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The Effects of aging process on fracture healing in rat callus
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Sang Ho Song, Young Hee Choi, Shim Chang Gu, Sang Ho Yoo, Young Euy Park
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J Korean Soc Fract 2001;14(2):135-144. Published online April 30, 2001
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DOI: https://doi.org/10.12671/jksf.2001.14.2.135
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 Abstract
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- PURPOSE
Patient age significantly influences the rate of fracture healing. The rate of healing declines with increasing age. The authors compared the aging effect on fracture healing in the callus of rat femur by the light microscopy.
MATERIALS AND METHODS
In this study the unilateral, closed fractures were created in the femur of 18 Sprague-Dawley rats. The rats were killed in three age group(8 weeks:7, 32weeks:6, 70weeks:5) at 2 weeks after fracture. The composition of fracture callus(new bone, cartilage, mesenchymal layer) was measured by image analyzer with H-E stain. Immunohistochemical stain (PCNA, TUNEL, TRAP) positive cells were counted for the comparing of cellular activity according to the aging.
RESULTS
The percent of intramembranous new bone in the younger rat(8 week:22.32%) was higher than the older ones(30 week:7.09%, 70 week:5.37%). The percent of PCNA positive osteoblast in the newbone decreased according to the aging(8 week:64.25%, 30 week:57.40%, 70 week:29.54%). The number of osteoclast in the osteochondral junction at the 8 week(43) was more than that of 30 week(25.57) and 72 week(29.87). The number of TRAP positive osteoclast was not different as aging, but the number of osteoclast in the osteochondral junction(5.89) was more than that in the metapyseal area(2.08).
CONCLUSIONS
More new bone was found in younger rat. There was a strong correlation (p<0.05) between age and PCNA activity. More number of active osteoblast and osteoclast was found in younger rat femoral fracture callus, which indicated rapid fracture healing in younger age.
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Osteochondral Avulsion Fracture in Patella after Treatment of Abscess around Knee: A Case report
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Keun Soo Lee, Geon Woo Lee, Sang Ho Song, Hyun Seo
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J Korean Soc Fract 1999;12(2):290-293. Published online April 30, 1999
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DOI: https://doi.org/10.12671/jksf.1999.12.2.290
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Abstract
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- Osteochondral avulsion fracture of patella has been rarely reported. We experienced one case of osteochondral avulsion fracture which was developed after abscess around knee. The patient was a 16year old with the history of abscess. The presenting symptom was knee pain and loss of extension power. Radiologic and operative findings suggested that osteochondral avulsion fracture of the patella, was caused by minor trauma near the insertion site of quadriceps tendon. In usual case of quadriceps tendon rupture, the rupture occurred at the musculotendinous junction, caused by sudden contracture of the muscle without trauma history. This case was treated successfully with tension band wiring technique. Differential diagnosis between osteochondral avulsion fracture and osteomyelitis of patella was emphasized.
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