A comparative biomechanical study of bionic cannulated screws versus conventional cannulated screws for femoral neck fracture fixation

doi:10.3877/cma.j.issn.2096-0263.2026.02.006

Abstract

Abstract:

Objective

To compare the biomechanical properties of bionic cannulated screws and conventional cannulated screws for the fixation of femoral neck fractures.

Methods

Ten fresh-frozen adult femoral specimens were randomly assigned into an experimental group and a control group, with 5 specimens in each group. The experimental group was fixed with bionic cannulated screws, and the control group with conventional cannulated screws. An intact femur fixation model was first established, followed by a Pauwels type Ⅲ femoral neck fracture model in the same specimen. Under an axial load of 600 N, overall displacement, mean strain in the femoral neck region, and regional strain around the fracture line were measured.

Results

In the intact femur fixation model, the overall displacement on both the anterior and posterior sides was significantly greater in the experimental group than in the control group (P<0.05), whereas no significant difference was found in the mean strain of the femoral neck region between the two groups (P>0.05). In the fracture model, no significant differences were observed between the two groups in overall displacement, mean strain, or regional strain (P>0.05).

Conclusions

Bionic cannulated screws fixation for Pauwels type Ⅲ femoral neck fractures can provide initial stability and create a favorable mechanical environment for subsequent osseointegration.

Key words: Femoral neck fracture, Bionic cannulated screw, Cannulated screw, Biomechanics, Initial stability

Yanjiang Yang, Xiaodong Cheng, Zhongzheng Wang, Yonglong Li, Kai Ding, Yunwei Cui. A comparative biomechanical study of bionic cannulated screws versus conventional cannulated screws for femoral neck fracture fixation[J]. Chinese Journal of Geriatric Orthopaedics and Rehabilitation(Electronic Edition), 2026, 12(02): 99-105.

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Figures/Tables 6

References 27

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组别	例数	愈合状态		骨折状态
组别	例数	前侧面（mm）	后侧面（mm）	前侧面（mm）	后侧面（mm）
传统空心螺钉组	5	0.57±0.21	0.40±0.17	0.98±0.41	0.91±0.39
仿生空心螺钉组	5	0.96±0.32	0.77±0.32	1.14±0.54	1.16±0.61
t值		2.527	2.508	0.560	0.158
P值		0.030	0.031	0.588	0.878

组别	例数	愈合状态		骨折状态
组别	例数	前侧面（mm）	后侧面（mm）	前侧面（mm）	后侧面（mm）
传统空心螺钉组	5	0.57±0.21	0.40±0.17	0.98±0.41	0.91±0.39
仿生空心螺钉组	5	0.96±0.32	0.77±0.32	1.14±0.54	1.16±0.61
t值		2.527	2.508	0.560	0.158
P值		0.030	0.031	0.588	0.878

组别	例数	愈合状态（μm/m）		骨折状态（μm/m）
组别	例数	前侧面	后侧面	前侧面	后侧面
传统空心螺钉组	5	759.45±312.52	732.43±364.55	1 006.35±475.34	943.44±369.49
仿生空心螺钉组	5	833.43±389.45	809.08±386.31	1 025.37±436.66	990.26±394.33
t值		0.363	0.354	0.074	1.356
P值		0.724	0.731	0.943	0.212

组别	例数	愈合状态（μm/m）		骨折状态（μm/m）
组别	例数	前侧面	后侧面	前侧面	后侧面
传统空心螺钉组	5	759.45±312.52	732.43±364.55	1 006.35±475.34	943.44±369.49
仿生空心螺钉组	5	833.43±389.45	809.08±386.31	1 025.37±436.66	990.26±394.33
t值		0.363	0.354	0.074	1.356
P值		0.724	0.731	0.943	0.212

组别	例数	前侧面（μm/m）
组别	例数	区域1	区域2	区域3	区域4
传统空心螺钉组	5	1272.90±644.87	1336.95±602.43	486.72±253.66	233.50±116.55
仿生空心螺钉组	5	1317.23±671.63	1407.51±528.85	690.71±355.98	372.84±184.01
t值		0.117	0.216	1.143	1.567
P值		0.909	0.834	0.280	0.148
组别	例数	后侧面（μm/m）
组别	例数	区域1	区域2	区域3	区域4
传统空心螺钉组	5	612.03±339.25	505.06±260.24	471.82±218.52	285.43±134.77
仿生空心螺钉组	5	726.67±328.34	573.34±282.84	437.20±202.39	200.46±100.61
t值		0.595	0.435	0.285	1.238
P值		0.565	0.673	0.782	0.244

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