Meniscus Insufficiency
What Is Meniscus Insufficiency?
The meniscus is a C-shaped cartilage cushion between the femur and the tibia; it spreads load, absorbs impact and adds stability to the knee. Meniscus insufficiency is when the meniscus can no longer carry out this protective role, because a large part of it has torn or was previously removed.
When the meniscus loses its function, load is concentrated on a small area and the joint cartilage wears faster over time; this means pain, swelling and a rising risk of arthritis in that compartment. For the meniscus injury itself you can review the meniscus tear page, and for other knee problems the knee page.
What Causes It? Risk Factors
Meniscus insufficiency is mostly related to a large or irreparable tear of the meniscus or to removal of a large part of it in a previous operation (meniscectomy). Some factors make the picture worse.
- A previous extensive meniscectomy; a large part of the meniscal tissue is missing.
- Tears in the avascular inner region of the meniscus (the white zone) that are not suitable for repair.
- Root tears, in which the back attachment point of the meniscus detaches and the meniscus loses its function.
- Accompanying problems that increase load on the compartment, such as malalignment and ligament instability.
Symptoms
Symptoms usually concentrate in the compartment of the knee where the meniscus is missing and increase with activity. In some patients the complaints become gradually apparent over years.
- Pain in the affected compartment (inner or outer) that increases with weight-bearing.
- Recurrent swelling and discomfort after activity.
- At times a catching, tight or giving-way sensation.
- Increased complaints after long walking, squatting or stairs.
The Inner and Outer Regions of the Meniscus
The outer third of the meniscus (the red zone) has a rich blood supply, and suitable tears there can be repaired with sutures. The inner two-thirds (the white zone) has no blood vessels; tears in this region usually do not heal on their own or with sutures.
This distinction directly affects the choice of treatment in meniscus insufficiency: where the tissue is suitable for repair, sutures are the priority, while in cases where the tissue is largely lost, a transplant comes onto the agenda in selected patients.
Diagnosis: Examination and Imaging
Diagnosis begins with the history and physical examination; the location of the pain, tenderness at the joint line, the stability of the knee and the alignment are assessed. The extent of previous surgery is asked about.
MRI shows the amount of remaining meniscus, the state of the cartilage and any accompanying ligament injury; an X-ray assesses the alignment and any narrowing of the joint space. These findings determine whether symptom management alone or a surgical option is appropriate. The assessment also clarifies whether the meniscus problem is isolated or occurs together with alignment and ligament problems.
Non-Surgical Treatment
In patients with mild symptoms or who are not suitable for surgery, treatment is managed without surgery. The aim is to reduce pain, share the load by strengthening the muscles around the knee and slow progression. This approach can ease symptoms but does not restore the missing meniscal tissue.
- Activity modification, weight control and a switch to low-impact activities.
- Physiotherapy that strengthens the thigh and hip muscles and, where needed, an orthosis or brace.
- Short-term anti-inflammatory medication under medical advice for pain and swelling; an intra-articular injection in selected cases.
In physiotherapy, strengthening the quadriceps at the front of the thigh and the hip muscles is particularly important; strong muscles can share the load on the knee and reduce symptoms. The programme progresses within the limits of pain and movements that stress the knee, such as deep squatting and sudden twisting, are adjusted in a controlled way.
Surgical Options
Surgery is considered in patients whose symptoms persist and who are suitable candidates. The method is chosen according to the amount of remaining meniscus, the state of the cartilage and any accompanying problems.
- Meniscus repair (suture): in tears suitable for repair, preserving the meniscus is the priority and as much tissue as possible is kept.
- Partial meniscectomy/debridement: only for the torn, catching fragment, removing as little tissue as possible.
- Meniscus transplant: considered in young, active patients whose meniscus is largely missing and whose cartilage is preserved. Accompanying alignment and ligament problems are addressed together.
Recovery and the Long Term
Recovery varies with the treatment used; repair and transplant require a period of restricted weight-bearing and bracing so the tissue can heal. Physiotherapy aims to restore range of motion and muscle strength.
Left untreated, meniscus insufficiency can speed up cartilage wear in the compartment, so follow-up is important. Surgical options, including a transplant, do not reverse existing cartilage damage; their aim is to preserve the function of the knee and reduce symptoms. Where widespread wear develops, knee osteoarthritis treatment is assessed separately.
When Should You See a Doctor?
In a knee whose meniscus is missing, early assessment widens the options while the cartilage is still preserved.
- You have persistent pain and recurrent swelling in the relevant compartment after meniscus surgery.
- Pain that increases with weight-bearing, catching or a sense of instability affects your daily life and sport.
- The knee locks, does not fully straighten and bend, or swells markedly.
For the assessment and treatment of meniscus problems you can contact Assoc. Prof. Serkan Sürücü, and you can also review the other conditions covered within knee surgery.