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Letters

Lawnmower neuritis: an unusual occupational hazard

Hu Liang Low and George Stephenson
CMAJ May 10, 2005 172 (10) 1273; DOI: https://doi.org/10.1503/cmaj.1041056
Hu Liang Low
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George Stephenson
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  • © 2005 CMA Media Inc. or its licensors

Meralgia paresthetica is a purely sensory neuropathy caused by irritation or compression of the lateral femoral cutaneous nerve of the thigh, usually at the point where the nerve enters the thigh under the inguinal ligament. The condition is frequently misdiagnosed, and its true incidence may be higher than 4.3 per 10 000 person-years.1 The exact cause of meralgia paresthetica is uncertain, but common contributing causes include obesity, tight clothing around the belt area,2,3,4 pregnancy and trauma. We present a case of meralgia paresthetica related to the patient's occupation.

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Fig. 1: Patient sitting in posture used for operating ride-on lawnmower. The dotted line on the patient's thigh delineates the area of pain, which corresponds to the distribution of the lateral femoral cutaneous nerve.

A 32-year-old gardener presented with a 2-year history of intermittent burning pain along the anterolateral aspect of his left thigh. This problem occurred only when he used a ride-on lawnmower. He had gained weight (to 121 kg), and his broad utility belt dug into his sides whenever he sat on the lawnmower in the posture shown in Fig. 1. His symptoms were triggered and exacerbated whenever he drove over uneven ground. Examination revealed sensory disturbances in the distribution of the lateral femoral cutaneous nerve (Fig. 1 and Fig. 2). Palpation around the left anterior superior iliac spine elicited tingling in the anterolateral thigh. The results of all investigations, including spino-pelvic MRI, were normal. We diagnosed meralgia paresthetica, and treated the patient conservatively.

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Fig. 2: Another view of the patient's thigh showing the distribution of the pain.

Several months later, the patient changed jobs. As a warden, he did not have to use a lawnmower, wore a narrower belt and lost weight. He is now symptom-free.

There are very few reported cases of occupation-associated meralgia paresthetica.3 This case highlights the need to obtain a complete occupational history and to consider the possibility of meralgia paresthetica in patients presenting with thigh pain, as misdiagnosis may lead to unnecessary and inappropriate treatment.5

References

  1. 1.↵
    van Slobbe AM, Bohnen AM, Bernsen RM, Koes BW, Bierma-Zeinstra SM. Incidence rates and determinants in meralgia paresthetica in general practice. J Neurol 2004;251(3):294-7.
    OpenUrlPubMed
  2. 2.↵
    Parmar MS. Hiphuggers' tingly thighs [letter]. CMAJ 2003;168(1):16.
    OpenUrlFREE Full Text
  3. 3.↵
    Kotler D. Meralgia paresthetica. Case report in policewoman. JAAPA 2000;13(10):39-42, 47.
    OpenUrl
  4. 4.↵
    Boulware DR. Backpacking-induced paresthesias. Wilderness Environ Med 2003;14(3):161-6.
    OpenUrlPubMed
  5. 5.↵
    Kallgren MA, Tingle LJ. Meralgia paresthetica mimicking lumbar radiculopathy. Anesth Analg 1993; 76(6):1367-8.
    OpenUrlPubMed
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Canadian Medical Association Journal: 172 (10)
CMAJ
Vol. 172, Issue 10
10 May 2005
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Lawnmower neuritis: an unusual occupational hazard
Hu Liang Low, George Stephenson
CMAJ May 2005, 172 (10) 1273; DOI: 10.1503/cmaj.1041056

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Lawnmower neuritis: an unusual occupational hazard
Hu Liang Low, George Stephenson
CMAJ May 2005, 172 (10) 1273; DOI: 10.1503/cmaj.1041056
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