Table 2.

Data that will be extracted from every study included in the review

No	Description
1	Authors and year of publication
2	Country of origin of the study
3	Type of study
4	Study population
5	Study completion rate
6	Diagnosis
7	Surgical approach: medial parapatellar; modified medial parapatellar according to Insall; subvastus; midvastus; trivector retaining; lateral; lateral with tuberositas osteotomy28
8	Study population demographics
9	Preoperative and postoperative frontal and sagittal plane knee alignment
10	Measurement methods
10a	Isometric/isokinetic strength measurement
10b	Angle of isometric measurement/velocity of isokinetic measurement
10 c	Patient position during the measurement (lying supine/side-lying/standing)
11	Comparators: healthy individuals; asymptomatic contralateral side; no comparator
12	Total duration of follow-up (weeks/months after the operation)
13	Measurement stages (preoperative, follow-up in weeks/months after the operation)
14	Information regarding the rehabilitation protocols
15	Outcome (mean values, standard deviations (SDs) and confidence intervals (CIs))
15a	Absolute values of hip abductor torque in patients after TKA/UKA, or in asymptomatic control groups
15b	Torque ratio (operated side/contralateral hip) of hip abductors in patients after TKA/UKA
15 c	Change in hip abductor torque / hip abductor torque ratio from baseline to each follow-up
15d	Differences in hip abductor torque / torque ratios between patientsafter TKA/UKA and healthy control groups.
16	Authors conclusions
17	Information regarding risk of bias

TKA/UKA, total or unicompartmental knee arthroplasty.