Causes of Osteoarthritis: Symptoms, Risk Factors, and Treatment Options

Osteoarthritis, also known as degenerative joint disease, is one of the most common joint conditions. It develops when the tissues inside a joint gradually change, including the cartilage that covers the ends of bones and helps them move smoothly. Osteoarthritis may affect the knees, hips, hands, spine, ankles, or other joints.

Osteoarthritis does not affect only older adults. It may also develop in younger people after a joint injury or surgery, because of joint structure, or as a result of repeated loading. Changes seen on an X-ray do not always explain all pain. Diagnosis therefore depends on the symptoms, physical examination, and effect of the problem on movement.

Appropriate movement, muscle strengthening, and reducing excessive joint load may help relieve symptoms and improve daily function. Learn more about Miami Physiotherapy and Rehabilitation Center services, or book an appointment for an osteoarthritis assessment.

What Is Osteoarthritis?

A joint is where two or more bones meet and move together. Cartilage covers the ends of the bones inside the joint and helps reduce friction and absorb some impact.

With osteoarthritis, gradual changes may occur in the cartilage, bone, joint lining, ligaments, tendons, and muscles around the joint. Bone spurs may develop, movement may become limited, and pain or swelling may occur.

The National Institute of Arthritis and Musculoskeletal and Skin Diseases explains that osteoarthritis can affect cartilage, tendons, ligaments, the joint lining, and bone. Pain and reduced movement may also lead to muscle weakness and increased stress on the joint .

Main Causes of Osteoarthritis

Aging

The likelihood of osteoarthritis increases with age because of gradual changes in cartilage, muscles, ligaments, and movement patterns. However, age alone does not determine the severity of osteoarthritis or the amount of pain. Some older adults have mild changes, while a younger person may have clear symptoms because of an injury or another risk factor.

Previous Joint Injuries

An injury to the knee, ankle, hip, or hand may increase the risk of osteoarthritis years later, even when the original injury initially improved. Injuries that can affect a joint include fractures, ligament tears, cartilage injuries, and dislocations.

Returning to sports or strenuous work before rehabilitation is complete may place extra stress on the joint. Appropriate rehabilitation helps restore strength and movement and reduces uneven loading.

Repetitive Use and Excessive Joint Loading

Repeating the same movement, standing for long periods, climbing stairs, squatting, or lifting heavy objects may increase joint stress. This may occur in some athletes and in jobs that require prolonged standing, walking, or lifting.

Repetitive activity does not automatically cause osteoarthritis. However, increasing the load without adequate rest, strengthening, or proper technique may increase the risk of injury or worsen existing symptoms.

Overweight and Obesity

Extra weight increases the mechanical load on weight-bearing joints, particularly the knees, hips, and ankles. Fat tissue may also affect substances involved in inflammation in the body.

When appropriate, losing some weight in a healthy way may reduce joint stress and improve mobility. You do not need to reach an “ideal” weight before beginning suitable exercise or treatment.

Muscle Weakness

The muscles around a joint help stabilize it and absorb part of the load. Weak thigh and hip muscles may increase stress on the knee during walking or stair climbing. Weak hand or shoulder muscles may also make it harder to use a joint safely.

Muscle weakness may develop because of inactivity, pain, or a previous injury. Pain does not always mean that complete rest is the solution. A gradual strengthening program may be more appropriate.

Genetic Factors

Some people have a family tendency to develop osteoarthritis. This does not mean that osteoarthritis is inevitable, but family history may interact with age, weight, injuries, and the way a joint is used.

Joint Structure or Congenital Differences

Some people are born with an unusual bone, joint, or cartilage structure. Joint alignment may also change over time. These factors can distribute pressure unevenly across the joint and increase stress on one area.

Inflammatory Joint Diseases

Conditions such as rheumatoid arthritis or gout may damage a joint and increase the likelihood of secondary osteoarthritis. These conditions differ from typical osteoarthritis and may require specialist medical assessment and treatment.

Not every swollen or warm joint is caused by osteoarthritis. Sudden redness, warmth, and swelling may indicate inflammation or infection and require medical assessment.

Metabolic Conditions

Some metabolic conditions may be associated with joint changes or tissue damage, including diabetes, iron-storage disorders, and other diseases. Having one of these conditions does not mean osteoarthritis is inevitable, but managing overall health helps protect the joints and muscles.

Poor Alignment or Changes in Walking Pattern

Knee alignment problems, a difference in leg length, or changes in the way a person walks may place extra load on one part of a joint. Alignment may also be affected by an injury, surgery, or muscle weakness.

