What is the cause of losing weight after ACL surgery?

Hello,

Welcome to icliniq.com.

I read your query and can understand your concern.

Losing 17 pounds in a month is not typical, even with post-operation recovery and rehabilitation. Since your father has diabetes, a few key things need to be considered:

Possible causes:

1. Infection and Inflammation (e.g., H. pylori): H. pylori can cause gastritis or ulcers, leading to reduced appetite, nausea, or early satiety, which may explain the weight loss. Treatment with antibiotics and acid suppression usually resolves this, but recovery of appetite and weight can take time.

2. Malabsorption or ongoing gastrointestinal dysfunction: Even if the endoscopy looked fine, biopsies are often done to check for chronic gastritis, atrophy, intestinal metaplasia, or even celiac disease—these might not be immediately visible but can cause malabsorption and weight loss.

2. Stress and recovery from surgery: Major surgery, like ACL (anterior cruciate ligament) repair, particularly in an older diabetic patient, increases metabolic demands and may reduce appetite. Pain, sleep disturbances, or rehab-related stress can also contribute.

4. Diabetes-related issues: Poor glycemic control (either high or low sugars) can cause catabolism. Uncontrolled diabetes can lead to unintentional weight loss due to calorie loss in urine (glycosuria) and muscle breakdown.

5. More concerning causes (needs rule-out): Malignancies such as gastric, pancreatic, or colorectal cancers can present with weight loss, and H. pylori is a risk factor for gastric cancer. Chronic infections (e.g., tuberculosis), thyroid disorders, or even hematological diseases like lymphoma may cause rapid weight loss.

Even though the endoscopy looked fine, the doctor may want to:

1. Check for complete blood count for anemia (suggestive of chronic bleeding or malabsorption).
2. Evaluate liver or kidney function, which can be altered in systemic diseases.
3. Measure inflammation markers (e.g., ESR (erythrocyte sedimentation rate), CRP (C-reactive protein).
4. Rule out diabetes-related complications (e.g., HbA1c, thyroid function).
5. Screen for occult malignancy (e.g., tumor markers, complete blood count for lymphoma clues).
6. Nutritional status tests (albumin, vitamin B12, iron studies).

In essence, the doctor is being cautious, which is a good thing.

You do not need to panic, but yes, unexplained significant weight loss deserves thorough investigation. Since your father is diabetic and over 40 years old, it is appropriate to rule out:

Gastrointestinal malignancy (even if early and subtle):

1. Malabsorption syndromes.
2. Systemic disease (thyroid, infections, autoimmune).

So I will recommend:

1. To wait for the pending blood test results, you can ask the doctor what he is thinking.

2. If no clear cause is found and weight loss continues:

• Ask for a CT (computed tomography) scan of the abdomen and pelvis to rule out hidden pathology.

• Consider testing for thyroid dysfunction.

• A stool test for occult blood can also be helpful.

3. Monitor blood sugar closely and make sure his diet is optimized for recovery—consider seeing a diabetic dietitian.

4. If the weight loss persists beyond six weeks with no diagnosis, consult a gastroenterologist or internal medicine specialist for a second opinion.

I hope this information helps you.

Feel free to ask further queries.

Thank you.