Knee is a hinge joint where the lower leg bone tibia meets the thigh bone femur. During osteoarthritis, cartilage or ligament defects and degenerative arthritis, knee replacement surgery is recommended world-wide to get relief from extreme pain. Knee replacement surgery, also known as knee arthroscopy, is a surgical procedure, in which the affected knee joint is replaced with synthetic material. The most likely candidates for total knee replacement are the patients with severe destruction of the knee joint coupled with progressive pain and impaired function.

Modern technological advances have made computer assisted knee replacement surgery extremely popular around the globe. In this surgery, the surgeon is assisted by a computer to remove the optimum amount and angle of the bone, which otherwise is done by inspecting manually. This is an excellent example of surgery through small incision and it eliminates the chances of human error. A perfect alignment and balance is achieved and hence longevity is also increased to 20 - 30 years. Knee replacement surgery is also specific to gender as the anatomy of male and female patients is different.

There are many types of knee replacements, most common being the total knee replacement or Total Knee Arthroplasty. In addition, there is partial knee replacement, bilateral knee replacement, revision knee replacement and knee arthroscopy.

In knee replacement surgery, the worn out surfaces of joints of knee are replaced with artificial implant of plastic and metal. The lower end of the femur bone is removed and replaced with a metal shell. The upper end of the lower leg bone (tibia) is also removed and replaced with a channelled plastic implant with a metal stem. A plastic ball is also added under the kneecap depending on its condition. These artificial components are commonly referred as prosthesis. The design of these highly flexible implants replicate knee, with the rotating knee replacement implants assist in backward and forward swing of the legs.

Patients whose knee joints have been damaged by either trauma or progressive arthritis should consider total knee replacement surgery. Post-surgical hospital stay after knee joint replacement is usually three to five days. The surgery has a very high success rate and shows dramatic improvement after a month. This improvement is most notable one month or more after surgery. The pain caused by the damaged joint is reduced significantly when the new gliding surface is constructed during surgery. Initially, patient will walk with the help of a walking aid until the knee is able to support full body weight. After six weeks, patient can walk comfortably with minimal assistance. Patients with artificial joints are prescribed to take antibiotics during the course of any elective invasive procedures including dental work. Physiotherapy is an essential part of rehabilitation and it will increase the muscle strength and patient can enjoy most activities, except running and jumping.

Knee Replacement

Most bone fractures mend very easily with proper medical treatment and rest. However, in rare cases, a fracture caused by trauma may not mend even after adequate treatment. When a broken bone fails to heal, it is known as non-union. There are two major reasons for non-union:

  Bone lacks adequate stability

All broken bones require stability to heal. In case of a fracture, doctors place the dislocated bone in its original place and use an external device to hold the broken part in place. Usually, this stability is provided by a splint or cast, but can also be offered by frames and rods as well. However, if the broken bone lacks the required support, it may not set or heal properly, leading to the non-union.

  Fracture lacks proper blood supply

Even with proper stability, a broken bone requires a proper blood supply to start the healing process. The blood carries oxygen and other chemicals that aid in the repair of the bone and makes it crucial during the recovery stage. However, if the blood supply is disrupted, the bone cannot heal and leads to non-union.



Risk factors of non-union:

You are more likely to suffer from non-union if one or more of the following is true in your case-

  People who engage in cigarette smoking and any other form of nicotine addiction have a higher risk of non-unions after a fracture
  Older people can often face non-union, which is why fractures may take longer to heal in these people
  Severe anaemia can often restrict proper blood flow to the broken bone, thus inhibiting the healing procedure
  Similarly, people suffering from diabetes face a greater risk of non-unions
  Lack of proper nutrition may also be blamed for the non-union
  Non-union risks may increase because of side effects from certain medication, such as prednisone, ibuprofen, and aspirin. Consult your doctor in such a case, so that proper precautions can be taken accordingly.

Non-surgical treatment can be used for treating the non-union. Electromagnetic and ultrasound waves are passed through the skin and into the affected bone, in order to treat the non-union. In most cases, this treatment is very effective in curing the fracture. However, if the non-surgical treatment proves ineffective, surgical procedures, such as bone grafts and allograft can be utilized.