Assessing walking, strength, and movement can help identify factors that may be modified. It does not replace medical assessment when a deformity or severe pain is present.

Is Osteoarthritis Caused Only by Cartilage Wear?

No. Osteoarthritis does not involve cartilage alone. It may also affect bone, the joint lining, tendons, ligaments, and the muscles around the joint. Pain may be influenced by muscle weakness, sensitivity, inflammation, and the way the joint is used, not only by the degree of cartilage change.

For this reason, one person may have clear X-ray changes with limited pain, while another may have more pain despite fewer visible changes. Imaging should be interpreted together with symptoms, examination findings, and movement assessment.

Joints Most Commonly Affected by Osteoarthritis

Knee Osteoarthritis

The knee is commonly affected because it bears body weight and is involved in walking, climbing stairs, sitting, and standing. Pain may occur at the front, inside, or back of the knee, together with stiffness, grinding or creaking, weakness, and difficulty moving.

Read Miami Clinic’s article on knee osteoarthritis and how exercise may reduce pain and improve movement for general information about movement and exercises.

Hip Osteoarthritis

Hip osteoarthritis may cause pain in the upper thigh, groin, pelvis, buttocks, or inner thigh. Pain may increase when walking, climbing stairs, putting on shoes, or moving the leg.

Hip pain can radiate to the knee, so knee pain does not always mean that the problem is inside the knee itself.

Osteoarthritis of the Hands and Fingers

Hand osteoarthritis may cause pain, stiffness, swelling, or changes in the shape of some joints. Opening containers, gripping objects, or writing may become more difficult.

Spinal Osteoarthritis

Osteoarthritis may affect the joints of the neck or lower back and cause pain and stiffness. If there is narrowing around the nerves, symptoms such as numbness or weakness may develop. These symptoms require assessment to identify the cause.

Ankle and Foot Osteoarthritis

Ankle osteoarthritis may develop after an injury, fracture, or repeated sprains. It may cause pain, stiffness, and difficulty walking or climbing stairs. Foot joints may also be affected, particularly after previous injuries or uneven weight-bearing.

Symptoms of Osteoarthritis

Symptoms vary according to the joint and the degree of change. They may include:

• Pain that increases during or after using the joint.

• Stiffness after waking or sitting for a period of time.

• Short-lasting morning stiffness. Longer stiffness may suggest another inflammatory joint condition.

• Swelling or tenderness around the joint.

• Reduced range of motion and flexibility.

• Clicking, grinding, or a rough sensation during movement.

• Weakness in the muscles around the joint.

• A feeling that the joint is unstable or may give way.

• Difficulty walking, climbing stairs, standing, or using the hand.

• Pain during rest or at night in more advanced cases.

Mayo Clinic lists pain during or after movement, stiffness, tenderness, reduced flexibility, a grating sensation, bone spurs, and swelling among the symptoms of osteoarthritis .

The Difference Between Osteoarthritis and Other Types of Arthritis

The term arthritis is sometimes used generally to describe joint pain, but there are many types of arthritis. Osteoarthritis is usually a gradually developing degenerative condition in which pain increases with joint use and stiffness after rest may be short-lasting.

Rheumatoid arthritis and other inflammatory conditions may cause swelling, warmth, prolonged morning stiffness, and symptoms in several joints. The type of arthritis cannot be identified from general symptoms alone, so an examination and blood tests may be needed.

When Should You See a Doctor?

Arrange an assessment if:

• Joint pain or stiffness continues without improvement.

• Pain affects sleep, work, walking, or daily activities.

• Swelling keeps returning or gradually increases.

• Joint movement becomes limited or using the joint becomes difficult.

• Pain follows a previous injury or surgery.

• Weakness or instability develops in the knee or another joint.

• You need pain medication frequently.

• Symptoms occur in several joints.

• You have a strong family history, inflammatory disease, or gout.
  

The NHS guidance on osteoarthritis recommends seeing a healthcare professional when symptoms persist so that the diagnosis can be confirmed and appropriate treatment selected.

When Is Joint Pain an Emergency?

Seek urgent medical assessment if the joint is:

• Suddenly hot, red, and swollen.

• Associated with fever, chills, or severe fatigue.

• Extremely painful after a fall or accident.

• Deformed or unable to move or bear weight.

• Associated with sudden weakness or loss of sensation.

• Severely swollen with unusual, intense pain.

These signs may indicate a fracture, inflammation, infection, or significant injury and should not be treated with home exercises alone.

