Hip and knee replacement are among the most common elective surgical procedures in South Africa and represent one of the clearest examples of how medical aid and gap cover work together — or fail to work together. They are PMB-covered procedures, but the shortfall between what schemes pay and what private orthopaedic surgeons charge is the single most common reason South African patients receive unexpected out-of-pocket bills of R40,000–R130,000.
What Is Hip or Knee Replacement?
Total hip replacement (THR): The arthritic ball-and-socket hip joint is replaced with a prosthetic implant — typically a metal or ceramic femoral head on a metal stem (femur component) and a metal acetabular cup lined with polyethylene. Indicated for severe hip osteoarthritis, hip fracture (in older patients), avascular necrosis, and end-stage inflammatory arthritis.
Total knee replacement (TKR): The damaged knee joint surfaces are replaced with metal and polyethylene components. Indicated for severe knee osteoarthritis, post-traumatic arthritis, and inflammatory arthritis that has failed conservative management.
Partial/unicompartmental knee replacement: Replaces only one compartment of the knee (medial or lateral); smaller surgery, faster recovery. Appropriate in ~15–20% of knee replacement candidates.
Both procedures are highly effective — 90–95% of patients achieve significant pain relief and functional improvement, and implants typically last 15–25+ years.
Is Hip/Knee Replacement a PMB Condition?
Yes. Hip and knee replacement are PMB Diagnosis and Treatment Pairs — your scheme must fund these procedures when clinically indicated. However, PMB means covered at scheme tariff via DSP, which is typically far below what private orthopaedic surgeons charge.
PMB clinical criteria (what your orthopaedic surgeon must document): - End-stage osteoarthritis (or other qualifying diagnosis) on X-ray - Failure of conservative management (NSAIDs, physiotherapy, weight management, intra-articular injections) over an adequate period - Significant functional impairment — pain and limited mobility affecting daily life
Once the clinical criteria are met and the procedure is pre-authorised, your scheme must fund it. The scheme payment goes to a DSP-contracted hospital; the surgeon and anaesthesiologist bill separately.
The Gap Cover Reality — The Most Important Section
This is the financial gap that matters most:
| Cost component | Typical private cost | Scheme pays | Shortfall |
|---|---|---|---|
| Orthopaedic surgeon (hip replacement) | R60,000–R100,000 | R20,000–R35,000 | R25,000–R75,000 |
| Orthopaedic surgeon (knee replacement) | R55,000–R90,000 | R18,000–R30,000 | R25,000–R65,000 |
| Anaesthesiologist | R15,000–R30,000 | R8,000–R15,000 | R7,000–R20,000 |
| Hospital (DSP) | Usually at tariff | Full or near-full | Minimal if DSP |
| Prosthetic implant | R25,000–R80,000 | R20,000–R40,000 (standard) | R5,000–R40,000 for premium |
Total OOP exposure without gap cover: R40,000–R130,000+ per procedure.
Gap cover OPL (~R220,000/year) covers the surgeon and anaesthesiologist shortfalls, bringing OOP to near-zero for the surgical team. The implant gap (standard vs premium) is a separate consideration.
If you are planning joint replacement and do not have gap cover — get it immediately, subject to waiting periods.
Standard vs Premium Implants — What Schemes Fund
Schemes are required to fund a standard prosthetic implant as part of the PMB. They are NOT required to fund premium implants.
Standard implant: Cemented or press-fit conventional polyethylene/metal components. Proven 15–20 year outcomes. Scheme-funded.
Premium implant options (OOP cost): - Highly cross-linked polyethylene (longer-wearing bearing surface) — R5,000–R15,000 extra - Ceramic-on-ceramic or ceramic-on-polyethylene bearing (lower wear debris) — R10,000–R20,000 extra - Patient-specific implants (custom-made from imaging) — R15,000–R30,000 extra - High-flex knee designs — R8,000–R15,000 extra
Your orthopaedic surgeon should clearly explain which components are scheme-funded and which represent an elective upgrade. Insist on a written cost breakdown before surgery.
How Does Medical Aid Cover Hip/Knee Replacement?
| Service | PMB? | Typical cover | Notes |
|---|---|---|---|
| Pre-operative assessment (bloods, ECG, chest X-ray) | Day-to-day | Pathology/radiology benefit | |
| Orthopaedic surgeon consultation | Day-to-day | Day-to-day (shortfall likely) | |
| X-rays / MRI (diagnostic) | Day-to-day | Radiology benefit | |
| In-hospital procedure — surgeon fee | Yes — PMB at tariff | Hospital benefit (PMB) | Gap cover for shortfall above tariff |
| Anaesthesiologist fee | Yes — PMB at tariff | Hospital benefit (PMB) | Gap cover for shortfall above tariff |
| Hospital stay (2–4 days) | Yes — PMB | Hospital benefit | DSP hospital |
| Standard prosthetic implant | Yes — PMB | Hospital/implant benefit | Premium implant upgrade = OOP |
| Post-operative physiotherapy (in-hospital) | Yes — PMB (acute) | Hospital benefit | Typically 2–3 days |
| Post-discharge physiotherapy (outpatient) | No | Day-to-day — limited sessions | 6–12 weeks; critical for outcome |
Day-to-Day Costs: What to Budget For
| With gap cover | With no gap cover |
|---|---|
| Surgeon/anaesthetist shortfall: R0 (gap) | Surgeon/anaesthetist shortfall: R32,000–R95,000 |
| Premium implant upgrade: R5,000–R30,000 OOP | Premium implant upgrade: R5,000–R30,000 OOP |
| Post-discharge physio (beyond scheme sessions): R5,000–R20,000 | Post-discharge physio: R5,000–R20,000 |
| Total with gap cover: R5,000–R50,000 | Total without gap cover: R42,000–R145,000 |
Waiting Period Warning for Switchers
If you are switching medical aid plans and joint replacement surgery is anticipated, waiting periods are critical. Most SA schemes impose a 12-month waiting period for pre-existing conditions on new members (or a 3-month general waiting period). During the waiting period, the scheme will not fund elective surgery for the pre-existing condition.
If you have known hip or knee osteoarthritis and are changing schemes, check the waiting period terms explicitly before switching. Your current scheme remains obligated to fund the procedure during the waiting period at your new scheme.
Key Questions to Ask Your Scheme
- Is my procedure pre-authorised, and what is the authorisation number? Never schedule surgery without written pre-authorisation.
- Which hospital is on your DSP panel for orthopaedic surgery in my area? Confirm both the hospital and the surgeon are DSP.
- What implant is funded under the scheme PMB benefit? Get this in writing from the scheme's case manager.
- Has my gap cover provider been notified? Do this before the admission, not after.
- What are my post-operative physiotherapy sessions? Six to twelve weeks of physio is standard after joint replacement.
Talk to Eldon
Hip and knee replacement are the most common unplanned large out-of-pocket bills in SA private healthcare. The right gap cover eliminates the surgeon and anaesthetist shortfall. The Check shows what each plan on our panel pays for this, side by side, and Eldon advises from there.
Plan ahead for joint replacement cover →