Are symptoms different in the knees vs. hips? 

While the underlying biological process of osteoarthritis involves the same thinning of cartilage and bone changes regardless of the location, the way symptoms manifest in the knees compared to the hips is distinctly different. These differences are primarily driven by the unique anatomy and mechanical roles of each joint; the knee is a complex hinge joint that sits close to the surface, while the hip is a deep ball-and-socket joint encased in thick layers of muscle. Consequently, a person with knee involvement might notice visible swelling and audible clicking, whereas someone with hip changes might experience deep, radiating pain that is often felt in the groin or thigh. Recognising these specific symptom patterns is essential for accurate identification and for choosing the most effective supportive strategies for each area. By understanding whether your discomfort is coming from the mechanical hinge of the knee or the rotational socket of the hip, you can better manage your daily activities and maintain your mobility through targeted care. 

What We’ll Discuss in This Article 

• Key differences in pain location for knee and hip osteoarthritis 

• How visible signs like swelling and bony bumps vary between joints 

• Distinct patterns of stiffness and how they affect daily tasks 

• The difference in audible sensations like grinding and clicking 

• How each condition impacts walking style and overall balance 

• Identifying common triggers that affect the knees and hips differently 

• The importance of differentiating these symptoms from other joint issues 

Distinct pain locations and sensations 

One of the most significant differences between knee and hip osteoarthritis is where the pain is actually felt. In the knee, the pain is usually very localised; you can often point directly to the spot that hurts, such as the inner side of the knee or directly behind the kneecap. The pain often feels like a sharp twinge during movement or a dull ache after a long day of standing. 

In contrast, hip pain is frequently ‘referred’, meaning it is felt in areas away from the actual joint.¹ Most people with hip osteoarthritis feel pain deep in their groin or in the front and side of their thigh. It is also common for hip pain to radiate down toward the knee, leading some people to believe they have a knee problem when the issue is actually in the hip. The NHS notes that hip pain can even be felt in the buttocks or lower back, making it slightly more complex to identify than the localised discomfort of the knee. 

Visible signs and physical changes 

Because the knee joint is located just beneath the skin, physical changes are often much more obvious than in the hip. When the knee is inflamed or irritated, ‘soft’ swelling caused by extra fluid is usually easy to see, often resulting in the loss of the normal bony contours around the kneecap. You might also see ‘hard’ swelling in the form of bony lumps at the edges of the joint. 

The hip joint is situated deep within the pelvis and is covered by the body’s largest muscles, which means that swelling or bony growths (osteophytes) are almost never visible from the outside. Instead of seeing a change in shape, a person with hip osteoarthritis is more likely to notice a change in how they move. For example, they may find it difficult to rotate their leg inward or outward, or they may develop a characteristic limp to avoid putting full weight on the sensitive joint socket. 

Impact on daily mobility and tasks 

The functional impact of osteoarthritis differs based on the specific mechanical demands of the knee and hip. Knee symptoms are often at their worst during activities that involve bending the joint under pressure, such as walking down stairs, kneeling to garden, or getting up from a low chair. You might also experience a sensation of the knee ‘giving way’ due to sudden pain or muscle inhibition. 

Hip symptoms tend to interfere more with activities that require a wide range of motion and rotation. Common difficulties include: 

• Dressing: Struggling to put on socks, tights, or shoes because the hip cannot bend or rotate enough. 

• Entering vehicles: Finding it hard to swing the leg into a car. 

• Cutting toenails: Being unable to reach the feet comfortably. 

• Walking: A feeling of stiffness that makes the first few steps after waking or sitting particularly difficult. 

Clinical guidance from NICE suggests that while both conditions affect walking, hip issues often lead to a more significant reduction in the overall distance a person can comfortably travel. 

Audible sensations and joint noises 

The knee is a notoriously ‘noisy’ joint when affected by osteoarthritis. Crepitus, the grinding, clicking, or popping sensation, is very common in the knee because of the way the kneecap glides through its groove. These sounds can often be heard by others during movements like squats or when walking in a quiet room. 

In the hip, audible noises are much less common. While you might occasionally feel a deep ‘clunk’ or a subtle grinding sensation during certain movements, the hip rarely produces the frequent clicking or ‘sandpaper’ sounds seen in the knee. This is partly due to the depth of the joint and the thick muscle padding that muffles any internal sounds. If you do hear frequent, loud clicking in the hip, it may be related to tendons snapping over the bone rather than the cartilage thinning itself. 

Investigating the causes of different gait patterns 

The way a person walks, their gait, changes differently depending on which joint is affected. Knee osteoarthritis often leads to a ‘stiff-legged’ walk where the person tries to avoid fully bending the knee to reduce pain. Over time, this can lead to the muscles at the back of the leg becoming tight. 

Hip osteoarthritis often results in what is known as a ‘Trendelenburg gait’. Because the muscles around the hip (the gluteals) become inhibited by pain, the pelvis may tilt or drop when walking. This causes the person to lean their upper body over the affected hip to stay balanced. Recognising these specific walking patterns is important for choosing the right strengthening exercises to restore a more natural and efficient movement style. 

Identifying triggers for knee vs. hip pain 

While many triggers are similar, some affect one joint more than the other. Recognising these can help you modify your environment to protect the specific joint involved. 

Typical triggers for these joints include: 

• Knees: Walking on hard surfaces, wearing unsupportive shoes, and prolonged kneeling or squatting. 

• Hips: Sitting in very soft, low sofas for a long time, sleeping on the side without a pillow between the knees, and walking on uneven or sloping ground. 

• Both: Cold and damp weather, which can increase the viscosity of joint fluid and the sensitivity of the joint lining in both locations. 

Differentiation: Joint pain vs. Sciatica 

It is essential to differentiate hip and knee osteoarthritis from neurological issues like sciatica. While hip osteoarthritis causes pain in the groin and thigh, sciatica typically causes a sharp, electric-shock sensation that travels from the lower back, through the buttock, and all the way down the back of the leg to the foot. Sciatica is often accompanied by tingling or numbness, which is not a typical feature of osteoarthritis. If your leg pain is accompanied by sudden weakness in the foot or a loss of bladder or bowel control, you should seek urgent medical evaluation to rule out a serious spinal issue. 

Conclusion 

Although the underlying process of osteoarthritis is the same, the symptoms in the knees and hips differ due to their unique anatomy and roles in the body. Knee symptoms are often localised and visible, characterised by swelling, clicking, and pain during bending movements. Hip symptoms are usually felt deeper in the groin or thigh and primarily impact rotational movements and tasks like dressing. By recognising these specific patterns, individuals can use targeted exercises and supportive aids, such as cushions for the hip or knee-strengthening routines, to manage their condition effectively. Most people find that understanding these differences allows them to better communicate with their healthcare providers and maintain a higher level of daily function and comfort. 

If you experience severe, sudden, or worsening symptoms, call 999 immediately. 

Authority Snapshot 

This article was written by Dr. Stefan Petrov, a UK-trained physician with an MBBS and postgraduate certifications including Basic Life Support (BLS), Advanced Cardiac Life Support (ACLS), and the UK Medical Licensing Assessment (PLAB 1 & 2). He has hands-on experience in general medicine, surgery, anaesthesia, ophthalmology, and emergency care. Dr. Petrov has worked in both hospital wards and intensive care units, performing diagnostic and therapeutic procedures, and has contributed to medical education by creating patient-focused health content and teaching clinical skills to junior doctors.