How Is Osteoarthritis Diagnosed?

Diagnosis begins with questions about the duration and location of pain, movements that increase it, accompanying symptoms, and previous injuries. The doctor or healthcare professional may assess:

• Swelling and tenderness.

• Joint range of motion and flexibility.

• Strength of the muscles around the joint.

• Stability, alignment, and walking pattern.

• Grinding or clicking sounds.

• Ability to perform daily activities.
  

X-rays may show narrowing of the space between bones or bone spurs. MRI may be used in complex cases to assess cartilage and soft tissues. Blood tests or analysis of joint fluid may be requested to rule out rheumatoid arthritis, gout, or infection.

Mayo Clinic explains that osteoarthritis assessment may include a joint examination, X-rays, MRI, blood tests, or joint-fluid analysis depending on the individual case .

Osteoarthritis Treatment

Treatment cannot fully reverse damaged cartilage, but it can reduce pain and improve movement and joint function. The plan depends on the affected joint, symptom severity, and overall health.

Movement and Therapeutic Exercise

Appropriate movement can strengthen muscles, improve flexibility and stability, and reduce stress on the joint. A program may include walking, cycling, water exercise, or targeted strengthening exercises.

Exercises should progress gradually. A small increase in discomfort may occur when starting a new program, but severe pain or persistent swelling means that the plan should be adjusted.

Physiotherapy

Physiotherapy creates a program suited to the patient’s ability and the affected joint. It may include:

• Strengthening the muscles around the joint.

• Exercises to improve range of motion and flexibility.

• Balance and stability training.

• Improving walking and movement technique.

• Training for stairs, sitting, and standing.

• Modifying activities to reduce joint stress.

• Guidance on assistive devices when necessary.

• Monitoring progress and adjusting exercise intensity.

Mayo Clinic explains that a physiotherapist can teach exercises to strengthen the muscles around a joint, increase flexibility, and reduce pain. Regular low-impact exercise may also benefit some patients .

Weight Management When Needed

When extra weight increases the load on the knee, hip, or ankle, losing some weight may reduce pressure and improve movement. Weight loss should be approached in a healthy, sustainable way by adjusting nutrition and increasing activity suitable for the person’s current ability.

Manual Therapy and Supportive Methods

A physiotherapist may use manual therapy or selected supportive methods to reduce pain and improve joint movement as part of a plan that includes exercise. Learn more about manual therapy at Miami Clinic.

Methods such as electrical therapy, ultrasound, or cold therapy may be used when appropriate. No device should be considered a replacement for strengthening and suitable movement.

Medication

A doctor may recommend pain relievers, anti-inflammatory medicines, or topical products depending on the case. Do not use these medicines for prolonged periods without advice, especially if you have an ulcer, kidney or heart disease, or take other medicines.

Topical anti-inflammatory medicines may be suitable for some patients and may have fewer side effects than some oral medicines. The choice depends on the medical history and individual condition.

Injections

A doctor may discuss corticosteroid injections or other injections in selected cases to relieve pain for a period of time. Injections are not suitable for everyone and may carry risks when repeated, so the decision should be made by a doctor.

Surgery and Joint Replacement

Surgery may be considered when there is severe pain or advanced joint damage that does not improve with conservative treatment and significantly affects movement and daily life. Procedures may include bone repair, realignment, or joint replacement, depending on the condition.

An X-ray result alone does not mean that joint replacement is necessary. Do not delay assessment when pain is increasing or significant weakness develops.

Exercises That May Help Osteoarthritis

A physiotherapist chooses exercises according to the affected joint. They may include:

• Range-of-motion exercises for the knee, hip, or shoulder.

• Strengthening the muscles around the joint.

• Balance and stability exercises.

• Gradual walking or cycling.

• Low-impact water exercise.

• Functional movement exercises such as sitting, standing, and stair training.
  

Do not begin intense exercise or heavy weights during severe swelling or acute pain. Stop and seek advice if severe pain, persistent swelling, or instability develops.

Tips to Prevent Osteoarthritis Symptoms from Worsening

• Maintain daily movement appropriate for your ability.

• Increase exercise duration and intensity gradually.

• Avoid staying in the same sitting or standing position for long periods.

• Maintain a healthy weight to reduce joint stress.

• Wear comfortable footwear suitable for the activity.

• Treat injuries early and follow the rehabilitation program.

• Strengthen the muscles around the joint regularly and safely.

• Use assistive devices if recommended by a professional.

• Do not ignore swelling, instability, or recurring pain.

