swelling, and stiffness, indicating inflammation and mechanical instability within the joint.
It’s important to note that while other options may seem plausible, they do not accurately represent the mechanism behind the audible sound in this context. For instance, option A suggests popping bursae, which is not typically related to osteoarthritis, and option B regarding a herniated disk is not relevant to knee joint pathology. Option D implies an autoimmune process, which does not directly correlate with the mechanical issues caused by osteoarthritis.
Overall, understanding the cause of crepitus can aid healthcare professionals in assessing the severity of osteoarthritis and determining appropriate treatment strategies for patients experiencing these symptoms.