Untreated Asymptomatic Hips in Patients With Osteonecrosis
of the Femoral Head
- Affiliated Author(s)
- 민병우; 송광순; 조철현; 이경재; 이성문
- Alternative Author(s)
- Min, Byung Woo; Song, Kwang Soon; Cho, Chul Hyun; Lee, Kyung Jae; Lee, Sung Mun
- Journal Title
- Clinical Orthopaedics and Related Research
- Issued Date
- Because there is no consensus regarding the
factors predicting femoral head collapse in asymptomatic
osteonecrosis of the hip, we studied the risk factors for
collapse. Between 1990 and 2000, we used MRI to confirm
asymptomatic osteonecrosis of the femoral head in 81
patients (81 hips) whose other hip had nontraumatic
symptomatic osteonecrosis and we monitored them prospectively.
The minimum followup was 5 years (mean,
8.3 years; range, 5–16 years). At the latest followup, 31
hips (38%) were symptomatic and 26 hips (32%) had
collapsed. The mean interval between diagnosis and collapse
was 4.1 years. We observed no correlation between
femoral head collapse and patients’ age, gender, weight,
presumed cause of osteonecrosis, or length of followup.
With combined factors, only extent of large necrotic lesion
(hazard ratio, 4.06; 95% confidence interval, 1.29–12.77)
and location of Type C2 necrotic lesion (hazard ratio, 6.35;
95% confidence interval, 1.18–34.11) predicted collapse.
Level of Evidence: Level I, prognostic study. See the
Guidelines for Authors for a complete description of levels
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