• Ask a doctor before using supplements or medication for a long period.

How Can Miami Clinic Help With Osteoarthritis?

Miami Physiotherapy and Rehabilitation Center can assess and treat many cases of knee osteoarthritis and joint degeneration through physiotherapy programs designed to reduce pain, strengthen the muscles around the joint, improve range of motion and stability, and reduce stress during movement.

The program begins by assessing pain, range of motion, strength, balance, walking pattern, and activities that increase symptoms. Available scans and medical reports may also be reviewed when appropriate. The plan may include therapeutic exercise, functional training, manual therapy, and supportive methods according to each patient’s condition.

The center provides specialized programs for knee and joint osteoarthritis. Services such as electrical therapy, ultrasound therapy, or cold therapy may be considered when appropriate.

Physiotherapy does not restore damaged cartilage to its original state, but it may help control pain, improve movement and daily function, and delay loss of function. When a joint is hot and swollen, an acute injury has occurred, or symptoms require a doctor, medical assessment should come first.

Book an osteoarthritis assessment at Miami Clinic to determine the most appropriate program.

Miami Physiotherapy Center Branches

Choose the closest branch through the Miami Clinic branches page:

Dokki Branch

Address: 70 Mossadak Street, Dokki, opposite Vodafone.
Dokki branch details and booking

Moharam Bek Branch

Address: 72 Moharam Bek Street.
Moharam Bek branch details and booking

Miami Branch

Address: 248 Gamal Abdel Nasser Street, after Gehan Roundabout.
Miami branch details and booking

Kambishzar Branch

Address: 21 El Geish Road, the seaside road, next to Abdel Moneim Gaber Theatre, near El Shatby signal.
Kambishzar branch details and booking

Sheikh Zayed Branch

Address: El Saraya Mall, next to Saudi Market, near Arkan.
Sheikh Zayed branch details and booking

For questions or booking, contact Miami Clinic at 0233362623 or use the contact and booking page. You can also contact the center via WhatsApp.

Frequently Asked Questions About the Causes of Osteoarthritis

What is the most common cause of osteoarthritis?

Osteoarthritis is linked to several factors, including age, previous injuries, repetitive loading, excess weight, muscle weakness, genetics, and certain joint or metabolic diseases. There is no single cause that applies to every patient.

Does osteoarthritis affect only older adults?

No. It may develop in younger people after an injury or surgery, because of joint structure, repetitive loading, or genetic factors. Assessment helps identify the likely cause and the appropriate plan.

Does osteoarthritis mean that the cartilage is completely gone?

Not necessarily. Osteoarthritis has different degrees of severity and may affect cartilage, bone, and the tissues around the joint. The degree of osteoarthritis or treatment need cannot be determined from pain description alone.

Can physiotherapy treat osteoarthritis?

Physiotherapy can help reduce pain, improve movement, strengthen muscles, and improve stability, but it does not restore damaged cartilage to its original condition. The program depends on the affected joint and the severity of symptoms.

Does walking worsen knee osteoarthritis?

Gentle walking that matches your ability may help maintain movement. Reduce the distance or intensity if pain clearly increases or swelling develops. A gradual plan is best created after assessment.

Do I need joint replacement surgery?

Most patients do not need joint replacement. Surgery may be discussed when advanced damage causes severe pain or weakness that affects daily life after appropriate conservative treatment has been tried.

Is an X-ray enough to diagnose osteoarthritis?

No. X-rays can show certain structural changes, but they must be interpreted together with symptoms and examination findings. Imaging changes can occur without pain, and pain may also come from another condition.

When is joint swelling serious?

Sudden swelling with warmth, redness, fever, or severe pain requires urgent medical assessment. The cause may be inflammation, infection, or an injury rather than simple osteoarthritis.

Conclusion

The causes of osteoarthritis include aging, previous joint injuries, repetitive loading, excess weight, muscle weakness, genetics, and some inflammatory or metabolic diseases. Osteoarthritis may affect the knee, hip, hand, spine, ankle, or other joints.

Physiotherapy, suitable exercise, activity management, and reducing joint stress can help relieve symptoms and improve movement. Do not ignore persistent pain, swelling, or instability. Seek urgent assessment when warmth, redness, fever, or a serious injury is present.

Miami Physiotherapy and Rehabilitation Center can assess and treat many cases of knee osteoarthritis and joint degeneration and create a plan that matches the patient’s ability and goals, while referring the patient to a doctor when warning signs are present.

Book an appointment at the nearest Miami Clinic branch and begin with an appropriate assessment.