Lower limb cellulitis associated with ski boot compression trauma

Abstract is not required for Clinical Imagesis not required for Clinical Images (This page in not part of the published article.) International Journal of Case Reports and Images, Vol. 8 No. 7, July 2017. ISSN – [0976-3198] Int J Case Rep Images 2017;8(7):484–486. www.ijcasereportsandimages.com Murphy et al. 484 CASE REPORT OPEN ACCESS Lower limb cellulitis associated with ski boot compression trauma Claire Marie Murphy, Mark Conal Murphy


CLINICAL IMAGE PEER REVIEWED | OPEN ACCESS
deep veins. Antibiotics were changed to clindamycin and vancomycin but clinical improvement was very slow (Figure 3), and although a carrier site screen was negative for methicillin resistant Staphylococcus aureus the antibiotics were escalated to linezolid. He was not  known to have diabetes but he had a body mass index of 40 kg/m 2 , weighed 111 kg and had a high fasting sugar of 8-9 mmol/L with a HbA1c of 46 mmol/mol in keeping with a pre-diabetic state. Magnetic resonance imaging scan revealed edema over the lateral lower leg but no drainable collection. He was discharged 23 days after the initial admission with a C-reactive protein of 17 mg/L and WBC of 8.5x10 3 /L. At follow-up one year later his legs appeared normal on inspection, were not inflamed but on palpation there was a marked temperature difference in a lateral and distal 7x5 cm approximate area just above the ankle joint which was markedly cooler that the rest of the lower legs. Also present was definite edema demonstrated by finger pressure but also restricted to the same cooler lateral area of the calf without any more general or foot edema. Maximum calf diameter was 17 cm.
Unusual in the history was a prolonged compression injury to his calves from over tightened ski boots. He said he felt his lower legs were never normal since an event 20 years previously when he had skied all day in pain, without a break, from boots overtightened by an external screw control mechanism. The boot design was contemporary to 20 years ago and semi rear entry with wiring which could be tightened by an external screw control mechanism. The patient described deliberately overtightening the boots in the hope of achieving better ski control and he had persisted skiing despite considerable pain throughout the day.

DISCUSSION
As there was no clinical lymphoedema evident on presentation, other than a general lower leg swelling, lymphoscintigraphy was not performed although it has been shown that lymphatic abnormalities are commonly present in lower leg cellulitis without clinical signs of edema [1]. Conditions that reduce the circulation of blood in the veins or that reduce circulation of the lymphatic fluid (such as venous insufficiency, obesity, pregnancy, or surgeries) may also increase the risk of developing cellulitis, although different studies have given conflicting risk factors [2,3]. Possible risk factors in this patient were obesity, pre-diabetes, superficial venous insufficiency, dry skin, and a slight ooze from an ingrowing toenail. Halpern et al. in a single centre case control study of 150 cases identified local risk factors to be of prime importance rather than systemic risk factors and also identified blunt injury as a significant risk factor. This patient reported a specific and very clearly remembered painful history of compression trauma with consequent residual abnormal signs in this lateral aspect of his lower leg which have never been described.
Most ski boots are designed to fit a 13-14 inch calf and this patient had a 17 inch calf which may have predisposed him to tight fitting boots [4]. The importance of good fitting ski boots is better recognized today and the skier with wider calves can now be accommodated with boots with lower cuffs and insoles with a heel lift. Also custom liners can be professionally made for a more personal fit and boots can have upper cuff adjustments to fit a wide calf.
Boot top fractures have also been recognized as a risk from overtightened boots and safety release designs but are less common today due to upward as well as rotational binding release design [5,6]. It is likely this sustained compression trauma permanently damaged the superficial venous/lymphatic system leading to the tendency towards recurrent cellulitis. This presentation may have been more serious on this occasion by a prediabetic state which may have further compromised recovery.

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