Trauma And Nonunion - The Various Risks Involved With It!

Why does PAIN occur? Understand the Mechanism of Pain

Pain is an unpleasant and distressing physical sensation caused by disease or injury, which induces hurt and anxiety in those suffering from it.
There are many different manifestations of pain, ranging from short term (acute pain) to long term (chronic pain). Other classifications include pain in the internal organs (visceral pain), injured tissue (inflammatory pain), nerves (neuropathic pain), etc.

The reason for the occurrence of pain depends on the cause and kind of pain being experienced. In most cases, pain acts as a warning sign that the body has been afflicted by a disorder of some sort, which may have arisen due to internal sickness or external wounding. Acute pains are generally cured on their own through rest or simple medication. Chronic pains, on the other hand, are more complicated in nature and the treatment requires more elaborate diagnosis.

The mechanism of pain

Pain is an extremely personal and subjective experience and affects each individual to varying degrees. The pain signals, which can arise in any part of the body, travel through the spinal cord to the brain along thousands of specialized nerves and nerve fibres. In the brain, it is processed in the centres associated with anxiety, emotions, memory, appetite, etc. Signals and pain inputs are then returned from the brain to the spinal cord, which may heighten or diminish pain.

In some cases, pain may also be induced by damage to the brain and spinal cord, which happens after a stroke.
A constant barrage of pain signals may cause the cells at the end of nerve fibres to become over-sensitized. This is known as 'wind-up' and is one of the most common causes of chronic pain that occurs even though the root of the problem has been identified and treated.

The causes and effects of pain differ from case to case depending on the signals received by the brain and its interpretation. It affects the individual's day to day activities and if persistent, can also have a harmful impact on mental health and psychosis. Pain is always handled, diagnosed and treated differently in all patients by drawing out the best possible solution to the problem.





Why does PAIN occur? Understand the Mechanism of Pain

Knee pain is something that can affect anyone - irrespective of their age. While sometimes it may be of minor importance - and can easily be handled by self-care, often, lingering pain is a manifestation of some other serious underlying problem, such as arthritis. In this case, it is imperative that you consult a doctor and take appropriate measures to combat it.

Causes :

Arthritis: The chief cause of lingering knee pain, arthritis itself can be of a number of types:
 Osteoarthritis, which is a result of deterioration of cartilages due to wear and tear
 Rheumatoid Arthritis, an inflammatory chronic disorder
 Septic Arthritis, causing pain, swelling and redness.
 Gout caused due to the development of uric acid crystals in the joints
Fractures: These are caused by the breaking up of the kneecap due to falls or collisions.
ACL Injuries: Caused due to the tearing of the anterior cruciate ligament (that connects the femur and the shinbone). Especially common in sportspersons such as footballers or basketball players.
Meniscus tears: The meniscus or the rubber-like cartilage (that acts as a shock absorber) can be torn by sudden jerks or excess pressure.

Symptoms:The major symptoms of knee pain include weakness, redness, instability, stiffness or the inability to properly straighten or move the leg. Often, a deformity is also visible, such as a bone sticking out of the leg - in which case it is advisable to consult a doctor immediately.

Possible risks :Factors which include the odds of being inflicted by knee pain and cause serious complications include :
Being overweight: This exponentially increases the stress or pressure that is applied on the knee joints - even in doing mundane tasks like walking up and down stairs.
Excessive physical activity: Some activities, such as sports apply excess stress on the knees as compared to other tasks.
Loss of muscle flexibility: Tightness or weakness in muscles causes increasing number of problems in the knees.

All About Knee Pain

The shoulder is one of the most intricate joints in the body and given that it is subjected to a lot of lifting and movements, there are chances for it to tear or dislocate. The shoulder is a ball-and-socket joint with the socket in the shoulder, and the ball in the upper arm. The joint space between the two bones is surrounded by cartilage, and the space between the two is filled with fluid. Especially in athletes, due to forceful movement, this joint could get dislocated or the cartilage could tear.

The Bankart lesion is when there is a tear of the cartilage in the central anterior shoulder. This causes the cartilage to be damaged, allowing the humeral head to slip down from the socket. When the arm is extended down or to the side, it is commonly dislocated. This can happen posteriorly also, but this movement and so the injury is less likely than an anterior dislocation. If there is also a fracture of the shoulder bone with this dislocation, then it is known as bony or osseous Bankart lesion.

