Osteoarthritis of the knee is the most common form of knee arthritis. Osteoarthritis is a gradual wearing and degeneration of the joint surfaces or articular cartilage. Osteoarthritis is most common in people who are middle age and adults over the age of 50. Women are more likely to develop osteoarthritis, and it can affect one knee or both. Knee osteoarthritis is the most common cause of disability.

Common causes of knee osteoarthritis include:

  • Genetics and family history can predispose individuals to developing knee osteoarthritis and joint degeneration
  • Ligament or meniscus damage can affect the stability and integrity of the knee joint placing more stress on the joint or articular cartilage. The increased stress and force placed on the joint surfaces can lead to wear and tear on the joint.
  • Repetitive strain injuries to the knee can damage and accelerate wear on joint surfaces
  • Obesity causes increased weight and pressure on the knee joints, when performing everyday activities. This puts added stress on the knees, increasing forces on the joint cartilage.
  • Diseases of the joint cartilage
  • Excessive use of steroids or steroid medication can result in degeneration of the joint and cartilage.
  • Previous trauma to a joint can increase wear and tear and the likelihood of developing knee osteoarthritis.
  • Pain and achiness in the knee joint.
  • Loss of motion during knee extension (straightening) and/or flexion (bending) of the knee. Stiffness may improve with movement.
  • Noticeable swelling around the joint.
  • Increased size or deformity of the joint
  • Weakness may be present making it difficult to get out of chair, squat, kneel, or climb stairs
  • Cracking, crunching or joint noise called crepitus when moving the knee.

Physical Therapists are professionals, educated and trained to administer interventions. As defined by The Guide to Physical Therapist Practice, interventions are the skilled and purposeful use of physical therapy methods and techniques to produce changes consistent with the diagnosis, prognosis and the patient or client’s goals.

Your physical therapist will perform a thorough evaluation to assess and determine the following:

  • Joint: a series of measurements will be performed to determine which joint is involved and the extent to which the inflammation is acute
  • Strength: resisted testing is performed to determine if there is associated weakness or strength imbalances
  • Flexibility: range of motion measurements will be taken to determine if there is reduced joint movement
  • Technique and ADL: the therapist will review what activities you have difficulty with and will help you make modifications in technique to reduce stress on the involved joint.
  • Gait, Balance and Alignment: the therapist will assess your gait and balance on even and uneven surfaces. An assistive device such as a cane or walker may be indicated to improve safety, gait and reduce stress on the effected joint.

Physical therapy for knee osteoarthritis must remain conservative at the onset to avoid aggravating the condition. Emphasis will be placed on rest, reducing the inflammation, protecting the joint and increasing the blood circulation for healing. Once the initial inflammation has reduced, a program of stretching and strengthening will be initiated to restore flexibility and improve strength to reduce stress on knee joint. Taping, bracing or strapping to rest and protect the joint while promoting healing may be indicated.

Common Physical Therapy interventions in the treatment of knee osteoarthritis include:

  • Manual Therapeutic Technique (MTT): hands on care including soft tissue massage, stretching and joint mobilization by a physical therapist to improve alignment, mobility and range of motion of the knee. The use of mobilization techniques also helps to modulate pain.
  • Therapeutic Exercises (TE) including stretching and strengthening exercises to regain range of motion and strengthen muscles of the knee and lower extremity to support, stabilize and decrease the stresses place on joint cartilage and the knee joint.
  • Neuromuscular Reeducation (NMR) to restore stability, retrain the lower extremity and improve movement techniques and mechanics (for example, running, kneeling, squatting and jumping) of the involved lower extremity to reduce stress on the joint surfaces in daily activities. Taping, strapping or bracing may be indicated for joint protection and promote healing. Gait and balance training may be indicated in those that have issues with walking.
  • Modalities including the use of ultrasound, electrical stimulation, ice, cold, laser and others to decrease pain and inflammation of the involved joint.

Avoiding the activities that produce the pain or stress the involved tendon is the first line of treatment.

  • RICE: Rest, Ice, Compression, Elevation should be used to reduce the stress on the bursa.
  • NSAIDS (Non steroidal anti-inflammatory drugs) to reduce pain and inflammation.
  • Immobilization, strapping or bracing may be beneficial to rest, protect the joint and promote healing.
  • Injection of steroids may be indicated to reduce inflammation of the involved joint.
  • Joint injections of hyaluronic acid preparations (synvisc or suparz) to facilitate joint cartilage repair and regeneration.
  • In severe recurrent conditions surgery may be indicated. In less severe cases arthroscopic surgery to clean the joint surfaces (debridement) may be indicated. In cases of severe arthritis or joint degeneration a partial or total knee replacement may be recommended.

Once the pain and inflammation is reduced, and motion and strength are improved it is important that the patient returns to full activity gradually. Instruction in daily activities and a comprehensive home program are helpful for reducing a reoccurrence of flare-ups and slowing the degenerative process. As a preventive measure individuals should:

  • Movement: keep moving and avoid a sedentary lifestyle. Joints are meant to move and depend on movement for lubrication. Sitting and remaining sedentary will reduce the joint’s available range of motion.
  • Stretching: stretching regularly in addition to before and after activity will reduce the chances of developing joint stiffness and pain. Stretching will also improve and maintain the elasticity and flexibility of muscles and tendons of the joint. Hold stretches for 20 seconds and do not bounce. Remember, as joints age flexibility is lost. It is part of the aging process.
  • Strength: performing a regular strength program will keep muscles strong enough to absorb the stresses placed on the joints. Weak muscles allow the stress and forces of every day activities to be transferred to the joint surfaces. Remember, as people get older weakness increases.
  • Protection: Avoid activities that place increased stress on the knees. This includes kneeling, squatting, running or high impact activities.

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