Treating a Torn Knee Meniscus in Seniors with the B-Stitch Arthroscopic Technique

A horizontal meniscus tear is the most common type of tear in the knee, and one of the most challenging to treat. It is characterized by a tear that splits the meniscus into upper and lower layers. In seniors, the tissue is often affected by degenerative changes, including:

• Flattening of the meniscus
• Meniscal extrusion
• Reduced blood supply

A key limitation is that, in patients aged 60 and above, the blood supply to the meniscus is significantly reduced. Repair techniques must therefore carefully preserve existing blood vessels. If the sutures are too tight and compress the blood supply, healing potential is immediately compromised. This differs from younger patients, where tighter suturing can be applied with less impact on circulation. If left untreated, the tear often enlarges over time and may continue to cause persistent knee pain. The torn meniscal fragments can rub against the articular cartilage, eventually leading to knee osteoarthritis.

A - Anatomy
In seniors, the meniscus may become flattened and extruded beyond the joint. Treatment must reposition the extruded meniscus back into the joint to restore proper load distribution.

B - Blood Supply
Suture placement must avoid compressing or constricting the remaining blood supply. The balance of tension and the direction of the sutures are critical.

C - Compression Direction
The compressive force of the sutures must be perpendicular to the tear to ensure proper edge approximation. Selecting a simpler technique with incorrect force direction may compress tissue without improving healing.

B-stitch technique in arthroscopic meniscus repair

Arthroscopic knee surgery uses fine, needle-like instruments, but the key to this technique lies in precise suture placement. The working space inside the knee joint is extremely limited, less than 1 centimeter in height. Needle rotation, suture positioning, and tension control all require a high level of precision.

• Sutures are placed perpendicular to the tear
• Targeted compression is delivered precisely
• The meniscus is repositioned back into the joint
• Suture tension is carefully controlled to preserve blood supply

A successful outcome depends on a properly designed force distribution that ensures balanced load and pressure across the knee during activities such as walking, standing, running and climbing stairs.

After reading an academic article on the B-Stitch technique for arthroscopic meniscus repair by Winyou Ratanachai, M.D., and Emeritus Prof. Charoen Chotigavanich, M.D., published in an international peer-reviewed medical journal, a retired male patient from the United States decided to travel across continents to undergo treatment for a torn meniscus at Samitivej Srinakarin Hospital.

What were the patient’s meniscus tear symptoms prior to treatment?

The patient initially experienced chronic knee pain that persisted for nearly two years. In the early stages he was still able to walk reasonably well, but over time his walking distance decreased significantly. He also experienced occasional knee locking and increasing pain, eventually limiting his mobility to walking around the house. An MRI performed in the United States confirmed a diagnosis of a horizontal meniscus tear; a condition commonly found in seniors.
 

In the early postoperative period, there may be a slight increase in pain as part of the healing response. Surgery is not an instant fix but instead the starting point of a recovery process. Healing of the meniscus in seniors takes time and requires consistent physical therapy.

Approximately 6-7 weeks after surgery:

• Able to bear weight
• Able to walk without assistive devices
• Reduced knee locking
• Improved knee mobility

A meniscus tear is only one aspect of underlying knee problems. Before deciding on surgery, three key factors must be evaluated:

1. Load alignment in the knee joint: In some cases, this can be improved through weight-bearing adjustments and physical therapy.
2. Ligament tension or laxity: Overly tight ligaments can be stretched, while lax ligaments can be supported through muscle strengthening.
3. Type of tear: Some tears do not require surgery, while others require specific surgical techniques.

In this patient, due to severe pain and a significant reduction in walking distance, surgical repair was considered the most appropriate treatment option.

Pain should not be considered a normal part of aging. If you experience any of the following symptoms, a medical evaluation is recommended:

• Knee pain during weight-bearing
• Persistent pain lasting several days after walking
• Knee locking
• Reduced walking distance

Seeking medical attention at an early stage may help prevent the tear from worsening.

Prevention is always better than treating damage after it occurs. Two key principles can help reduce the risk:

1. Control load alignment and weight distribution in the knee joint: Avoid repetitive high-impact stress on the knee.
2. Maintain proper ligament flexibility, especially the posterior structures: Daily activities often involve prolonged knee flexion. Periodically fully extending the knee can help support cartilage nutrition and promote a degree of natural recovery.

1. Can a meniscus tear heal on its own?
   Spontaneous healing is unlikely and carries risks if left untreated. In seniors aged 60 and above, the blood supply to the meniscus is very limited, making natural healing difficult. If left untreated, the tear often enlarges over time and may continue to cause persistent knee pain, and the torn fragments can rub against the articular cartilage, eventually leading to knee osteoarthritis. However, some types of tears may not require surgery and can be managed with proper load adjustment, weight-bearing control, and structured physical therapy.
2. How long does it take to recover from a meniscus tear?
   There is no fixed timeline, as recovery depends on each individual’s healing process. However, general postoperative recovery follows this pattern:
   • Early phase after surgery: the patient will experience a mild increase in pain, which is part of the healing response.
   • Around 6-7 weeks: the patient is able to begin weight-bearing and walking without assistive devices, with reduced knee locking and improved extension.
   • Full recovery: ongoing physical therapy is required, especially in seniors where healing takes longer.