Table 4.

Cases with modular dual mobility prostheses and distribution of metal and ceramic femoral heads as well as mean postoperative cobalt and chromium ion levels.

Study ID	Cases with modular dual mobility prosthesis	Cobalt-chromium heads	Ceramic heads	Mean cobalt ion levels, mcg/L (range)	Mean chromium ion levels, mcg/L (range)
Matsen Ko et al., 2016	100	99	1	0.70	0.60
Nam et al., 2019	43	14	29	0.16	0.14
Chalmers et al., 2019	17	N/A	17	0.30	0.76
Markel et al., 2019 (HIP International)	49	N/A	49	0.57	0.50
Markel et al., 2019 (Bone and Joint Journal)	39	N/A	39	0.63	0.63
Overall	248	113	135	0.47	0.53