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Body Mass Index

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NOTE: Values given are estimates for screening purposes only based on height and weight and do not account for age, gender, ethnicity, or activity level. 


What is BMI?
BMI uses height and weight to indirectly estimate body composition.  It is one of most common and cheapest of several tests that can be used as a screen for obesity.  It does not account for muscle mass, gender, or ethnicity, however, and is not recommended as the sole measure of obesity evaluation.

BIG Reasons You Should Lose Weight Before Joint Surgery

1. Fewer Complications After Surgery

According to The American Academy of Orthopaedic Surgeons (AAOS), patients who are obese have “significantly higher rates of complication and hardware failure after total joint arthroplasty (TJA)”. AAOS cites that obesity “affects individual patient care, the healthcare system and nearly every organ in the body.”

Here are some of the specific complications associated with obesity after joint replacement surgery:

  • Infection
  • Poor wound healing
  • Difficulty breathing
  • Blood clots
  • Blood loss
  • Pulmonary embolism (a blood clot in the lungs)
  • May have increased risk of dislocation (especially the hip)

Losing extra weight, even just 5-10% of your body weight can significantly improve your recovery time and outcome, and seriously cut complications.

2. Easier Surgery

Obese patients have more difficult surgeries for numerous reasons. First and foremost, the surgery is more challenging for a surgeon to perform due to lower visibility. Veins are harder to find making it harder to administer necessary medications; anesthesia is harder to administer; breathing is more greatly affected; there tends to be more blood loss; and surgery times are longer. With a longer surgery, patients are under riskier anesthetic for a longer time period and there is more opportunity for complication.

A study by the Mayo Clinic, that looked at spine surgery (not joint surgery) found that obese patients had “increased vasoactive drug requirements during surgery, longer anesthetic and operative times, higher ICU [Intensive Care Unit] admission rates, and increased hospital lengths of stay.”

Shedding extra weight means an easier surgery which directly relates to a more seamless recovery and at-home rehabilitation.

3. Less Pressure on New Joint

This is a crazy statistic: each pound of weight loss offloads 5 to 10 pounds from the knee joint depending on what activity you’re doing. High-impact activities like running can put an excess of 10x your weight on your knees. In other words, if you lose 10 lbs this is like relieving your knee joints of 50-100 lbs of excess pressure on your knee joint. As such, weight loss can alleviate pain from your hip or knee. Although a weight loss probably won’t rule out your need for a replacement, it may make you feel a little more comfortable while you waiting your recovery and ReHab.

. What you can do to improve your BMI and nutrition

Dr. Kenerly has prepared a flier for additional information on the importance of your BMI as well as nutritional insights.  Simply click on the flier (to the right) for a PDF file that you can download and/or print.