Table 1.
Preoperative stages and types identified for the involved hips (hips, n).
Figure 1.
Schematic diagram of “Light Bulb procedure”: An approximate 1.5 cm×1.5 cm bone window was made at the femoral head–neck junction using osteotomes.
And the necrotized bone located at anterolateral and upper side of the operated femoral head was alternately debrided using a high-speed drill. Then the cavity was filled with an autologous cancellous bone combination of rhBMP-2.
Table 2.
Clinical efficacy between the patients with and without BMP2.
Figure 2.
A 31-year-old patient with ONFH after SARS.
A: Preoperative magnetic resonance image showed ARCO stage IIb/CJFH Type C (the right hip) and ARCO stage IIc/CJFH Type L1 ONFH (the left hip); B: This Computed tomography scan was performed at five years after the impacted bone grafting alone (without addition of BMP2) and showed the femoral head maintained its spherical shape an incomplete repair for the necrosis with the residual lesion at the subchondral bone of the femoral head.
Figure 3.
A 30-year-old patient with ONFH after SARS.
A: Preoperative magnetic resonance image showed ARCO stage IIc/CJFH Type L3 (the right hip) and ARCO stage IIb/CJFH Type C ONFH (the left hip); B: This Computed tomography scan was performed five years after being treated with impacted bone grafting with the addition of rhBMP2 and showed the complete repair of the osteonecrotic region, the amount of sclerotic bone was more improved and the articular surface remains intact without collapse.