Table 3.

Intervention characteristics of individual selected studies

Study	THA	HA	Type	Surgical approach	Surgeon’s grade
Baker et al. [14]	Cemented	Cemented	Unipolar	Lateral	Staff and residents
Blomfeldt et a. [15]	Cemented	Cemented	Bipolar	Anterolaterala	Staff
Dorr et al. [29]	Cemented	Cemented or uncemented	Bipolar	Posterior	NS
Keating et al. [25]	Cemented	Cemented	Bipolar	Posterior or lateral	Staff, residents and SHO
Macaulay et al. [16, 26]	Cemented or uncemented	Cemented or uncemented	Uni- or bipolar	Posterolateral or anterolaterala	Staff and fellows
Mouzopoulos et al. [17]	Cemented	NS	NS	NS	NS
Skinner et al. [28]	Cemented	Uncemented	Unipolar	Posterolateral	Registrars and consultants and SHO’s
Van den Bekerom et al. [13]	Cemented	Cemented	Unipolar	Posterolateral, (antero)lateral	Staff and residents

THA total hip arthroplasty, HA hemi arthroplasty, NS Not specified, SHO senior house officers

^a via Modified Hardinge