Causes: Bankart lesions can be acute or chronic. Acute is when there is sudden dislocation due to sports activity or accidents. Repetitive use of the shoulder can also lead to chronic Bankart lesions. This is usually seen in sportspersons like swimmers, tennis players, and weightlifters.

Signs and Symptoms:

Pain: The most common symptom with Bankart is shoulder pain that restricts any kind of movement. One may find it difficult pick up things or lifting your hands and in some cases, it is difficult to even sit straight.
Weakness: The shoulder feels weak and one is unable to perform normal activities
Instability: One may lose the grip and strength.
Limited movement: The range of motion of the shoulder may be reduced compared to before the injury.
Crackling: The damage to the fibrous cartilage produces a crackling sound, which can be heard during the movement of the shoulder.
Diagnosis: A combination of symptoms, physical examination, X-ray, and MRI can help in confirming the diagnosis.

The course of treatment depends on the cause and condition of the patient. An exercise regimen is prescribed as the first step in the treatment process. If there is inadequate progress, or if the pain seems to be recurrent, open or closed shoulder surgery may be recommended to include the following:

Arthroscopy (closed surgery) to repair the cartilage damage
Ligament re-attachment
Bone reshaping
Cartilage build up and reshaping
Ligament repair to improve stability
Any of these shoulder surgeries would be followed up with measures to reduce further injury. It is therefore advised to visit a doctor in case of any such discomfort as he/she will be able to find out the severity of the situation and devise a treatment plan accordingly.

Bankart's Lesion - What Exactly Is It?

The shoulder is a complex joint consisting of a number of bones, ball, socket, and cartilage. For people suffering from arthritis of the shoulder joint, a total replacement of the shoulder joint is often a successful procedure. It significantly improves pain and range of motion. However, in case the patient is suffering from a special type of arthritis of the joint known as  cuff tear arthropathy , a total shoulder replacement often does not produce the desired result. These people suffer from large rotator cuff tear as well as arthritis. For such patients, a reverse shoulder arthroplasty often show better results. 

Reverse Shoulder Arthroplasty 

In traditional total shoulder replacement, the device put into the joint consists of a plastic cup fitted into the glenoid bone, also known as the socket, and a metal ball attached to the top of the humerus, the upper arm bone. In a way, it mimics the configuration of the original shoulder joint. However, in case of reverse shoulder arthroplasty, the positions of the metal ball and the socket are interchanged. The plastic cup is attached to the humeral head whereas the metal ball is attached to the glenoid bone. 

Benefits of the Procedure 

A reverse shoulder arthroplasty works better for patients who have a large rotator cuff tear along with arthritis. There are a number of rotator cuff muscles in the shoulder and they help to hold the arm in position as well as provide power to the arm during extreme movements. In case of people with large rotator cuff tear and arthropathy, the upper arm has to rely on different muscles for movement because the rotator cuff muscles don t function. Hence, the arm has to depend on other muscles such as the deltoid muscles, to position and power the arm. This is why a reverse arthroplasty is carried out.

Who Can Undergo This Surgery?

Every patient with cuff tear arthropathy is not a candidate for reverse shoulder arthroplasty. Surgeons recommend this surgery when the patient is suffering from: 

  A total tear of the rotator cuff which cannot be repaired 

  A special type of shoulder arthritis known as cuff tear arthropathy 

  An unsuccessful shoulder replacement surgery 

  Extreme shoulder pain along with difficulty in lifting the arm over the head or away from the body 

  A complex type of fracture in shoulder joint 

  A chronic dislocation of the shoulder 

  A tumor in shoulder joint 

Doctors can also suggest this procedure if the patient had previously tried other remedial measures such as medications, rest, physical therapy, injections, etc., but was not successful in alleviating the pain and improving the range of motion of the shoulder. 

Conclusion 

There are some medications that you need to stop before the surgery since they may cause excessive bleeding after the surgery. Some of these medicines are blood-thinning medicines and Non-steroidal anti-inflammatory medicines.

Revision Replacement - What Should You Know?

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